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Fabrication of improved overall properties of poly (ethylene terephthalate) by simultaneous chain extension and crystallization promotion

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Abstract

In order to improve processing performance and mechanical properties, chain extension is commercially employed for poly (ethylene terephthalate) (PET). Poly (phenyl methylene isocyanate) (PMDI) with multi-reactive isocyanate groups (–NCO) is a qualified chain extender. However, the introduction of such compound impairs the crystallization properties of PET. Nucleating agent Surlyn® possesses good dispersion in PET, and it is commonly used to improve the crystallization rate of PET. The results showed that the intrinsic viscosity of PPET, representing PET chain-extended by 1.4 mass% PMDI, was enhanced from 0.60 dL g−1 of PET to 1.10 dL g−1. Surlyn significantly improved the crystallization rate of PET. The half crystallization time (t1/2) was decreased from 2.32 min of PPET to 0.74 min of SPPET, standing for PET blended with 1.4 mass% PMDI and 1.2 mass% Surlyn. Consequently, PMDI combined with Surlyn synergistically improved the comprehensive mechanical properties of PET, especially the notched impact strength from 29.2 J m−1 of PET to 45.2 J m−1 of SPPET.

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Acknowledgements

We gratefully acknowledge the support from the projects for Academician workstation of Guangdong (2015B090904001) and Dongguan.

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Authors and Affiliations

  1. School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, People’s Republic of China

    Yiyang Liu, Alvianto Wirasaputra, Zhijie Jiang, Shumei Liu & Jianqing Zhao

  2. Silverage Engineering Plastics (Dongguan) Co., Ltd., Dongguan, 523187, People’s Republic of China

    Yi Fu

Authors
  1. Yiyang Liu
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  2. Alvianto Wirasaputra
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  3. Zhijie Jiang
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  4. Shumei Liu
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  5. Jianqing Zhao
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  6. Yi Fu
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Correspondence to Shumei Liu or Jianqing Zhao.

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Liu, Y., Wirasaputra, A., Jiang, Z. et al. Fabrication of improved overall properties of poly (ethylene terephthalate) by simultaneous chain extension and crystallization promotion. J Therm Anal Calorim 133, 1447–1454 (2018). https://doi.org/10.1007/s10973-018-7179-x

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  • DOI: https://doi.org/10.1007/s10973-018-7179-x

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