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Enhanced crystallization behaviour and impact toughness of poly(ethylene terephthalate) with a phenyl phosphonic acid salts compound

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Abstract

Low crystallization rate and inherent brittleness characteristics limit the wide application of PET. In this paper, it was found that a low molecular weight Phenyl phosphonic acid salts compound (TMC-210) is a very effective nucleator and can enhance the impact strength very much. So, the effect of TMC-210 on the crystallization behaviour and mechanical properties of poly(ethylene terephthalate) were systematically evaluated by differential scanning calorimetry (DSC), polarized optical microscopy (POM), wide angle X-ray diffraction (WAXD), scanning electron microscope (SEM) and mechanical properties test. The results show that TMC-210 obviously improves the crystallization temperature and accelerates the crystallization rate of PET and reflects a significant heterogeneous nucleating effect with a nucleation efficiency of 99.8 % when introducing a low content of 0.6 wt% TMC-210. The spherulites size and number of blended PET are greater than pure PET. The crystal structure of PET does not change but the blends with high TMC-210 content appears new diffraction peaks in x-ray diffraction spectrogram and it may attribute to the agglomeration of TMC-210 particles, which is verified by SEM observation. The impact fracture surface of PET develops a brittle ductile transition and thus the impact strength of PET improves significantly. Additionally, Lauritzen–Hoffman equation was used to discuss the effect of TMC-210 on the fold surface free energy (σ e) of PET in the crystallization process and found that the σ e values of PET/TMC-210 blends is smaller than that of pure PET.

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Acknowledgments

We gratefully acknowledge financial support from National Natural Science Foundation of China (Nos. 21264012).

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Authors and Affiliations

  1. Ministry-Province Co-cultivated Key Laboratory Base of Natural Gas Conversion, Ningxia University, 539 Helanshan West Road, Yinchuan, 750021, China

    Zhiyuan Shen, Faliang Luo & Xiaomei Lei

  2. School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, 750021, China

    Zhiyuan Shen, Faliang Luo, Xiaomei Lei & Lijie Ji

  3. Shanxi Provincial Institute of Chemical Industry, Taiyuan, 030021, China

    Kezhi Wang

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  1. Zhiyuan Shen
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  2. Faliang Luo
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  3. Xiaomei Lei
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Correspondence to Faliang Luo.

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We are sure that this work is original research and is not submitted to any other journal and there is no conflict of interest both for financial support or relationships.

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This work is financially supported by the National Natural Science Foundation of China (No. 21264012).

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Shen, Z., Luo, F., Lei, X. et al. Enhanced crystallization behaviour and impact toughness of poly(ethylene terephthalate) with a phenyl phosphonic acid salts compound. J Polym Res 23, 212 (2016). https://doi.org/10.1007/s10965-016-1108-0

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  • DOI: https://doi.org/10.1007/s10965-016-1108-0

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