摘要:

AbstractA novel thermally stable and semiconducting polyheterocycle, poly(1,3,4‐oxadiazole amine), was synthesized from 2‐(p‐aminophenyl)‐1,3,4‐oxadiazolin‐5‐one via ring‐opening. The polymer is a new class of ordered alternating copoly(aniline) containing 1,3,4‐oxadiazole heterocyclic units. The polymer is highly thermally stable and exhibits no weight loss up to 370°C in air. Its electric conductivity is less than 10−10S · cm−1at ambient temperature, but markedly increases to 6,5 · 10−7S ·

ISSN:1022-1336    

DOI:10.1002/marc.1996.030171001

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractNew amphiphiles with reactive tosylate groups and ionic sulfuric acid half esters based on the rod‐like polysaccharide cellulose were designed via homogeneous tosylation followed by sulfation with the SO3‐pyridine complex inN,N‐dimethylacetamide. At appropriate degrees of functionalization the polymers are soluble both in water and dimethyl sulfoxide, and they are promising starting materials for self‐organizing

ISSN:1022-1336    

DOI:10.1002/marc.1996.030171002

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractThe influence of parameters such as styrene dilution and active site concentration on the polymerization of styrene in the presence of a di‐tert‐butyl nitroxide adduct (A‐T) was examined. It is confirmed that the rate of styrene polymerization is independent of A‐T concentration, with no monomer dilution effect. An increase in radical concentration generated in the medium leads to faster propagation, but the molecular weight of the polymers formed is alway controlled by the A‐T conc

ISSN:1022-1336    

DOI:10.1002/marc.1996.030171003

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractIn this communication we report the synthesis and the efficient polymerization of a PPV trimer, 4‐tert‐buty1‐4′‐(4‐vinylstyryl)‐trans‐stilbene. By using the TEMPO (2,2,6,6‐tetramethylpiperidin‐1‐yloxy)‐mediated free‐radical polymerization method, the corresponding polymer was obtained in high yields, with a fair molecular weight and a small polydispersity. The presence of phenylenevinylene units in the side chains of the polymer gives rise to efficient blue fluorescence which makes the material suitable for li

ISSN:1022-1336    

DOI:10.1002/marc.1996.030171004

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractNew photo‐crosslinkable side‐chain liquid‐crystalline methacrylate polymers comprisingm‐[4′‐(n‐cinnamoyloxyalkoxy)biphenyl‐4‐yloxy]alkyl groups (m,n= 2, 6) were synthesized. All polymers exhibit a nematic liquid‐crystalline phase depending on the spacer length(5a–5d). Aligned thin films could be obtained using a rubbed polyimide‐coated substrate, and they could be photo‐crosslinked without change in the aligned structure. The photo‐crosslinked film of5d(m=n= 6) showed a s

ISSN:1022-1336    

DOI:10.1002/marc.1996.030171005

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractNovel copolymers consisting of 3,3,3‐trifluoro‐1,2‐epoxypropane (TFEP) andN‐phenylmaleimide (PMI) units were prepared by the copolymerization of TFEP with PMI initiated with an organozinc compound. Using [Zn(OCH3)2· (C2H5ZnOCH3)4] as an initiator, the copolymer chains consisted mainly of TFEP‐TFEP sequences. The TFEP‐PMI sequence content in the copolymer chains was small. On the other hand, using (C2H5ZnOCH3)4as an initiator, only low molecular weight copolymers were formed. Those copolymers were suggested to have block structure, poly(TFEP)‐block‐poly(PMI), by the19F NMR analysis. The copolymers showed higher thermostability

ISSN:1022-1336    

DOI:10.1002/marc.1996.030171006

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractMesoionic poly(1,1′‐(1,3‐phenylene)‐3,3′‐(1,4‐phenylene)‐bis(5‐decyl‐2‐decylthio‐4,6‐dioxo‐1,3‐diazine)) (6) was prepared by cyclisation of the isothiourea component of poly(1,1′‐(1,3‐phenylene)‐3,3′‐(1,4‐phenylene)‐bis(2‐decylisothiourea)) (4) with decylmalonic acid (5) by use of dicyclohexylcarbodiimide (DCC). Polymer4was obtained by polymer analogous alkylation of poly(1,1′‐(1,3‐phenylene)‐3,3′‐(1,4‐phenylene)‐bisthiourea) (3). For comparison of spectroscopic data, 5‐butyl‐2‐propylthio‐4,6‐dioxo‐1,3‐di

ISSN:1022-1336    

DOI:10.1002/marc.1996.030171007

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractAn efficient synthesis of a cyclodextrin polymer by a polymer‐analogous reaction of lithium β‐cyclodextrinate with poly[(N‐vinyl‐2‐pyrrolidinone)‐co‐(maleic anhydride)] is described. Because cyclodextrin polymer is highly water‐soluble, its binding of guests, like 1‐adamantanamine and l‐adamantanecarboxylic acid, could be investigated by titration microcalorimetry. All cyclodextrin moieties are accessible by the guest within the polymer, but binding constants are slightly lower than those for native β‐cyclodextrin. Binding constants are influenced by Coulomb interactions between the guest and the a

ISSN:1022-1336    

DOI:10.1002/marc.1996.030171008

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractThree new amphiphilic phospholipid diols containing hydrophilic phosphatidylcholine analogues in the main chains and hydrophobic octadecyl, hexadecyl or dodecyl alkyl groups in the side chains were synthesized. The typical phospholipid diol based on an octadecyl group was further reacted with diisocyanates such as hexamethylene diisocyanate (HDI), 2,4‐tolylene diisocyanate (TDI) and 4,4′‐methylenediphenyl diisocyanate (MDI), respectively. Preliminary studies suggest that polyurethane based on MDI shows a viscosity behavior similar to common polyelectrolytes and exhibits a therm decomposition peak at 244°C due to the phospholipid moiety and a melting point at

ISSN:1022-1336    

DOI:10.1002/marc.1996.030171009

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY

摘要:

AbstractAn almost alternating stereoregular copolymer can be obtained by copolymerizing ethylene and styrene with the catalyst ethylenebis(1‐indenyl)zirconium dichloride activated by methylaluminoxane at −25°C. The regular microstructure pointed out by the NMR spectrum allows the copolymer to crystallize as shown by calorimetric and X‐ray diffraction measur

ISSN:1022-1336    

DOI:10.1002/marc.1996.030171010

出版商:Hüthig&Wepf Verlag    

年代:1996

数据来源: WILEY