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Science 10 October 1969:
Vol. 166. no. 3902, pp. 227 - 228
DOI: 10.1126/science.166.3902.227
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Articles

Massive Internal Fracture of an Amorphous Polyester

Ioannis V. Yannas 1

1 Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge 02139

When amorphious polyethylene terephthalate is subjected to a tensile load of 2 to 4 x 108 dynes per square centimeter wthin the approximate temperature range 40°to 70°C, an unusual optical effect occurs. The transparent polymer film is suddenly transformed into a brilliantly reflecting strip with the luster of silver. Extensive formation of voids accounts for the unorthodox behavior.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)