2. Why does a transparent polymer turn opaque in the necked region when tested in tension.

Answered: Why does a transparent polymer turn…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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2. Why does a transparent polymer turn opaque in the necked region when tested in tension.

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Transparent polymers are usually opaque because of light scattering on the numerous boundaries between the crystalline and amorphous regions. The density of such boundaries is lower and consequentially, the transparency is higher - either for low (amorphous polymer) or high (crystalline) degree of crystallinity.

When a polymer subjected to tension and a neck forms it is due to alignment of polymer chains and local strengthening in the neck region ( within the neck, chains become oriented means chain axes become aligned parallel to the elongation direction which leads to localized strengthening) . It is also called conditioning.