Preparation of chlorinated poly(propylene carbonate) and its effects on the mechanical properties of poly(propylene carbonate)/starch blends as a compatibilizer
Preparation of chlorinated poly(propylene carbonate) and its effects on the mechanical properties of poly(propylene carbonate)/starch blends as a compatibilizer
复制标题
氯化聚碳酸丙二酯的制备及其增容剂对聚碳酸丙二酯/淀粉共混物力学性能的影响
DOI：
10.1007/s00289-019-02762-7
复制
发表时间：
2020
期刊：
影响因子：
3.2
通讯作者：
Jiang Wei
中科院分区：
文献类型：
--
作者：
Cui Xihua;Jin Jing;Zhao Guiyan;Jiang Wei
采用水相悬浮氯化法对聚碳酸亚丙酯（PPC）进行氯改性，产物命名为氯化聚碳酸亚丙酯（CPPC）。GPC结果表明，氯化反应过程中PPC的降解使产物的分子量明显下降。将制备的CPPC与马来酸酐封端的PPC（PPC-MA）和热塑性淀粉（TPS）熔融共混，研究了CPPC对PPC-MA/TPS共混物相容性、流变性能和力学性能的影响。结果表明，CPPC能增强PPC-MA与TPS的相互作用。因此，适量CPPC的加入可以有效地改善PPC-MA/TPS共混体系的相容性，形成较好的共连续结构。由于相容性的改善，流变学研究表明，与CPPC的共混物表现出非终端行为在低频和显着的剪切变稀行为在高频。此外，拉伸强度，断裂伸长率和杨氏模量的共混物的同时增加，增加CPPC的含量高达5.0重量%，这也归因于改善的相容性。此后，由于CPPC的相容性降低和力学性能差，它们随着CPPC含量的进一步增加而降低。当CPPC含量为5.0wt%时，共混物的力学性能最佳，断裂伸长率、拉伸强度和杨氏模量分别达到22.4%、12.7MPa和611.3MPa。
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.