ISSN:1042-7147    

DOI:10.1002/pat.1990.220010101

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

ISSN:1042-7147    

DOI:10.1002/pat.1990.220010102

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractMiscibility enhancement of ionomer/ionomer and ionomer/polymeric acid systems is studied on the polymer pairs of poly(styrene‐co‐tetramethyl ammonium styrenesulfonate)/poly(ethyl acrylate‐co‐N‐methyl‐4‐vinylpyridinium iodide) and poly(styrene‐co‐styrenesulfonic acid)/poly(ethyl acrylate‐co‐N‐methyl‐4‐vinylpyridinium iodide). NMR and dynamic mechanical results show that in these blends direct macroion–macroion interaction can be achieved with the elimination of microcounterions from the polymer chains. Ion‐ion attraction leads to a miscibility enhancement comparable to that of the previously reported proton transfer blends; a miscible blend is obtained with ca.

ISSN:1042-7147    

DOI:10.1002/pat.1990.220010103

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractWhen a water‐swollen polyelectrolyte gel is interposed between a pair of electrodes and DC current is applied, the gel undergoes electro‐chemomechanical contraction and concomitant water exudation both in water and in the air. In order to clarify the mechanism of the phenomenon, contractile experiments were carried out under various conditions and led to the conclusion that the contraction is essentially associated with electrically driven movement of hydrated micro‐ and macroions in the gel (electrokinetic pro

ISSN:1042-7147    

DOI:10.1002/pat.1990.220010104

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractWe have been investigating the crystallization behavior of the phospholipid amphiphile, 1,2 bis (10, 12‐tricosadiynol)‐sn‐glycero‐3‐phosphocholine, DC8,9PC, which forms both vesicles and hollow tubules as well as Langmuir Blodgett monolayers and multilayers. This material has polymerizable diacetylene groups in equivalent positions on the two hydrocarbon tails. The direct crystallization from solution of this amphiphile has been studied using different solvent mixtures and temperatures. The Langmuir Blodgett technique was also used to compress and orient th

ISSN:1042-7147    

DOI:10.1002/pat.1990.220010105

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractA series of coin‐type lithium secondary batteries with polyaniline positive electrodes was developed and commercialized which might be not only the first practical polymer battery but also the first industrial application of conducting polymers. Performances of the commercialized batteries were described in detail in this paper.In order to achieve the development the most important thing was the optimization of molecular structure and molphology of multiguise polyaniline as the electrode material. According to the findings obtained during the development, polyaniline sheet was prepared substantially to be composed of imino‐1,4‐phenylene (IP) and the cation radical of IP (IP+) by the novel procedure, not to include quinoid configuration of polyaniline (NP) which was proved to be electrochemically inactive in non‐aqueous

ISSN:1042-7147    

DOI:10.1002/pat.1990.220010106

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractDynamic mechanical measurements in tension and torsion on oriented tapes and monofilaments of a range of liquid crystalline polyesters have been combined with dielectric measurements to obtain a molecular understanding of the relaxation processes.This paper extends our previous work [1,2,3] on polyesters of hydroxybenzoic acid (HBA) and hydroxynaphthoic acid (HNA) to related polymers containing dihydroxynaphthalene (DHN) and terephthalic acid (TPA) or biphenyl (BP) and TPA in place of the HNA. It confirms the association of the β and γ processes with naphthyl and phenyl moieties but shows that the processes cannot be due simply to the independent motions of single unit

ISSN:1042-7147    

DOI:10.1002/pat.1990.220010107

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractVarious aramids having a cyano group on the diamine ring were synthesized. Aramids containing a cyano group ortho to the amide bond underwent thermal degradation via a two step mechanism, whereas those containing a cyano group meta to the amide bond did not. The first step represented the loss of HCN resulting in benzoxazole polymers, which degraded further in the second stage producing high char yield at 900°C. The thermal studied of copolyamides fromm‐phenylenediamine, 2,4‐diaminobenzonitrile, and iso‐ or terephthaloyl chloride showed that as the mole fraction of 2,4‐DABN increased the initial decomposition temperature decreased, but the char yield and glass transition temperature increased gradually from the poly(1,3‐phenylene isophthalamide) to the polycyanamide homopolymer. To confirm the nucleophilic displacement reaction mechanism rather than isomerization cyclization suggested by Barashkovet al.for aramids with the cyano group ortho to the amide bond, a high‐temperature cell attached to a FT‐IR spectrometer were employed. Model compound studies also showed evidence for the benzoxazole

ISSN:1042-7147    

DOI:10.1002/pat.1990.220010108

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractNonlinear optical susceptibility χ(3)of polydiacetylenes has been evaluated by third harmonic generation. First, in order to obtain the χ(3)tensor component along the polymer main chain, thin single crystals of two representative polydiacetylenes, poly‐PTS and poly‐DCHD were made by utilization of sampling technique in microscopy, i.e., the microtome cutting of single crystal embedded in plastic resin. The THG intensity observed was proportional to cos8θ, where θ was the angle between the polymer main chain and the polarization of laser light. The χ(3)value of poly‐DCHD was found to be rather higher than that of poly‐PTS. At resonant wavelength of 1.97 μm, the χ(3)of poly‐DCHD attained 8 x 10−10esu. Furthermore, it was confirmed that when geometrical correction were properly made, the χ(3)obtained from polycrystalline thin film of poly‐PTS agreed well with that from thin single crystals. Secondary, regarding poly‐diphenyldiacetylene derivatives, it was found that the π‐conjugation between the polymer main chain and aromatic substituents was effective on the improvement of χ(3)values. The χ(3)magnitudes of poly‐BTFP and poly‐DFMP reflect well the dihedral angles between polymer main chain and the phenyl substituents (58° for poly‐BTFP and 67° for poly‐DFMP) as a measure of π‐conjugation. Especially, at nonresonant region of 2.1 μm the χ(3)of poly‐BTFP i

ISSN:1042-7147    

DOI:10.1002/pat.1990.220010109

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY

摘要:

AbstractBlends in which both of the component materials are capable of forming liquid crystalline phases are considered in the present work. Solid‐state characterization data are presented that suggest that chemical reaction is not a dominant event when two such materials are blended in the melt. Also, ideas of small‐molecule liquid crystal mixing are shown to be not applicable to describe the behavior of this system. A formalism for describing blends of liquid crystal polymers, based on Windle's sequence matching arguments, is propo

ISSN:1042-7147    

DOI:10.1002/pat.1990.220010110

出版商:John Wiley&Sons, Ltd.    

年代:1990

数据来源: WILEY