Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Vol. 43 Issue 6

15 March 2005

Volume 43, Issue 6

Pages ix–ix, 1155–1316

  1. Editorial

    1. Top of page
    2. Editorial
    3. Articles
    4. Notes
    1. You have free access to this content
  2. Articles

    1. Top of page
    2. Editorial
    3. Articles
    4. Notes
    1. Stimuli-responsive reversible physical networks. I. Synthesis and physical network properties of amphiphilic block and random copolymers with long alkyl chains by living cationic polymerization (pages 1155–1165)

      Tomohide Yoshida, Ken-Ichi Seno, Shokyoku Kanaoka and Sadahito Aoshima

      Article first published online: 2 FEB 2005 | DOI: 10.1002/pola.20589

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      Well-defined amphiphilic block and random copolymers with crystallizable octadecyl pendants (ODVE) can be obtained by living cationic polymerization. Aqueous solutions of the copolymers yielded physical gels upon cooling due to strong interaction between ODVE units, irrespective of the copolymer sequence distribution. The product gels, however, exhibited different viscoelastic properties as shown here: A 20 wt% solution of a block copolymer (MOVE/ODVE = 400/20) became a soft physical gel that behaved like a typical gel, whereas the corresponding random copolymer gave a transparent but stiff gel with a certain relaxation time.

    2. Kinetic studies on the thermal polymerization of N-chloroacetyl-11-aminoundecanoate potassium salt (pages 1166–1176)

      Xavier Ramis, Josep María Salla and Jordi Puiggalí

      Article first published online: 2 FEB 2005 | DOI: 10.1002/pola.20594

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      A potassium salt of N-chloroacetyl-11-aminoundecanoate was thermally polymerized to obtain the corresponding poly(glycolic acid-alt-11-aminoundecanoic acid). A kinetic study was then performed that was based on isothermal and nonisothermal polymerizations performed in a differential scanning calorimeter. A kinetic analysis was performed with an integral isoconversional procedure (free model), and the kinetic model was determined both with the Coats–Redfern method (the obtained isoconversional value being accepted as the effective activation energy) and through the compensation effect. Isothermal polymerization was simulated with nonisothermal data.

    3. Thiophene-cored 2,2-bis(methylol)propionic acid dendrimers for optical-power-limiting applications (pages 1177–1187)

      Robert Vestberg, Christina Nilsson, Cesar Lopes, Per Lind, Bertil Eliasson and Eva Malmström

      Article first published online: 2 FEB 2005 | DOI: 10.1002/pola.20588

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      Thiophene-cored dendrimers based on 2,2-bis(methylol)propionic acid were successfully synthesized up to the fourth generation. These well-defined dendritic molecules exhibited optical-power-limiting properties.

    4. Stereospecific sequential block copolymerizations of styrene and 1,3-butadiene with a C5Me5TiMe3/B(C6F5)3/Al(oct)3 catalyst (pages 1188–1195)

      Hoang The Ban, Yasuo Tsunogae and Takeshi Shiono

      Article first published online: 2 FEB 2005 | DOI: 10.1002/pola.20592

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      Highly stereoregular ST-BD block copolymers, composed of syndiotactic polystyrene segments chemically bonded with cis-polybutadiene segments, were prepared through a stereospecific sequential block copolymerization of ST with BD in the presence of a C5Me5TiMe3/B(C6F5)3/Al(oct)3 catalyst. GPC, NMR, and DSC characterizations of the products proved that the block copolymerization reaction proceeded effectively to yield syn-PS-b-cis-PB copolymers with controllable molecular weights and compositions. SEM results suggested that this block copolymer can be used as an effective compatibilizer for the binary syn-PS/cis-PB blends.

    5. Structural investigations of polypropylene glycol (PPG) and isophorone diisocyanate (IPDI)-based polyurethane prepolymer by 1D and 2D NMR spectroscopy (pages 1196–1209)

      A. Prabhakar, D. K. Chattopadhyay, B. Jagadeesh and K. V. S. N. Raju

      Article first published online: 3 FEB 2005 | DOI: 10.1002/pola.20583

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      Polyurethane prepolymers are widely used in the reactive hot melt adhesives and moisture cured coatings. The importance of structural elucidation by liquid state NMR spectroscopy is due to the control of reaction time in order to undertake reliable industrial processes. In the present investigation NCO-terminated polyurethane prepolymer of polypropylene glycol and isophoron diisocyanate were prepared.

    6. Negative-working photoresist based on a first-generation dendrimer consisting of 4,4-diphenylpentyloxy units (pages 1210–1215)

      Yasushi Kamimura, Osamu Haba, Takeshi Endo and Mitsuru Ueda

      Article first published online: 3 FEB 2005 | DOI: 10.1002/pola.20608

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      A first-generation dendrimer (2), containing phenol groups in the exterior for solubilization in aqueous alkaline solutions, was evaluated as a new negative-working, alkaline-developable photoresist material. A negative-working photoresist based on 2, 4,4′-methylenebis[2,6-bis(hydroxymethyl)phenol] as a crosslinker, and diphenyliodonium 9,10-dimethoxyanthracene-2-sulfonate as a photoacid generator was demonstrated. This resist gave a clear negative pattern through postbaking at 90 °C after exposure to UV light, which was followed by development with a 2.38% aqueous tetramethyl ammonium hydroxide solution at room temperature.

    7. Influence of tertiary diamines on the synthesis of high-molecular-weight poly(1,3-cyclohexadiene) (pages 1216–1227)

      David T. Williamson, Lars Kilian and Timothy E. Long

      Article first published online: 2 FEB 2005 | DOI: 10.1002/pola.20361

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      The living synthesis of poly(1,3-cyclohexadiene) was performed with an initiator adduct that was synthesized from a 1:2 (mol/mol) mixture of N,N,N,N′-tetramethylethylenediamine and n-butyllithium. This initiator, which was preformed at 65 °C, facilitated the synthesis of high-molecular-weight poly(1,3-cyclohexadiene) (number-average molecular weight = 50,000 g/mol) with a narrow molecular weight distribution (weight-average molecular weight/number-average molecular weight = 1.12). A plot of the kinetic chain length versus the time indicated that termination was minimized and chain transfer to the monomer was eliminated when a preformed initiator adduct was used. Chain transfer was determined to occur when the initiator was generated in situ.

    8. Reaction of phenylacetylene with Ti(OR)4[BOND]AlEt3 and V(acac)3[BOND]AlEt3: Cyclotrimerization versus chain oligomerization (pages 1228–1237)

      J. G. Rodríguez, A. Lafuente and R. Martín-Villamil

      Article first published online: 3 FEB 2005 | DOI: 10.1002/pola.20609

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      Polymerization of phenylacetylene was carried out with the microheterogeneous Ti(OR)4[BOND]AlEt3 and homogeneous V(acac)3[BOND]AlEt3 Ziegler-Natta catalyst system. Influence of some co-catalyst such as pyridine and phenylacetylide, solvent, temperature, and time parameters, have been analyzed. Both catalyst systems produced poly(phenylacetylene) (PPA) and a 1,2,4-/1,3,5-triphenylbenzene (TPB) cyclotrimers mixture in variable molar ratio. The titanium catalyst showed the lowest PPA/TPB ratio. The 1,2,4-/1,3,5-TPB molar ratio decreased with increasing PPA. On the basis of the spectroscopic data, PPA had a cis-transoidal stereo-regular structure. The molecular mass of PPA was determined by vapor pressure osmometry and by GPC chromatography methods. A mechanism for the polymerization reaction versus cyclotrimerization was proposed.

    9. Pinecone-like Cu(II) crystal growth on the surface of amine-group-immobilized polymers (pages 1238–1247)

      Young Gun Ko, Dong Hun Shin and Ung Su Choi

      Article first published online: 3 FEB 2005 | DOI: 10.1002/pola.20619

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      Cu(II) complexes and Cu(OH)2 crystal growth on poly(acryloamidino ethylene amine) (a chelating polymer) were observed at various elapsed growth times. Up to an elapsed time of 16 min, crystal growth was observed in only one direction. After an elapsed time of 20 h, pinecone-like crystals covered the entire surface of synthesized poly(acryloamidino ethylene amine) fiber.

    10. Syntheses of cyclic polycarbonates by the direct phosgenation of bisphenol M (pages 1248–1254)

      Hans R. Kricheldorf, Sigrid Böhme, Gert Schwarz and Claus-Ludolf Schultz

      Article first published online: 3 FEB 2005 | DOI: 10.1002/pola.20613

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      Interfacial polycondensations of bisphenol M with diphosgene or triphosgene were performed under various reaction conditions. High fractions of cyclic polycarbonates were detected by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, and bimodal mass distributions were detected by size exclusion chromatography measurements.

    11. Functionalization of the active chain ends of poly(vinyl chloride) obtained by single-electron-transfer/degenerative-chain-transfer mediated living radical polymerization: Synthesis of telechelic α,ω-di(hydroxy)poly(vinyl chloride) (pages 1255–1260)

      Virgil Percec and Anatoliy V. Popov

      Article first published online: 7 FEB 2005 | DOI: 10.1002/pola.20607

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      The quantitative functionalization of poly(vinyl chloride) containing two active chloroiodomethyl (∼CHClI) chain ends was performed through Kharasch-like addition to 2-allyloxyethanol (CH2[DOUBLE BOND]CHCH2OCH2CH2OH). This reaction was performed in dimethyl sulfoxide (DMSO) at 70 °C and was catalyzed by sodium dithionite/sodium bicarbonate.

    12. Some mixed cyclopentadienyl–indenyl zirconium complexes with PhCH2 or PhCH2CH2 substituents in ethylene polymerization (pages 1261–1269)

      Yong Zhang, Jiling Huang, Xiaoxia Yang, Jun Zhang and Yanlong Qian

      Article first published online: 7 FEB 2005 | DOI: 10.1002/pola.20593

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      Complexes (RCp)(R′Ind)ZrCl2 were studied for ethylene polymerization in the presence of MAO. The relationships between polymerization results and their structures were analyzed with NMR spectra data.

    13. New light-colored poly(ether imide)s based on 2,5-di-tert-butylhydroquinone bis(ether anhydride) and aromatic diamines (pages 1270–1284)

      Chin-Ping Yang and Mei-Yuan Hsu

      Article first published online: 8 FEB 2005 | DOI: 10.1002/pola.20584

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      A series of poly(ether imide)s, IIIa–k, with light color and good physical properties were prepared from 1,4-bis(3,4-dicarboxypheoxy)-2,5-di-tert-butylbenzene dianhydride (I) with various aromatic diamines (IIa–k) via a thermal imidization method. These polymers showed lower b* values and higher transparency than commonly available polyimides. The III series showed good solubility, excellent thermal stability, good mechanical properties, a low dielectric constant, and low moisture absorption.

    14. Copolymerization of ethylene with cycloolefins or cyclodiolefins by a constrained-geometry catalyst (pages 1285–1291)

      Naofumi Naga

      Article first published online: 7 FEB 2005 | DOI: 10.1002/pola.20575

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      Copolymerization of ethylene and various cycloolefins and cyclodiolefins was investigated with a constrained-geometry catalyst, dimethylsilylene(tetramethylcyclopentadienyl)(N-tert-butyl)titanium dichloride, using methyl-isobutyl aluminoxane as a cocatalyst. The corresponding copolymers were obtained in the copolymerization with cyclopentene, cycloheptene, cyclooctene, NB, 1,3-cyclopentadiene, 1,5-cyclooctadiene, 2,5-norbornadiene, and dicyclopentadiene. Structures of the cycloolefins and cyclodoolefins affected monomer reactivity and insertion mode.

    15. Synthesis and characterization of random and block copolymers with pendant rhenium diimine complexes by controlled radical polymerization (pages 1292–1308)

      Chui Wan Tse, Lillian Sze Man Lam, Ka Yan Kitty Man, Wing Tak Wong and Wai Kin Chan

      Article first published online: 7 FEB 2005 | DOI: 10.1002/pola.20587

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      Homopolymers and block copolymers containing pendant rhenium diimine complexes were synthesized by atom transfer radical polymerization. The polymerization reaction conditions and the photosensitivity and morphology of the resulting polymers were studied.

  3. Notes

    1. Top of page
    2. Editorial
    3. Articles
    4. Notes
    1. You have free access to this content
      Stable poly(methyl methacrylate-co-divinylbenzene) microspheres via precipitation polymerization (pages 1309–1311)

      Sunhye Yang, Sang Eun Shim and Soonja Choe

      Article first published online: 8 FEB 2005 | DOI: 10.1002/pola.20417

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      Stable poly(MMA-co-DVB) microspheres were prepared by precipitation polymerization using acetonitrile as the main medium under various polymerization conditions including monomer and initiator concentrations.

    2. You have free access to this content
      Homo- and copolymerization of 2,2-dimethyltrimethylene carbonate promoted by samarium thiolate derivatives: Novel and versatile initiators (pages 1312–1316)

      Huanrong Li, Yingming Yao, Changsheng Yao, Hongting Sheng and Qi Shen

      Article first published online: 8 FEB 2005 | DOI: 10.1002/pola.20620

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      The tri- and divalent samarium thiolate derivatives were first found to be highly active initiators for the ring-opening polymerization of 2,2-dimethyltrimethylene carbonate (DTC) and the copolymerization of DTC and ε-caprolactone (ε-CL).