Optical properties and structure of the surface layers of polyesterurethanes

Autor:	V.K. Turkov, M.I. Koryakina, A.Ye. Grishchenko, A.Ye. Nesterov, N.A. Lipatnikov
Rok vydání:	1990
Předmět:	chemistry.chemical_classification Surface (mathematics) Materials science Birefringence Molecular model business.industry Transition temperature General Engineering Polymer Matrix (mathematics) Optics chemistry Surface layer Composite material Anisotropy business
Zdroj:	Polymer Science U.S.S.R.. 32:965-969
ISSN:	0032-3950
DOI:	10.1016/0032-3950(90)90233-v
Popis:	The birefringence of polyesterurethane films when polarized light is passed at an angle to the film surface has been investigated. The thickness of the optically anisotropic surface layer has been evaluated. Molecular fragments in the surface layers are oriented mainly normally to the film surface. It was found that the optical anisotropy of the surface layers increases in the process of heating the polymers at 100–140°C. These effects are explained by a molecular model according to which rigid blocks of the polyesterurethanes form domains immersed in a matrix consisting of flexible polyfurite chains. The extremal character of curves of the transition temperature to the high-elastic state, and of plots of the surface birefringence versus the number of rigid blocks in the copolyurethane is related to the degree of orientational order of rigid blocks in the domains.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6b9090a612a12f206b81b99fcf305258 https://doi.org/10.1016/0032-3950(90)90233-v Zobrazit plný text záznamu