Isotactic Polypropylene Toughened by Polybutene-based Elastomers
A series of long-chain branching polybutene-based elastomers(PBEs)were successfully prepared by incorporating distinct comonomers of 1-dodecene(C12),1-hexadecene(C16),and 1-icosaene(C20).The improved elongation at break of PBE could exceed 5000％,and the best elastic recovery of PBE reached 88.9％.Moreover,PBEs were blended with isotactic polypropylene(iPP)to improve the material toughness.The effects of additional,side chain length,and comonomer incorporation of PBEs on the toughening effect were systematically studied.The results showed that for PBE-C 16(52.3)incorporated 52.3 mol％1-hexadecene comonomers,the addition of 5 wt％PBE increased the elongation at break of iPP blend by more than 8 times to 900％and its impact strength increased by 2 times to 15.3 kJ/m2.The high elastic recovery of PBE and its small dispersed phase size are beneficial to the improvement on toughness of the iPP blend material.This work provides a simple and effective method for obtaining iPP blend material with the improved toughness.
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