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Journal of Composite Materials
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The Relationship Between Rheological Behavior and Toughening Mechanism of Toughened Poly(Ethylene Terephthalate)

Yuan Zong

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China

Yongfeng Cheng

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China

Gance Dai

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China, gcdai{at}ecust.edu.cn

Mechanical properties, morphology, and rheological behavior of poly(ethylene terephthalate) (PET) with different compatible agents were studied. The results showed that the addition of ethylene-butylacrylate-glycidyl methacrylate copolymer (PTW) significantly improved the impact-strength property of PET over maleic anhydride grafted polyethylene octene elastomer copolymer (POE-g-MA), whereas silane coupling agent KH570 grafted polyethylene octane elastomer (POE-g-KH570) had no obvious contribution to the toughness of PET. Scanning electron microscopy micrographs indicated that the size of POE-g-MA and PTW particles were smaller that that of POE-g-KH570 and dispersed uniformly due to their interaction with PET. The rheological tests revealed the viscoelastic properties of PET/PTW and PET/POE-g-MA were different from that of PET/POE-g-KH570 ascribed to the high elastic of the compatibilizers and the finely dispersed particle. And it explained that the toughening mechanism of PET toughened system was mostly due to shear yielding.

Key Words: poly(ethylene terephthalate) • compatibilizer • toughness • rheology.

Journal of Composite Materials, Vol. 42, No. 16, 1571-1585 (2008)
DOI: 10.1177/0021998308090829
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