Journal of Polymer Science Part A: Polymer Chemistry

Cover image for Journal of Polymer Science Part A: Polymer Chemistry

1 August 2001

Volume 39, Issue 15

Pages 2557–2682

  1. Highlights

    1. Top of page
    2. Highlights
    3. Articles
    4. Note
    1. You have free access to this content
      Lessons learned from research on photorefractive polymers and molecular materials (pages 2557–2564)

      Luping Yu

      Version of Record online: 5 JUN 2001 | DOI: 10.1002/pola.1232

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      Organic photorefractive (PR) materials possess both an electrooptic effect and photoconductivity. It is a challenge to integrate these properties into a single polymer system that will exhibit this PR effect. This article summarizes the research efforts in the design and synthesis of fully functionalized PR organic materials. Systems ranging from polyurethanes, polyimides, functionalized conjugated polymers, to monolithic molecular materials are discussed.

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      Nylon–selected topics (pages 2565–2570)

      Joseph Zimmerman and Melvin I. Kohan

      Version of Record online: 6 JUN 2001 | DOI: 10.1002/pola.1233

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      Parts of personal contributions to the technology of nylon fibers and plastics are reviewed. These include quantifying the effects of end-group imbalance, the kinetics of caprolactam and solid-phase polymerzation, fiber tensile strength versus molecular weight, melt behavior, the glass-transition temperature, and the prospect for new nylons.

  2. Articles

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    2. Highlights
    3. Articles
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    1. Synthesis and optical and electrochemical properties of novel polyethers containing isolated distyrylbenzene derivatives and side-aromatic 1,3,4-oxadiazole chromophores (pages 2571–2580)

      Yun Chen and Shiao-Ping Lai

      Version of Record online: 5 JUN 2001 | DOI: 10.1002/pola.1234

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      The polyethers (P2, P4) were prepared by Horner–Wadsworth–Emmons olefination, and their reduced viscosities were about 0.20–0.33 dL/g. The band gaps were at 2.76–2.85 eV. The photoluminescence (PL) maxima ranged from 459 to 469 nm, and the PL quantum efficiencies were 0.62–0.77 and 0.23–0.40 in solution and the film state, respectively. Cyclic voltammetric (CV) investigations demonstrated that oxadiazole moieties decrease the barrier of electron injection but also retard hole injection.

    2. Synthesis and characterization of soluble fluorine-containing polyimides based on 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene (pages 2581–2590)

      K. Xie, S. Y. Zhang, J. G. Liu, M. H. He and S. Y. Yang

      Version of Record online: 6 JUN 2001 | DOI: 10.1002/pola.1235

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      A class of fluorine-containing aromatic polyimides with good solibility, low-moisture absorption, exceptional thermal stability, good mechanical properties, and great hygrothermal resistance were prepared by the polycondensation of 1,4-bis(4-amino-2-trifluoromethylphenoxy) benzene and various aromatic dianhydrides.

    3. Synthesis and properties of alternating copolyamide-imides based on 2,6-bis(4-aminophenoxy)naphthalene and comparison with its related isomeric polymers (pages 2591–2601)

      Chin-Ping Yang, Chun-Cheng Yang and Ruei-Shin Chen

      Version of Record online: 6 JUN 2001 | DOI: 10.1002/pola.1236

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      A series of novel polyamide-imides containing 2,6-bis(phenoxy)naphthalene units were synthesized by triphenyl phosphite-activated polycondensation from 2,6-bis(4-aminophenoxy)naphthalene with various aromatic bis(trimellitimide)s. The polymers were obtained in quantitative yield with inherent viscosities up to 1.53 dL/g. Most of the polymers showed good solubility and could be solution-cast into transparent, flexible, and tough films. The cast films exhibited good tensile properties. The polyamide-imides generally showed high thermal stability, and wide-angle X-ray diffraction revealed that most polymers were amorphous.

    4. Syntheses and characterizations of bis(trialkoxysilyl)oligoimides. II. Syntheses and characterizations of fluorinated crosslinkable oligoimides with low refractive indices (pages 2602–2619)

      L. Bes, A. Rousseau, B. Boutevin and R. Mercier

      Version of Record online: 7 JUN 2001 | DOI: 10.1002/pola.1237

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      New α,ω-trialkoxysilane fluorinated oligoimides were prepared in two ways, and three crosslinking processes of the trialkoxysilane end groups were studied: thermal self-crosslinking, crosslinking with 1,1,1-tris(4-hydroxyphenyl)ethane, and crosslinking with oxalic acid. The mechanism of the different crosslinking reactions was investigated by Fourier transform infrared spectroscopy and solid-state 29Si NMR. The crosslinked materials showed high thermal stability (T5 > 360 °C in air) and exhibited a low ordinary refractive index (no = 1.516) and low birefringence (Δn = 0.008) at 1.300 μm.

    5. Synthesis of chromophore-embedded polyurethanes for electrooptical materials (pages 2620–2624)

      Zhong Xin, Fumio Sanda and Takeshi Endo

      Version of Record online: 7 JUN 2001 | DOI: 10.1002/pola.1238

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      We carried out the polyaddition of dye-embedded diols with diisocyanates to obtain novel nonlinear optical (NLO) polyurethanes, where the NLO units were embedded in the polymer backbone. The obtained polymers showed high glass-transition temperatures (138–184 °C) and thermal stability (temperature of 10% weight loss under nitrogen = 227–287 °C). The λ maximum of the polymers was 521–556 nm.

    6. Synthesis of an amphiphilic styrenic block copolymer: Polycondensation of dichloromethane and low molecular weight poly(ethylene glycol) in the presence of hydroxypropylated polystyrene-block-polybutadiene (pages 2625–2632)

      Guang-Min Shen, Chien-Chih Chen and Raymond Chien-Chao Tsiang

      Version of Record online: 11 JUN 2001 | DOI: 10.1002/pola.1239

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      An amphiphilic styrenic block copolymer, polystyrene-block-polybutadiene-block-poly[oxymethylene-alt-oligo(oxyethylene)], was synthesized through a polycondensation reaction of low molecular weight poly(ethylene glycol) and dichloromethane in the presence of hydroxypropylated polystyrene-block-polybutadiene acting as a monofunctional chain-capping reagent. Although hydroxypropylated polystyrene-block-polybutadiene has insignificant hydrophilicity, its condensation reaction with poly(ethylene glycol) and dichloromethane resulted in an amphiphilic copolymer having a hydrophile–lipophile balance value of 17.2.

    7. Preparation and properties of polybenzoxazine/poly(imide-siloxane) alloys: In situ ring-opening polymerization of benzoxazine in the presence of soluble poly(imide-siloxane)s (pages 2633–2641)

      Tsutomu Takeichi, Tarek Agag and Rachib Zeidam

      Version of Record online: 8 JUN 2001 | DOI: 10.1002/pola.1240

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      Polymer alloys of polybenzoxazine (PBa)/poly(imide-siloxane) were prepared by the blending of benzoxazine monomer (Ba) and soluble poly(imide-siloxane) with or without OH groups followed by the thermal curing of Ba. The presence of poly(imide-siloxane)s lowered the temperature for the ring-opening reaction of Ba. In addition to the glass-transition temperature (Tg) of polydimethylsiloxane in a lower temperature range, one Tg was observed in a high-temperature range for PBa/PISi(OH) [poly(imide-siloxane) with hydroxyl functionalities] and two Tg's were observed for PBa/PISi [poly(imide-siloxane) without hydroxyl functionalities] due to the formation of AB-crosslinked polymer and semi-interpenetrating networks, respectively. In both cases, the Tg based on PBa increased with the incorporation of poly(imide-siloxane)s. The toughness and thermal stability of PBa were also enhanced by the incorporation of poly(imide-siloxane)s.

    8. Synthesis and characterization of nonaqueous dispersion particles with photolabile α-heptadecylphenacyl ester stabilizer chains (pages 2642–2657)

      Chunlin Zhou, Mitchell A. Winnik and Tze-Chi Jao

      Version of Record online: 8 JUN 2001 | DOI: 10.1002/pola.1241

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      We describe the synthesis and characterization of core–shell nanoparticles with photolabile stabilizer chains at the surface. These particles can be dispersed in common aliphatic hydrocarbon solvents to yield colloidal dispersions. Under irradiation with light at 300–320 nm, the stabilizer chains are cleaved, and the particles flocculate.

    9. Various silicon-containing polymers with Si(H)[BOND]C[TRIPLE BOND]C units (pages 2658–2669)

      Masayoshi Itoh, Kenji Iwata, Jun-Ichi Ishikawa, Hiroshi Sukawa, Hideaki Kimura and Koichi Okita

      Version of Record online: 11 JUN 2001 | DOI: 10.1002/pola.1242

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      Nine new kinds of thermosetting polymers with the Si(H)[BOND]C[TRIPLE BOND]C unit were synthesized by dehydrogenative polycondensation reactions of hydrosilanes with diethynyl compounds in the presence of a magnesia catalyst. The polymer [BOND][BOND]SiH2[BOND]C[TRIPLE BOND]C[BOND]C6H4[BOND]C[TRIPLE BOND]C[BOND][BOND] showed the highest thermal stability (temperature of 5% weight loss = 930 °C, residue at 1000 °C = 94%). The correlation between the stabilities and the polymer structures are discussed.

    10. Well-controlled radical copolymerization of styrene with 2-[(perfluorononenyl)oxy] ethyl methacrylate and characterization of its copolymers (pages 2670–2676)

      Zhaobin Zhang, Shengkang Ying, Qinlai Zhang and Xudong Xu

      Version of Record online: 12 JUN 2001 | DOI: 10.1002/pola.1243

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      The Cu(I)-complex-mediated living/controlled radical copolymerization of styrene with 2-[(perfluorononenyl)oxy] ethyl methacrylate was performed in benzotrifluoride at 100 °C with 1-bromoethyl benzene as an initiator. Well-defined fluorinated random copolymers with controlled compositions and molecular weights, narrow polydispersities, and low surface energies were prepared and characterized with gel permeation chromatography, 1H NMR, Fourier transform infrared, differential scanning calorimetry, and contact-angle measurements.

  3. Note

    1. Top of page
    2. Highlights
    3. Articles
    4. Note
    1. You have free access to this content
      Theoretical synthesis of poly-(2-hydroxyethylmethacrylate) by uniform localization of molecular orbitals calculation (pages 2677–2682)

      Jong-Too Kim, Myung-Jae Lee, Ui-Rak Kim, Manabu Kimura, Yuriko Aoki and Akira Imamura

      Version of Record online: 14 JUN 2001 | DOI: 10.1002/pola.1244

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      The theoretical synthesis of poly-(2-hydroxyethylmethacrylate) P(HEMA) was carried out by the elongation method. The electronic structure and total energy of the syndiotactic and isotactic P(HEMA) were calculated by uniform localization of molecular orbital calculation. The calculated results are compared with the experimental data of P(HEMA).

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