Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Vol. 50 Issue 21

1 November 2012

Volume 50, Issue 21

Pages i–iv, 4369–4588

  1. Cover Image

    1. Top of page
    2. Cover Image
    3. Highlight
    4. Rapid Communication
    5. Articles
    1. You have free access to this content
      Cover Image, Volume 50, Issue 21 (pages i–ii)

      Article first published online: 27 SEP 2012 | DOI: 10.1002/pola.26383

      Thumbnail image of graphical abstract

      Electronic coupling via the cardo structure in polyfluorene is investigated by Hyeonuk Yeo, Kazuo Tanaka, and Yoshiki Chujo on page 4433. The electronic states of the main chain of polyfluorene can be preserved from the introduction of electronic withdrawing and/or donating groups by the cardo structure. Pure blue emissions can be obtained from these polymers. Moreover, this preservation effect by the cardo structure is perceived even in the film state after annealing. These results suggest the possibility that the cardo polyfluorene is promising as a scaffold for assembling functional molecules based on preprogrammed positions to obtain desired functions.

    2. You have free access to this content
      Inside Cover, Volume 50, Issue 21 (pages iii–iv)

      Article first published online: 27 SEP 2012 | DOI: 10.1002/pola.26384

      Thumbnail image of graphical abstract

      An easy encapsulation technique of carbon nanotubes within a polymer sheath of tunable thickness is presented on page 4403 by Weiheng Zhong, Jules Nguendia Zeuna, and Jerome P. Claverie. The image shows various single-wall and multi-wall carbon nanotubes encapsulated in a polystyrene or poly(methyl methacrylate) layer. This method, which does not require any covalent modification of the carbon nanotube, or any organic solvent, could easily be implemented on a large scale. It is expected that the encapsulated nanotubes exhibit greater compatibility with polymeric matrices, thus facilitating the preparation of nanotube-polymer nanocomposites.

  2. Highlight

    1. Top of page
    2. Cover Image
    3. Highlight
    4. Rapid Communication
    5. Articles
    1. You have free access to this content
      New polymer-chemical developments in clinical dental polymer materials: Enamel–dentin adhesives and restorative composites (pages 4369–4402)

      Norbert Moszner and Thomas Hirt

      Article first published online: 6 AUG 2012 | DOI: 10.1002/pola.26260

      Thumbnail image of graphical abstract

      Nowadays, durable esthetic direct resin-based filling composites in combination with efficient enamel-dentin adhesives play an important role in modern dentistry. Thereby, the surface of the cavity is etched and primed with a self-etching enamel-dentin adhesive. After filling the cavity with the composite and photocuring (see picture), a highly esthetic tooth shaded composite restoration is created. The article describes the continuous improvement of the properties of the direct restorative materials by the use of new tailor-made functionalized monomers and cross-linkers as well as new additives and photoinitiators.

  3. Rapid Communication

    1. Top of page
    2. Cover Image
    3. Highlight
    4. Rapid Communication
    5. Articles
    1. A versatile encapsulation method of noncovalently modified carbon nanotubes by RAFT polymerization (pages 4403–4407)

      Weiheng Zhong, Jules Nguendia Zeuna and Jerome P. Claverie

      Article first published online: 20 JUL 2012 | DOI: 10.1002/pola.26252

      Thumbnail image of graphical abstract

      Using a RAFT polymerization process, uniform polymer coats are physically adsorbed onto the surface of a SWNT and MWNT.

  4. Articles

    1. Top of page
    2. Cover Image
    3. Highlight
    4. Rapid Communication
    5. Articles
    1. Particle and breath figure formation of triblock copolymers having self-complementary hydrogen-bonding units (pages 4408–4414)

      Nojin Park, Myungeun Seo and Sang Youl Kim

      Article first published online: 30 JUL 2012 | DOI: 10.1002/pola.26256

      Thumbnail image of graphical abstract

      A series of triblock copolymers having self-complementary hydrogen-bonding units have been synthesized through RAFT polymerization of the methacrylate monomer containing bis-dendritic benzamide group. The triblock copolymers showed the formation of polymeric nanoparticles and aggregation behavior through intramolecular and intermolecular hydrogen bondings. Well-ordered hexagonal structures were prepared by “Breath Figure” technique.

    2. Optically active core/shell nanoparticles prepared using self-assembled polymer micelle as reactive nanoreactor (pages 4415–4422)

      Haiyang Zhang, Lei Ding, Yu Chen, Wantai Yang and Jianping Deng

      Article first published online: 3 AUG 2012 | DOI: 10.1002/pola.26263

      Thumbnail image of graphical abstract

      A novel approach is developed for the preparation of a unique class of core/shell nanoparticles using self-assembled polymer micelle as a reactive nanoreactor. Such core/shell nanoparticles are composed of optically active helical-substituted polyacetylene (forming the core) and thermosensitive poly(N-isopropylacrylamide) (forming the shell). The nanoparticles simultaneously exhibit remarkable optical activity and thermosensitivity.

    3. A facile “graft from” method to prepare molecular-level dispersed graphene–polymer composites (pages 4423–4432)

      Liang Cui, Jingquan Liu, Rui Wang, Zhen Liu and Wenrong Yang

      Article first published online: 3 AUG 2012 | DOI: 10.1002/pola.26264

      Thumbnail image of graphical abstract

      Graphene–polymer composites of positive-charged poly(dimethyl aminoethyl acrylate), negative-charged poly(acrylic acid) and neutral polystyrene were prepared by “graft from” methodology using reversible addition fragmentation chain transfer (RAFT) polymerization via a pyrene functional RAFT agent modified graphene precursor. Fluorescence spectroscopy evidenced that the RAFT agent was attached on the graphene basal planes by π–π stacking interactions, which is strong enough for anti-dissociation in the polymerization mixture up to 80°C.

    4. Isolation of π-conjugated system through polyfluorene from electronic coupling with side-chain substituents by cardo structures (pages 4433–4442)

      Hyeonuk Yeo, Kazuo Tanaka and Yoshiki Chujo

      Article first published online: 23 JUL 2012 | DOI: 10.1002/pola.26249

      Thumbnail image of graphical abstract

      The electronic coupling via the cardo structure in polyfluorene was investigated. It was found that the electronic states of polyfluorene can be preserved from the introduction of electronic withdrawing and/or donating groups by the cardo structure. The pure blue emissions can be obtained from these polymers.

    5. RAFT-mediated synthesis of poly[(oligoethylene glycol) methyl ether acrylate] brushes for biological functions (pages 4443–4450)

      Adem Zengin and Tuncer Caykara

      Article first published online: 20 JUL 2012 | DOI: 10.1002/pola.26250

      Thumbnail image of graphical abstract

      Poly[(oligoethylene glycol) methyl ether acrylate] [poly(OEGA)] brushes on gold substrate were synthesized by RAFT-mediated polymerization. Poly(OEGA) chains with the terminal carboxylic acid groups introduced by chain transfer agent were functionalized with amine-functionalized biotin units to provide selective attachment points for streptavidin. The successful immobilization of streptavidin molecules on the polymer brushes was observed by fluorescence microscopy.

    6. Thermoresponsive graphene oxide-PNIPAM nanocomposites with controllable grafting polymer chains via moderate in situ SET–LRP (pages 4451–4458)

      Yan Deng, Jin Zhong Zhang, Yongjun Li, Jianhua Hu, Dong Yang and Xiaoyu Huang

      Article first published online: 3 AUG 2012 | DOI: 10.1002/pola.26259

      Thumbnail image of graphical abstract

      PNIPAM polymer chains were grown in situ from the surface of “TRIS”-modified graphene oxide sheets via SET–LRP under mild conditions to afford polymer/graphene oxide hybrid materials with excellent dispersibility and thermoresponsibility.

    7. Highly active and easily accessible catalysts for vinyl polymerization of norbornene obtained by oxidative addition of salicylaldimine ligands to bis(1,5-cyclooctadiene)nickel(0) and methylaluminoxane (pages 4459–4464)

      Anna Maria Raspolli Galletti and Mohammad Hayatifar

      Article first published online: 20 JUL 2012 | DOI: 10.1002/pola.26251

      Thumbnail image of graphical abstract

      A new approach for vinyl polymerization of norbornene (NB) by using nickel precursors bearing salicylaldimine ligands is presented. These novel catalytic systems catalyze the polymerization of NB with very high activity (78,000 kg of polymer/mol of catalyst × h). The high activity appears particularly attractive considering that these precursors areeconomically and ecofriendly prepared in situ with simple synthetic procedure.

    8. Elucidation of the mechanism of surface-initiated atom transfer radical polymerization from a diazonium-based initiator layer (pages 4465–4475)

      Sergey Chernyy, Joseph Iruthayaraj, Marcel Ceccato, Mogens Hinge, Steen Uttrup Pedersen and Kim Daasbjerg

      Article first published online: 20 JUL 2012 | DOI: 10.1002/pola.26253

      Thumbnail image of graphical abstract

      This study elucidates the influence of the initiator structure formed using diazonium chemistry on the kinetics of the surface-initiated atom transfer radical polymerization (SI-ATRP) of methyl methacrylate in acetone using the quartz crystal microbalance technique with dissipation (QCM-D). The QCM-D measurements reveal several new interesting insights. For the first time a direct detection of the formation of a precursor complex between the surface immobilized initiator and the catalyst is shown. Moreover, QCM data allow for the discrimination of mushroom, semi-dilute, and concentrated brush regimes.

    9. Various polycarbonate graft copolymers via diels–alder click reaction (pages 4476–4483)

      Aydan Dag, Mehtap Aydin, Hakan Durmaz, Gurkan Hizal and Umit Tunca

      Article first published online: 30 JUL 2012 | DOI: 10.1002/pola.26254

      Thumbnail image of graphical abstract

      Diels–Alder click reaction is used for the preparation of various types of aliphatic polycarbonates (PCs). The novel anthracene-functionalized cyclic carbonate monomer, anthracen-9-ylmethyl 5-methyl-2-oxo-1,3-dioxane-5-carboxylate (2), was prepared and used for the following ROP affording the synthesis of the PC with pendant anthracene groups (PC-anthracene) using 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)/1-(3,5-bis(trifloromethyl)phenyl)-3-cyclohexylthiourea (TU) as catalyst and benzyl alcohol as initiator in CH2Cl2 at room temperature. Subsequently, the PC-anthracene was clicked with a linear α-furan protected-maleimide terminated-poly(methyl methacrylate) (PMMA-MI), or –poly(ethylene glycol) (PEG-MI), or a mixture of PMMA-MI and PEG-MI to yield well-defined PC graft or hetero graft copolymers, PC-g-PMMA or PC-g-PEG, or PC-g-(PMMA)-co-PC-g-(PEG), respectively using Diels-Alder click reaction in toluene at 110°C.

    10. Polyelectrolyte complex nanoparticles from chitosan and poly(acrylic acid) and Polystyrene-block-poly(acrylic acid) (pages 4484–4493)

      Julien Rolland, Pierre Guillet, Jean-Marc Schumers, Nicolas Duhem, Véronique Préat and Jean-François Gohy

      Article first published online: 30 JUL 2012 | DOI: 10.1002/pola.26255

      Thumbnail image of graphical abstract

      Chitosan-based nanoparticles were prepared by interpolymer polyelectrolyte complexation with a poly(acrylic acid) homopolymer and with a polystyrene-block-poly(acrylic acid) diblock copolymer, respectively. Parameters such as the charge ratio between the mixed partners, pH, and ionic strength were thoroughly studied by dynamic light scattering and led to the identification of domains of stability for the accordingly obtained nanoparticles.

    11. Synthesis and clustering of supramolecular “graft” polymers (pages 4494–4506)

      Katharina Hackethal, Florian Herbst and Wolfgang H. Binder

      Article first published online: 3 AUG 2012 | DOI: 10.1002/pola.26257

      Thumbnail image of graphical abstract

      Synthesis and dynamics of supramolecular poly(isobutylene) networks bearing statistically distributed hydrogen-bonding moieties (a weak pyridinium/pyridine interaction and a (stronger) 2,6-diaminotriazine/thymine interaction) are reported, aiming at the understanding of network formation in self-healing materials. In the melt state, a clear difference in the (weaker) pyridinium/pyridine interaction (effective cluster lifetime τb * ∼ 1 s) to the 2,6- (stronger) diamintriazine/thymine interaction (τb * ∼ 100 s) is observed now enabling the future design of self-healing rubbery supramolecular polymers.

    12. Cationic cure kinetics of a polyoxometalate loaded epoxy nanocomposite (pages 4507–4515)

      Benjamin J. Anderson

      Article first published online: 6 AUG 2012 | DOI: 10.1002/pola.26258

      Thumbnail image of graphical abstract

      Conversion of reactive glycidyl groups as determined from the area of DSC measured exotherms versus time for different isothermal cure temperatures of a phosophotungstate-epoxy nanocomposite with a phosophotungstate volume fraction of 0.05. The solid lines are best fits to an autocatalytic rate expression.

    13. Toward the design of LPEI containing block copolymers: Improved synthesis protocol, selective hydrolysis, and detailed characterization (pages 4516–4523)

      Lutz Tauhardt, Kristian Kempe and Ulrich S. Schubert

      Article first published online: 6 AUG 2012 | DOI: 10.1002/pola.26261

      Thumbnail image of graphical abstract

      The synthesis of poly(2-ethyl-2-oxazoline)-block-poly(2-H-2-oxazoline) (PEtOx-b-PHOx) and the subsequent selective hydrolysis to PEtOx-b-LPEI is described. Therefore, an improved and straightforward synthesis of the monomer HOx was developed, and its polymerization kinetics were investigated. The polymers were characterized in detail by 1H NMR spectroscopy and MALDI-TOF-MS.

    14. Synthesis of a new 2-amino-glycan, poly-(1→6)-α-D-mannosamine, by ring-opening polymerization of 1,6-anhydro-mannosamine derivatives (pages 4524–4531)

      Kazuyuki Hattori and Takashi Yoshida

      Article first published online: 3 AUG 2012 | DOI: 10.1002/pola.26262

      Thumbnail image of graphical abstract

      A new stereoregular 2-amino-glycan composed of a mannosamine residue was prepared by ring-opening polymerization of anhydro sugars. Two different monomers, 1,6-anhydro-2-azido-mannose derivative and 1,6-anhydro-2-(N, N-dibenzylamino)-mannose derivative, were synthesized and polymerized. Although the 2-azido monomer gave merely oligomers, the 2-(protected amino) monomer was promptly polymerized into high polymers with 1,6-α stereoregularity. The differences of each polymerizability from those of the corresponding glucose homologs were discussed from the view point of configuration of the substituent on C2.

    15. Biocompatible poly(ethylene glycol)-poly(γ-cholesterol-L-glutamate) copolymers: Synthesis, characterization, and in vitro studies (pages 4532–4537)

      Yang Wu, Qing Ma, Xiangrong Song, Yu Zheng, Wen Ren, Jinkun Zhang, Liang Ouyang, Fengbo Wu and Gu He

      Article first published online: 3 AUG 2012 | DOI: 10.1002/pola.26265

      Thumbnail image of graphical abstract

      A novel amphiphilic poly(ethylene glycol)-block-poly(γ-cholesterol-L-glutamate) (mPEG-PCHLG) diblock copolymer has been synthesized and characterized. The mPEG-PCHLG copolymers could aggregate into nanoparticles with PCHLG blocks as the hydrophobic core and PEG blocks as the hydrophilic shell and the nanoparticles have shown good physicochemical properties and low toxicity.

    16. Microspheres from stereocomplexes of polylactides containing ionic liquid end-groups (pages 4538–4547)

      Tadeusz Biedroń, Marek Brzeziński, Tadeusz Biela and Przemysław Kubisa

      Article first published online: 7 AUG 2012 | DOI: 10.1002/pola.26266

      Thumbnail image of graphical abstract

      Stereocomplex of poly(L-lactide) and poly(D-lactide) containing imidazolium ionic liquid end-groups (PLA-IL) precipitates from 1,4-dioxane solution in the form of monodisperse, perfectly spherical microspheres. Such behavior of PLA-IL, not observed for polymers containing other end-groups such as HO[BOND], C4H9O[BOND], CF3O[BOND], or C4F7H2O[BOND] groups, can be attributed to the presence of strongly interacting end-groups derived from ionic liquid.

    17. Improving dispersion and integration of single-walled carbon nanotubes in epoxy composites by using a reactive noncovalent dispersant (pages 4548–4556)

      Shuai Zhao, Zhongxin Song, Jian Cui, Chaoqin Li and Yehai Yan

      Article first published online: 14 AUG 2012 | DOI: 10.1002/pola.26267

      Thumbnail image of graphical abstract

      An epoxide-containing pyrene derivative is designed, synthesized, and used as a reactive noncovalent dispersant for improving dispersion and integration of single-walled carbon nanotubes in epoxy composites.

    18. Synthesis and properties of conjugated copolycondensates consisting of carbazole-2,7-diyl and fluorene-2,7-diyl (pages 4557–4562)

      Tadaaki Horii, Toshinobu Shinnai, Kazuhiko Tsuchiya, Takeshi Mori and Masashi Kijima

      Article first published online: 7 AUG 2012 | DOI: 10.1002/pola.26268

      Thumbnail image of graphical abstract

      For the purpose of developing an efficient blue-emitting polymer used in organic light-emitting diodes (OLEDs), N-arylcarbazole-2,7-diyl unit was copolycondensed with 9,9-dioctylfluorene-2,7-diyl unit in random and alternating orders, respectively, to add electron injection ability in addition to hole-injection and -transport ability of poly(carbazole-2,7-diyl)s. An OLED device embedded with the random copolycondensate worked efficiently under operating voltages lower than 7 V, whose performance was notably higher compared to other devices embedded with the alternating copolycondensate and each homopolymer.

    19. Synthesis and characterization of organic–inorganic hybrid block copolymers containing a fully condensed ladder-like polyphenylsilsesquioxane (pages 4563–4570)

      Albert Sung Soo Lee, Seung-Sock Choi, He Seung Lee, Hyeon Yeol Jeon, Kyung-Youl Baek and Seung Sang Hwang

      Article first published online: 14 AUG 2012 | DOI: 10.1002/pola.26269

      Thumbnail image of graphical abstract

      A series of well-defined organic–inorganic hybrid block copolymers were synthesized by atom transfer radical polymerization. The inorganic block consisted of a ladder-like structured polyphenylsilsesquioxane and was utilized as polymeric macroinitiator for the polymerization for hard and soft organic polymers, polystyrene, and poly(n-butyl acrylate). Synthesized hybrid block copolymers exhibited unique thermal properties.

    20. Cationic addition polymerization of 1,4-dioxene using gacl3 as lewis acid catalyst: Long-lived species-mediated polymerization (pages 4571–4578)

      Kyohei Uchigami, Arihiro Kanazawa, Shokyoku Kanaoka and Sadahito Aoshima

      Article first published online: 14 AUG 2012 | DOI: 10.1002/pola.26271

      Thumbnail image of graphical abstract

      Highly effective cationic addition polymerization of 1,4-dioxene, a six-membered cyclic olefin with two oxygen atoms adjacent to the double bond, was performed using a simple metal halide catalyst system in dichloromethane. The propagating reaction was well controlled when the reaction was conducted using GaCl3 with an isobutyl vinyl ether–HCl adduct as a cationogen at –78°C to give polymers with predetermined molecular weights and relatively narrow molecular weight distributions. The obtained poly(1,4-dioxene) exhibited a very high glass transition temperature of 217°C and unique solubility.

    21. PEG-b-PtBA-b-PHEMA well-defined amphiphilic triblock copolymer: Synthesis, self-assembly, and application in drug delivery (pages 4579–4588)

      Li Yuan, Wulian Chen, Jing Li, Jianhua Hu, Jianjun Yan and Dong Yang

      Article first published online: 17 AUG 2012 | DOI: 10.1002/pola.26273

      Thumbnail image of graphical abstract

      An acid-sensitive PEG-b-PtBA-b-P(HEMA-CAD) prodrug with high drug loading content reaching up to 38% was synthesized, which can deliver drugs through either physical embedding method or covalently linkage method.

SEARCH

SEARCH BY CITATION