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Craze fibril extension ratio measurements in glassy block copolymers |
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| Authors: | C Creton E J Kramer G Hadziioannou |
| Institution: | (1) Department of Materials Science and Engineering, Cornell University, Bard Hall, 14853 Ithaca, New York, USA;(2) the Materials Science Center, Cornell University, Bard Hall, 14853 Ithaca, New York, USA;(3) IBM Almaden Research Center, San Jose, California, USA;(4) Present address: Dept. of Chemistry, University of Groningen, Nijenborgh 16, 9747 AG Groningen, The Netherlands |
| Abstract: | The extension ratios of crazes in triblock copolymer films of poly(2-vinylpyridine)-polystyrene-poly(2-vinylpyridine) PVP-PS-PVP] which had lamellar microphase domain structure were measured by transmission electron microscopy. The extension ratio when the lamellae were oriented parallel to the craze fibril direction was always greater than that when the lamellae were oriented perpendicular to this direction, reflecting the stretching of the chains of the block copolymer in a direction normal to the interfaces of the lamellar domains. |
| Keywords: | Craze triblock copolymer morphology chain stretching lamellae |
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