Development of crystallinity in a semiflexible thermotropic polyurethane. 2. Structure and dynamics

Autor:	Peter J. Stenhouse, Shaw Ling Hsu, Fotis Papadimitrakopoulos, Gerald Smyth, Steve K. Pollack, William J. MacKnight
Rok vydání:	1992
Předmět:	chemistry.chemical_classification Polymers and Plastics Stereochemistry Chemistry Hydrogen bond Mesogen Organic Chemistry Relaxation (NMR) Polymer Thermotropic crystal Inorganic Chemistry Crystallinity chemistry.chemical_compound Crystallography Liquid crystal Materials Chemistry Polyurethane
Zdroj:	Macromolecules. 25:2381-2390
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma00035a014
Popis:	The monotropic liquid-crystalline polyurethane [CONHPh(CH 3 )NHCOO(CH 2 ) 6 OPhPhO(CH 2 ) 6 O] n is studied. The development of crystallinity is found to increase the conformational regularity of the polymer and, in particular, lead to development of two unique conformations of TDI urethane linkage in hydrogen bonding. Secondary relaxation processes involving reorientational motion of the inner hexamethylene spacer carbons, possibly a three-bond conformational jump motion, and the biphenyl mesogen are also identified and correlated with mechanically active relaxation processes
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cd3e5c8215e2d8295003dd2fa93cab63 https://doi.org/10.1021/ma00035a014 Zobrazit plný text záznamu