writer：Xihua Cui, Jing Jin, Guiyan Zhao, Wei Jiang
keywords：聚碳酸丙烯酯, 氯化, 淀粉, 共混物, 相容性
source：期刊
specific source：Polymer Bulletin, 2020, 77(3), 1327-1342
Issue time：2020年

摘要：通过水相悬浮氯化反应对聚碳酸丙烯酯（PPC）进行氯化学改性，产物命名为氯化聚碳酸丙烯酯（CPPC）。13C NMR结果表明PPC成功氯化；GPC结果表明，由于氯化反应中PPC降解，CPPC分子量显著下降。将制备的CPPC与马来酸酐封端PPC（PPC-MA）和热塑性淀粉（TPS）熔融共混，考察CPPC对PPC-MA/TPS共混物相容性、流变和力学性能的影响。研究发现，CPPC可增强PPC-MA与TPS之间的相互作用，因此适量加入CPPC可有效提高PPC-MA/TPS共混物相容性并形成完善共连续结构。由于相容性提高，含CPPC共混物在低频呈现非末端行为，在高频呈现明显剪切变稀行为。当CPPC含量增加至5.0 wt%时，共混物拉伸强度、断裂伸长率和杨氏模量同时提高；进一步增加CPPC含量则因相容性降低和CPPC自身力学性能较差而下降。PPC-MA/TPS共混物在CPPC含量为5.0 wt%时力学性能最优，断裂伸长率、拉伸强度和杨氏模量分别可达22.4%、12.7 MPa和611.3 MPa。

Abstract：Poly(propylene carbonate) (PPC) was chemically modified by chlorine through water phase suspension chlorination reaction, and the product was named as chlorinated poly(propylene carbonate) (CPPC). 13C NMR results showed that the PPC was successfully chlorinated by this method. GPC results indicated that the molecular weight of CPPC dropped considerably owing to the degradation of PPC during chlorination reaction. The prepared CPPC was then melt-blended with maleic anhydride end-capped PPC (PPC-MA) and thermoplastic starch (TPS) to investigate the effects of CPPC on the compatibility, rheological and mechanical properties of PPC-MA/TPS blends. It was found that CPPC could enhance the interaction between PPC-MA and TPS. Therefore, moderate addition of CPPC could efficiently improve the compatibility of PPC-MA/TPS blends and a perfect co-continuous structure was formed. Due to the improved compatibility, rheological investigation revealed that the blends with CPPC exhibited a non-terminal behavior at low frequencies and a pronounced shear thinning behavior at high frequencies. Moreover, tensile strength, elongation at break and Young's modulus of the blends simultaneously increased with increasing the CPPC content up to 5.0 wt%, which is also ascribed to the improved compatibility. Thereafter, they decreased with further increasing the CPPC content because of the reduced compatibility and poor mechanical properties of CPPC. The optimal mechanical properties of PPC-MA/TPS blends could be obtained when the content of CPPC was 5.0 wt%, at which elongation at break, tensile strength and Young's modulus could reach 22.4%, 12.7 MPa and 611.3 MPa, separately.

论文链接：https://doi.org/10.1007/s00289-019-02762-7