Crystallization and Mechanical Properties of Recycled Poly(ethylene terephthalate) Toughened by Styrene–Ethylene/Butylenes–Styrene Elastomer |
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Authors: | Yue Zhang Hongsheng Zhang Luping Ni Qilin Zhou Weihong Guo and Chifei Wu |
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Institution: | (1) School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, 200237 Shanghai, China; |
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Abstract: | Recycled poly(ethylene terephthalate) (R-PET) was blended with 15–30 wt% of styrene–ethylene/butylenes–styrene (SEBS) block
copolymer and maleic anhydride grafted SEBS (SEBS-g-MA). Effects of nucleation and toughening of the elastomers were evaluated
systematically by study of morphology, crystallization, thermal and mechanical properties of the blend. The addition of 30 wt%
SEBS promoted the formation of co-continuous structure of the blend and caused the fracture mechanism to change from strain
softening to strain hardening. Addition of SEBS-g-MA resulted in significant modification of phase morphology and obviously
improved the impact strength. The compatibilization reaction of PET with SEBS-g-MA accelerated the crystallization of PET
and increased the crystallinity. The shifts in glass transition temperature of PET towards that of SEBS-g-MA and the higher
modulus for R-PET/SEBS-g-MA (70/30) blend found by DMA are also indications of better interactions under the conditions of
compatibilization and interpenetrating structure. |
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