Birefringence and stress relaxation in styrene–butadiene copolymer
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چکیده
منابع مشابه
Stress, birefringence, and conformational relaxation of an initially straight stiff bead-rod polymer.
The stress and optical relaxation of an initially straight stiff polymer chain are studied through Brownian dynamics simulations (based on a semiflexible bead-rod model) covering a broad range of time scales and polymer lengths. The strong stress component sigma11 (where "1" is the direction of the original alignment) is shown to be associated with the chain's longitudinal relaxation while the ...
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The relationship between structural relaxation on molecular length scales and macroscopic stress relaxation was explored in a disordered block-copolymer melt. Experiments show that the structural relaxation time, measured by x-ray photon correlation spectroscopy is larger than the terminal stress relaxation time, measured by rheology, by factors as large as 100. We demonstrate that the structur...
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Even scientific grade optical glasses show birefringence when small external forces are applied to the sample. Stress-induced birefringence can be particularly detrimental to the state of polarization of light when a laser beam is transmitted through the glass. This is especially the case for glass windows of a vacuum chamber. Since compensation of spatially inhomogeneous birefringence is extre...
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ژورنال
عنوان ژورنال: Journal of Polymer Science: Polymer Physics Edition
سال: 1977
ISSN: 0098-1273,1542-9385
DOI: 10.1002/pol.1977.180151115