摘要:

AbstractThe structure of poly(L‐lysine) containing 44% azobenzene units in the side chain was studied by X‐ray diffraction between room temperature and 150°C. The polymer exhibits a mesomorphic structure of the smectic A1 type. In this structure, stable at least until 150°C, each smectic layer of thicknessdresults from the superposition of two layers: one of thicknessdAcontains the free lysine side chains, the other of thicknessdBcontains the azobenzene modified lysine side chains and the polypeptide main chains, that in their planes are arranged as in the “antiparallel” β‐structure classical for

ISSN:1022-1336    

DOI:10.1002/marc.1996.030170801

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractEnzymatic oxidative polymerization of 4,4′‐biphenyldiol was performed in an aqueous organic solvent using horseradish peroxidase as catalyst. In the polymerization using a mixture of 1,4‐dioxane and phosphate buffer (pH 7.0) (80:20 vol‐%) as solvent, the monomer was quantitatively consumed to give powdery polymeric materials in a high yield. The resulting polymer is soluble in polar solvents such asN,N‐dimethylformamide, dimethyl sulfoxide, and acetone. The molecular weight of the methylated product is 7.3 × 103. The polymer exhibits high thermal stability unde

ISSN:1022-1336    

DOI:10.1002/marc.1996.030170802

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractA polyrotaxane consisting of many β‐cyclodextrins (β‐CDs) and a triblock copolymer of poly(ethylene glycol) (PEG) and poly(propylene glycol) (PPG) capped with bulky end‐groups was synthesized as a model of stimuli‐responsive supramolecules for nanoscale devices. The polyrotaxane was reversibly soluble‐insoluble in water in response to temperature. This was achieved through the assembled and dispersed states of β‐CDs along the block copolymer. It is considered that intermolecular hydrogen bondings of β‐CDs, as well as the PEG segment length of the copoloymer, are predominant factors for regulating such thermally switchable behavior of

ISSN:1022-1336    

DOI:10.1002/marc.1996.030170803

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractThe synthesis of styrene monomers5(G‐1,2,3) with Fréchet‐type dendrons of the first, second and third generation, and their radically initiated polymerization to result in high molecular weight dendrimers6(G‐1,2,3) are reported. First light‐scattering investigations using6(G‐2) show that this polymer is best described as a Gaus

ISSN:1022-1336    

DOI:10.1002/marc.1996.030170804

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractThe polymerizability of an azastyrene derivative, 2,6‐diisopropyl‐N‐methyleneaniline (DiPMAn), was studied. Although DiPMAn could not be polymerized by radical and anionic initiators, it was polymerized with cationic initiators, such as trifluoroacetic acid (TFA), TiCl4‐TFA, and SnCl4‐TFA. The polymer is formed by 1,6‐addition with electrophilic substitution of an activated monomer inpara‐position of the

ISSN:1022-1336    

DOI:10.1002/marc.1996.030170805

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractShape memory polymers were prepared by copolymerizing stearyl acrylate and methyl acrylate. The principle of this shape memory effect is based on reversible order‐disorder transition of crystalline aggregates of stearyl moieties. A specific feature of this type of shape memory copolymer is that the transition temperature at which the polymer abruptly becomes soft and deforms can be controlled by changing the monomer composition, which enables one to adjust the shape memory effect at a desired temperature. Mechanism and process of the shape memory behaviors were discusse

ISSN:1022-1336    

DOI:10.1002/marc.1996.030170806

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractThe surface‐assisted alignment of a nematic liquid crystal yields a persistent ordered structure upon cationic photopolymerization of liquid‐crystalline epoxides. Linearly polarized light irradiation of a photocrosslinkable polymer containing azobenzene moieties played a crucial role in this procedure since the photoinduced alignment is not deteriorated by heating for polymerizat

ISSN:1022-1336    

DOI:10.1002/marc.1996.030170807

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractRegioselective oligocondensation of cholic acid in the 3‐position was achieved in organic solution in the presence of a lipase fromCandida antarctica. Furthermore, a mixture of cholic acid, 11‐methacryloylaminoundecanoic acid and the lipase resulted in the production of a radically polymerizable oligo(cholic acid ester) bearing exactly one methacrylic end group. This new monomer was polymerized radically yielding the corresponding comb‐polymers bearing several cholic acid esters at the end of the side c

ISSN:1022-1336    

DOI:10.1002/marc.1996.030170808

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractSoluble propene/ethene/CO terpolymers (EPEC) with ultrahigh molecular weight (up to 1.2 × 106g/mol) were prepared by the use of dicationic palladium(II) phosphine catalysts and an optimized amount of water as activator. When the molar ratio of ethene/CO to propene/CO is below 50 mol‐%, the terpolymers are thermoplastic elastomers with excellent properties. Above this ratio the terpolymers are crystalline thermoplastics. The ultrahigh molecular weight elastomers are highly soluble in organic solvents such as CH2Cl2and CHC

ISSN:1022-1336    

DOI:10.1002/marc.1996.030170809

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractA new morphology of ternary ABC triblock copolymers is presented which results from the asymmetric interaction between a centre block (poly(ethylene‐co‐butene)) to different end blocks (polystyrene and poly(methyl methacrylate)). This morphology with the appearance of a “knitting pattern” can be described as an intermediate of a morphology of A, B and C lamellae and a morphology of A and C lamellae with B cylinders at the A/C in

ISSN:1022-1336    

DOI:10.1002/marc.1996.030170810

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY