Intrinsic Birefringence of Poly (L-lactic acid)

Autor:	Yasuo Gotoh, Yutaka Ohkoshi, Hirohiko Shirai, Masanobu Nagura
Rok vydání:	1999
Předmět:	Poly l lactic acid Birefringence Materials science Physics::Optics Value (computer science) Thermodynamics General Medicine Crystal structure Affine deformation Crystal Crystallography Polarizability High Energy Physics::Experiment Fiber
Zdroj:	Sen'i Gakkaishi. 55:21-27
ISSN:	1884-2259 0037-9875
Popis:	The intrinsic birefringence value of Poly (L-lactic acid) was estimated experimentally for the drawn and annealed fiber, in which almost all of the crystals involved are the α-form. The value 0.030-0.033 was obtained using Stein's formula by substituting the results of structural analysis for highly drawn and annealed samples. The extrapolated value 0.030 was also obtained by assuming the affine deformation. On the other hand, as the intrinsic birefringence value of the α-form crystal, -0.013 was also obtained by summation of bond polarizability using crystal structure data. The experimental value is more believable because the contribution of convalent bond alone was included in the calculation
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::16e3d0eb3f3f8ce78d311ad5fb145245 https://doi.org/10.2115/fiber.55.21 Zobrazit plný text záznamu