摘要:

AbstractA series of chiral copoly(ester‐imide)s was prepared by polycondensation ofN‐(4‐carboxy‐phenyl)trimellitimide with mixtures of isosorbide and phenylhydroquinone. All copolyesters are non‐crystalline. They form a cholesteric melt, when containing more than 50 mol‐% of phenyl‐hydroquinone. Containing 5 or 10 mol‐% of isosorbide a “Grand‐Jean” texture is detected above 300°C a

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160401

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractWe describe the synthesis of new rigid rod polymers possessing a backbone of silicon phthalo‐cyanine units and stiff 4,4′‐dioxybiphenyl or 2,6‐dioxynaphthalene spacers. These modified phthalocyaninato‐polysiloxane derivatives are characterised by mass, absorption and13C‐CPMAS spectroscopies, differential scanning calorimetry and X‐ray powder diffractometry. UV/VIS spectra show only slight differences to the corresponding phthalocyanine monomers, which indicates the absence of excited state interactions between the chromophores within the pol

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160402

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractThe short‐period polymerization method was successfully applied to the synthesis of a novel diblock copolymer, polypropene‐block‐poly(ethylene‐co‐propene). The polymerization was carried out for ca. 0,1 s with a MgCl2‐supported Ziegler catalyst. The copolymers obtained showed unimodal curves in gel‐permeation chromatography without any peak in the low‐molecular‐weight region. After extraction with heptane, the fraction of poly(ethylene‐co‐propene) remained unchanged in the copolymer but disappeared in a commercial so‐called block‐type copolymer. All the results the formation of polypropene‐block‐poly(ethylene‐co‐propene), in which poly(ethylene‐co‐propene)

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160403

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractSeveral new polyurethanes containing cholesterol and phosphatidylcholine analogous moieties were synthesized by addition polymerization of 2‐[bis(2‐hydroxyethyl)methylammonio]ethyl 5‐cholesten‐3β‐yl phosphate (2) with diisocyanates such as hexamethylene diisocyanate (HDI), 2,4‐tolylene diisocyanate (TDI), 4,4′‐methylenediphenyl diisocyanate (MDI) andm‐xylylene diisocyanate (XDI), respectively. They were characterized by their IR and1H NMR spectral data and elemental analyses. Preliminary studies suggest that these polyurethanes show the viscosity behavior of commo

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160404

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractA novel design of a biodegradable carrier for drug delivery was established by constructing a supramolecular assembly of drugs and polymer backbones without any covalent bonds. A biodegradable polyrotaxane was synthesized in which α‐cyclodextrins (α‐CDs) as drug carriers were threaded onto poly(ethylene glycol) chains which then were capped at each chain end byL‐phenylalanine via peptide linkages. The release of α‐CDs was observed only when the terminal peptide linkages wer

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160405

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractTwo kinds of the trisiloxane‐bridged dinuclear titanium metallocene‐type complexes were synthesized. They are monocyclopentadienyl and biscyclopentadienyl dinuclear titanocenes with trisiloxane bridges. The above complexes with modified methylaluminoxane (MMAO) cocatalyst initiate the polymerizations of ethylene and styrene to produce high‐density polyethylene and syndiotactic polystyrene. In addition, a copolymer of ethylene and styrene was obt

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160406

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractThe regiospecificity of isotactic 1‐butene polymerization promoted by typical C2‐symmetric group IV metallocene catalysts was studied by means of13C NMR spectroscopy. In particular, the formation of 1,4 monomer enchainments is discus

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160407

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractThe propagation rate coefficient in free‐radical bulk polymerization of butyl methacrylate has been studied at temperatures between −10°C and 60°C up to a maximum pressure of 2 000 bar. The data were obtained by means of the PLP‐GPC technique which combines pulsed‐laser polymerization with product analysis by gel‐permeation chr

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160408

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractMicrolatex dispersions with ca. 120 m2bipyridine‐functionalized surface per g polymer were synthesized via copolymerization in microemulsion using two new comonomers containing bipyridine groups. The resulting polymer particles were used for binding diverse metal ions in water as well as in organic solvents. Binding of the ions usually occurs intramolecularly. The colloidal characteristics of the dispersions are preserve

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160409

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractA polymer containing dichlorotriazine moiety was prepared readily by the reaction of poly(2,4‐diamino‐6‐vinyl‐1,3,5‐triazine) withtert‐butyl hypochlorite. This polymer oxidizes various primary and secondary alcohols to the corresponding carbonyl compounds under mild conditions, while the reaction of the monomeric analogueN,N′‐dichloroacetoguanamine with alcohols does not proceed. The polymer reagent can be handled easily and recycled

ISSN:1022-1336    

DOI:10.1002/marc.1995.030160410

出版商:Hüthig&Wepf Verlag    

年代:1995

数据来源: WILEY