Impact modification of SAN using NR-g-SAN copolymers |
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Authors: | Benny George S N Maiti I K Varma |
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Affiliation: | (1) Rubber Research Institute of India, Kottayam, Kerala, 686 009, India;(2) Centre for Polymer Science and Engineering, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi, 110 016, India |
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Abstract: | The paper demonstrates the efficacy of natural rubber-g-poly (styrene-co-acrylonitrile) (NR-g-SAN) copolymers as impact modifier
for SAN. The impact behaviour of SAN /NR-g-SAN blends were studied as a function of cross-link density of NR, percent grafting,
rubber content in the blend and the AN content in the grafted chain. The cross-link density of NR had no significant effect
on impact strength of the blends whereas increase in percent grafting (PG) of the rubber significantly improved the impact
strength. Thus the impact strength increased four times when the PG of the rubber was increased from 34.2 to 65%. Further
increase in PG decreased the impact strength. Similar trend was observed on increase in the rubber content, the maximum impact
strength was observed at 20% rubber. The impact strength also depended on the acrylonitrile content of the grafted chain.
Tensile and flexural strength and modulus of these blends were not influenced by PG and AN content in the grafted chain whereas
these properties decreased with the increase in the rubber content. Scanning electron microscopic studies of the impact fractured
surfaces showed cavitation of rubber particles and craze induced matrix deformation. Dynamic mechanical studies confirmed
the two-phase structure of these blends. |
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