2002 Fiscal Year Final Research Report Summary

Molecular Rheology of Polymer Solids: Evaluation of Internal Strain by Birefringence

Research Project

Project/Area Number	13650952
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	高分子構造・物性(含繊維)
Research Institution	KYOTO UNIVERSITY
Principal Investigator	INOUE Tadashi Kyoto University,Insitite for Chmeical Reserch lnst., 化学研究所, 助手 (80201937)
Project Period (FY)	2001 – 2002
Keywords	Strain Birefringence / Viscoelasticity / Modified Stress-Optical Rule / Glass Transition / Molecular Rheology / Subrelaxation / Pol ycarbonate
Research Abstract	Internal strain of polymer solids were estimated by birefringence measurement to elucidatate molecular origin of sub-relaxations. Dynamic birefringence and dynamic viscoelasticity of bisphenol A polycarbonate were simultaneously measured over a wide range of temperature from - 150 to 180℃. Large dispersion observed for the complex Young's modulus was found to be inactive for the complex strain-optical coefficients, which is the ratio of birefringence to the strain. The present result indicates that dispersion cannot be attributed to the reorientation of any atomic groups, but to the relaxation of internal strain by translational motions. Dynamic birefringence was anticipated to be a new experimental method for the sub relaxation of glassy polymers.