Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Vol. 45 Issue 19

1 October 2007

Volume 45, Issue 19

Pages 4401–4544

  1. Articles

    1. Top of page
    2. Articles
    1. UV-photodimerization in uracil-substituted dendrimers for high density data storage (pages 4401–4412)

      Brian Lohse, Robert Vestberg, Mario T. Ivanov, Søren Hvilsted, Rolf H. Berg, P. S. Ramanujam and Craig J. Hawker

      Version of Record online: 17 AUG 2007 | DOI: 10.1002/pola.22202

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      The enhanced chain and density of uracil functionalized dendrimers has been exploited in the design of novel ultra-high density recording materials. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

    2. Synthesis of polystyrene brush on multiwalled carbon nanotubes treated with KMnO4 in the presence of a phase-transfer catalyst (pages 4413–4420)

      Myunghun Kim, Chang Kook Hong, Soona Choe and Sang Eun Shim

      Version of Record online: 17 AUG 2007 | DOI: 10.1002/pola.22190

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      MWNTs were effectively functionalized with KMnO4 with the aid of a phase transfer catalyst at room temperature. The hydroxyl functionalized MWNTs were reacted with a vinyl-group carrying silane coupling agent, and the terminal vinyl groups on MWNTs were used to fabricate polystyrene brushes. Finally, polystyrene-encapsulated MWNTs were obtained by simple in situ solution polymerization.

    3. Synthesis and refractive-index control of fluoropolymers by the polyaddition of bis(epoxide)s and triazine di(aryl ether)s (pages 4421–4429)

      Hiroto Kudo, Nobuhito Ito, Keiji Nakajima, Masami Ochiai and Tadatomi Nishikubo

      Version of Record online: 17 AUG 2007 | DOI: 10.1002/pola.22191

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      Fluorine-containing poly(cyanurate)s (fluoropolymers) were synthesized by the polyaddition of fluorine-containing bis(epoxide)s and fluorine-containing triazine di(aryl ether)s. The linear relationship between the values of refractive-indices (nD's) and ratios of fluorine contents of the resulting fluoropolymers were found. The increase of glass transition temperatures of fluoropolymers with their ratios of fluorine contents was also observed.

    4. New conjugated polymers comprising ortho-phenylazonaphthols: Synthesis and chromogenic behaviors (pages 4430–4440)

      Moon Soo Choi, Jung Hyo Lee, Dong Wook Kim and Taek Seung Lee

      Version of Record online: 17 AUG 2007 | DOI: 10.1002/pola.22192

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      A new series of poly(ortho-phenylazonaphthol) derivatives was synthesized using the Suzuki cross-coupling reaction and characterized for potential uses in colorimetric sensing for fluoride anion and chromogenic patterning on electrospun fiber web.

    5. A tailor-made polymethacrylate bearing a reactive diene in reversible diels–alder reaction (pages 4441–4449)

      A. Amalin Kavitha and Nikhil K. Singha

      Version of Record online: 17 AUG 2007 | DOI: 10.1002/pola.22195

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      The tailor-made polyfurfuryl methacrylate (PFMA) was successfully polymerized by atom transfer radical polymerization. Successful Diels Alder (DA) was carried out using the furfuryl group in PFMA as diene and a maleimide as dienophile. The resultant material was thermo-reversible as evidenced by FT-IR and DSC studies. Utilization of DA chemistry in polymer cross-linking reaction to build up the polymer networks resulted in a new class of thermally reversible cross-linked polymers.

    6. Synthesis and chiroptical properties of optically active poly(ethynylcarbazole) derivatives: Substituent effect on the helix formation (pages 4450–4458)

      Fumio Sanda, Ritsuya Kawasaki, Masashi Shiotsuki and Toshio Masuda

      Version of Record online: 17 AUG 2007 | DOI: 10.1002/pola.22203

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      2-Ethynyl-9-[(S)-2-methylbutoxycarbonyl]carbazole (1), 3-ethynyl-9-[(S)-2-methylbutoxycarbonyl]carbazole (2), 2-ethynyl-9-[(S)-2-methylbutyl]carbazole (3), and 2-ethynyl-9-[(S)-4-methylhexyl]carbazole (4) were synthesized and polymerized with [(nbd)RhCl]2–Et3N. The corresponding polyacetylenes with moderate molecular weights were obtained in good yields. Poly(1) exhibited a large specific rotation and an intense Cotton effect in toluene, indicating that it formed a helix with predominantly one-handed screw sense, while the other three polymers showed no evidence for taking a helical structure. Poly(1) largely decreased the CD intensity upon heating from –10 to 60 °C. Poly(1) showed a Cotton effect in film state in a manner similar to solution state.

    7. Living cationic ring-opening polymerization of five-membered cyclic dithiocarbonate controlled by neighboring group participation of carbamate group (pages 4459–4464)

      Suguru Motokucho, Atsushi Sudo and Takeshi Endo

      Version of Record online: 17 AUG 2007 | DOI: 10.1002/pola.22206

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      A five-membered cyclic dithiocarbonate having phenylcarbamate moiety 1 underwent living cationic ring opening polymerization. The living fashion as well as the regioselective formation of the repeating unit suggested significant contribution of the neighboring group participation of the carbamate group to form a stabilized cationic propagating end.

    8. Hyperbranched luminescent polyfluorenes containing aromatic triazole branching units (pages 4465–4476)

      Lin-Ren Tsai and Yun Chen

      Version of Record online: 17 AUG 2007 | DOI: 10.1002/pola.22208

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      Hyperbranched polymers P2P4 were prepared by A3 + A2 + B2 approach based on Suzuki coupling. A linear relationship between 1/λmax and 1/(1 – ntriazole) was correlated (λmax: absorption maximum; ntriazole: molar fraction of triazole unit). The hyperbranched structures effectively suppress excimer formation (∼ 550 nm) under thermal annealing in P4. The maximum brightness of the EL devices improved from 828 cd/m2 (P2) to 2054 cd/m2 (P4) with increasing triazole content (4.8–13.3 mol %). The results suggest that triazole branch unit is effective in improving thermal stability and EL performance of polyfluorenes.

    9. Synthesis and morphology of polyethylene chains grafted onto the surface of crosslinked polystyrene microspheres (pages 4477–4486)

      Liya Shi, Wuguo Bi, Hui Chen and Tao Tang

      Version of Record online: 17 AUG 2007 | DOI: 10.1002/pola.22218

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      Polyethylene grafted onto the surface of crosslinked polystyrene microspheres (PS-g-PE) were prepared via tandem copolymerization of a bifunctional comonomer 4-(3-butenyl)styrene with styrene and ethylene, respectively. The content of PE grafted onto the surface of c-PS microspheres could be controlled by varying the polymerization time or the initial quantity of pendant butenyl group on the surface of c-PS microspheres. The PS-g-PE microspheres showed various surface patterns under different crystallization conditions due to crystallization of grafted polyethylene on the surface of crosslinked polystyrene microspheres.

    10. Synthesis and properties of various poly(diarylacetylenes) containing siloxy and hydroxy groups (pages 4487–4495)

      Yanming Hu, Masashi Shiotsuki and Toshio Masuda

      Version of Record online: 17 AUG 2007 | DOI: 10.1002/pola.22276

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      Poly(diarylacetylenes) containing siloxy and either naphthyl, fluorenyl, or biphenyl groups were synthesized by the polymerization of the corresponding monomers with TaCl5n-Bu4Sn catalyst. Free-standing membranes of polymers were fabricated by casting from toluene solution. Desilylation of polymer membranes was carried out with trifluoroacetic acid to afford poly(diarylacetylenes) membranes having hydroxy groups. The CO2 permeability coefficients of these membranes were in the range of 65–640 barrers. The points of polymer membranes containing hydroxy and either naphthyl or fluorenyl groups in the PCO2 versus PCO2/PCH4 plot were located above Robeson's upper bound.

    11. Enhancing electrochromic properties of conducting polymers via copolymerization: Copolymer of 1-(4-fluorophenyl)-2,5-di(thiophen-2-yl)-1H-pyrrole with 3,4-ethylene dioxythiophene (pages 4496–4503)

      Ozlem Turkarslan, Metin Ak, Cihangir Tanyeli, Idris M. Akhmedov and Levent Toppare

      Version of Record online: 17 AUG 2007 | DOI: 10.1002/pola.22166

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      (a) Colors and corresponding to the L, a, and b values of the P(FPTP-co-EDOT) film at different applied potentials in 0.1 M LiClO4/AN. (b) Colors and corresponding L, a, b values of the device at different applied potentials.

    12. High-efficiency poly(phenylenevinylene)-co-fluorene copolymers incorporating a triphenylamine as the end group for white-light-emitting diode applications (pages 4504–4513)

      Chao-Hui Kuo, Wei-Kang Cheng, Kun-Rung Lin, Man-Kit Leung and Kuo-Huang Hsieh

      Version of Record online: 17 AUG 2007 | DOI: 10.1002/pola.22194

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      A high-efficiency LED white-light CIE 1931 (coordinates of 0.31, 0.34) was fabricated. The device exhibited a high current efficiency of 3.5 cd/A and a brightness of 973 cd/m2.

    13. Polymeric nanocomposites containing polyhedral oligomeric silsesquioxanes prepared via frontal polymerization (pages 4514–4521)

      Alberto Mariani, Valeria Alzari, Orietta Monticelli, John A. Pojman and Giuseppe Caria

      Version of Record online: 17 AUG 2007 | DOI: 10.1002/pola.22185

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      Nanocomposites made of epoxy resins containing polyhedral oligomeric silsesquioxanes (POSS) as nanofillers have been successfully prepared by frontal polymerization. No significant differences have been found by comparing the so-obtained samples with those fabricated by the classical batch technique. However, the shorter reaction time and the extremely simple synthetic procedure suggest that frontal polymerization is a convenient technique for the preparation of these polymeric materials. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]

    14. Hydrophilic segmented block copolymers based on poly(ethylene oxide) and monodisperse amide segments (pages 4522–4535)

      Debby Husken, Jan Feijen and Reinoud J. Gaymans

      Version of Record online: 17 AUG 2007 | DOI: 10.1002/pola.22186

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      PEO-based segmented block copolymers with mono-disperse amide segments crystallized fast and had a high dimensional stability. The length of the PEO segments had a strong effect on the melting temperature of the PEO segments in the copolymer and with that on the low temperature properties.

    15. Synthesis and characterization of poly(vinyl alcohol)-graft-[poly(D,L-lactide)/poly(D,L-lactide-co-glycolide)] hydrogels (pages 4536–4544)

      Elvira Vidović, Doris Klee and Hartwig Höcker

      Version of Record online: 17 AUG 2007 | DOI: 10.1002/pola.22187

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      Hydrogels of different properties with particular regard to the hydrophilicity were successfully synthesized. The graft copolymers of poly(vinyl alcohol) and polyesters [poly(D,L-lactide) or poly(D,L-lactide-co-glycolide)] (PES) of different length and extent of grafting were obtained in the three step polymerization that finally resulted in crosslinked structure the swellability and thermal properties of which were closely examined.

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