Journal of Polymer Science Part A: Polymer Chemistry

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

15 January 2002

Volume 40, Issue 2

Pages 179–268

  1. Highlights

    1. Top of page
    2. Highlights
    3. Articles
    4. Research Articles
    1. You have free access to this content
      Polymer science with transition metals and main group elements: Towards functional, supramolecular inorganic polymeric materials (pages 179–191)

      Ian Manners

      Article first published online: 29 NOV 2001 | DOI: 10.1002/pola.10069

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      Inorganic polymers represent a relatively unexplored class of materials. This article focusses on recent research in the author's lab that has targeted the development of new and controlled routes to inorganic polymers and their subsequent use to form supramolecular materials as well as studies of their properties and applications. The use of ring-opening polymerization (ROP) processes to form, e.g., polyferrocenylsilanes and transition-metal-catalyzed polycondensation approaches to synthesize polyphosphinoboranes are illustrated. Controlled ROP procedures have been developed that allow access to polyferrocene block copolymers that self-assemble into interesting nanoscopic architectures such as cylinders and superstructures such as flowers. The future prospects for inorganic polymer science are also discussed.

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      Polymerization of cyclic imino ethers: From its discovery to the present state of the art (pages 192–209)

      Shiro Kobayashi and Hiroshi Uyama

      Article first published online: 30 NOV 2001 | DOI: 10.1002/pola.10090

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      Topics concerning the cationic ring-opening polymerization of cyclic imino ethers and functional material production based on the resulting polymers are reviewed. The isomerization polymerization of cyclic imino ethers takes place via cationic initiators. 2-Substituted 2-oxazolines polymerize in a living fashion to produce precisely controlled polymeric materials. Functional polymers based on the unique properties of the product polymers from 2-oxazolines, such as polymeric nonionic surfactants, compatibilizers, hydrogels, and supramolecular assemblies, have been developed.

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      Cyanocarbons: A classic example of discovery-driven research (pages 210–221)

      Owen W. Webster

      Article first published online: 30 NOV 2001 | DOI: 10.1002/pola.10087

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      The discovery-driven trail of research that led to tetracyanoethylene, tetracyanoethylene oxide, hexacyanobutadiene, pentacyanocyclopentadiene, diimnosuccinonitrile, diaminomaleonitrile, diazodicyanoimidazole, and tetracyanodiithiin is presented.

  2. Articles

    1. Top of page
    2. Highlights
    3. Articles
    4. Research Articles
    1. Photosensitive, self-assembled ultrathin films based on diazoresin and phosphate-containing polyanions (pages 222–228)

      Qi Li, Jianhua Ouyang, Jinyu Chen, Xinsheng Zhao and Weixiao Cao

      Article first published online: 29 NOV 2001 | DOI: 10.1002/pola.10101

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      Photosensitive ultrathin films with phosphate containing polyanions and diazoresin (DR) as polycation were fabricated using self-assembly technique. The phosphate-containing polyanions used are poly(sodium phosphate), phosphorylated poly(vinyl alcohol), and DNA. The fabrication process was monitored by determining the absorbance from DR. The surface morphology of the multilayer film was observed by atomic force microscopy (AFM). Under UV irradiation, a linkage nature between the layers of the film converts from ionic to convalent, as a result, the stability of the film toward polar solvents increases obviously. This kind of film may be interesting in biosensor devices.

  3. Research Articles

    1. Top of page
    2. Highlights
    3. Articles
    4. Research Articles
    1. Preparation of aromatic polyimides highly soluble in conventional solvents (pages 229–234)

      Wei Huang, Deyue Yan, Qinghua Lu and Ping Tao

      Article first published online: 29 NOV 2001 | DOI: 10.1002/pola.10105

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      Several highly soluble polyimides were synthesized from various aromatic tetracarboxylic dianhydrides and an aromatic diamine containing tert-butyl pendent groups [4,4′-methylenebis(2-tert-butylaniline)]. All the polyimides showed excellent solubility in common solvents such as chloroform, tetrahydrofuran, and dioxane at room temperature. The number-average molecular weight ranged from 3.6 × 104 to 1.3 × 105, and the polydispersity index was between 1.9 and 2.5 according to gel permeation chromatography. The glass-transition temperatures were between 213 and 325 °C, and little weight loss was observed up to 450 °C in a nitrogen atmosphere.

    2. Synthesis and electroluminescent studies of blue-emitting copolymers containing phenylene vinylene and oxadiazole moieties in the main chain (pages 235–241)

      Min Zheng, Liming Ding, E. Elif Gürel and Frank E. Karasz

      Article first published online: 29 NOV 2001 | DOI: 10.1002/pola.10095

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      Two statistical copolymers III and IV combining features of the two reference polymers I and II were synthesized by a Wittig reaction with the objective of improving their electron-transport properties and fluorescence quantum yields relative to the alternating block copolymers I and II. External quantum efficiencies of 0.035 and 0.11% were obtained from single-layer devices on the basis of III and IV, respectively, which are higher than those of similar devices using I and II. Single-layer light-emitting diodes using a blend of I and II (4:1 and 1:1 wt/wt) corresponding to the compositions of copolymers III and IV, respectively, were also fabricated for comparison.

    3. Formation of pore-filled microfiltration membranes using a combination of modified interfacial polymerization and grafting (pages 242–250)

      Ronald F. Childs, Junfan Weng, Marcus Kim and James M. Dickson

      Article first published online: 4 DEC 2001 | DOI: 10.1002/pola.10108

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      Polyethylenimine (PEI) and crosslinking into place. The coated PEI provided a chemically active surface to which a heat-sensitive initiator could be incorporated. The coated membranes, with the incorporated initiator, were heated in the presence of various vinyl monomers to give grafted, pore-filled membranes.

    4. Synthesis and structure-property relationship of new donor–acceptor-type conjugated monomers and polymers on the basis of thiophene and benzothiadiazole (pages 251–261)

      M. Jayakannan, Paul A. van Hal and René A. J. Janssen

      Article first published online: 4 DEC 2001 | DOI: 10.1002/pola.10107

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      Two novel high molecular weight regioregular head-to-head and tail-to-tail polymers poly[4,7-bis(4-octyl-2-thienyl)-2,1,3-benzothiadiazole] (PB4TB) and poly[4,7-bis(3-octyl-2-thienyl)-2,1,3-benzothiadiazole] (PB3TB) were prepared via FeCl3-mediated oxidative polymerization. Their optical and electrochemical properties were studied in relation to the substitution pattern and compared with an unsubstituted analogue that exhibits a low band gap.

    5. Synthesis and characterization of soluble polyimides derived from 2,2′-Bis(3,4-dicarboxyphenoxy)-9,9′-spirobifluorene dianhydride (pages 262–268)

      D. Sahadeva Reddy, Ching-Fong Shu and Fang-Iy Wu

      Article first published online: 4 DEC 2001 | DOI: 10.1002/pola.10103

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      Spirobifluorene units were introduced into polyimide backbones by the polycondensation of 2,2′-bis(3,4-dicarboxyphenoxy)-9,9′-spirobifluorene dianhydride with a variety of diamines. Excellent solubility in common organic solvents at room temperature, good optical transparency, and high thermal stability are the prominent characteristic features of these new polymers, which can be attributed to the presence of spiro-fused orthogonal bifluorene segments along the polymer chain. The glass-transition temperatures of the polyimides were 240–293 °C, and the 5% weight-loss temperatures were greater than 500 °C.

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