Zhang Qing, Gao Yongguang, Liu Huiyuan, Shu Shili, Chen Wei
College of Chemistry, Tangshan Normal University, Tangshan 063000, China.
Materials (Basel). 2022 Sep 5;15(17):6179. doi: 10.3390/ma15176179.
Poly(β-hydroxybutyrate--β-hydroxyvalerate) (PHBV) was modified with endic anhydride grafted poly(propylene carbonate) (EA-PPC), and then PHBV/EA-PPC composite polymers were prepared by melt blending under the catalysis of stannous octoate (Sn(Oct)). The blends were characterized by an electronic universal testing machine, cantilever impact testing machine, and differential scanning calorimeter (DSC), as well as dynamic mechanical analysis (DMA) and field emission scanning electron microscopy (FESEM). Effects of the amount of Sn(Oct) on the mechanical properties, thermal properties, and morphology of the blends were discussed. The results showed that the addition of Sn(Oct) promoted the transesterification reaction between PHBV and EA-PPC, and the compatibility between PHBV and PPC was greatly improved. When the amount of Sn(Oct) was 3 wt%, the impact strength and elongation at break of the PHBV/EA-PPC blend increased from 3.7 kJ/m and 4.1% to 5.9 kJ/m and 387.5%, respectively, and there was no significant decrease in tensile strength. Additionally, four esterification reaction mechanisms for PHBV/EA-PPC blends were proposed.
用马来酸酐接枝聚碳酸亚丙酯（EA-PPC）对聚（β-羟基丁酸酯- -β-羟基戊酸酯）（PHBV）进行改性，然后在辛酸亚锡（Sn(Oct)）催化下通过熔融共混制备PHBV/EA-PPC复合聚合物。通过电子万能试验机、悬臂梁冲击试验机、差示扫描量热仪（DSC）以及动态力学分析（DMA）和场发射扫描电子显微镜（FESEM）对共混物进行表征。讨论了Sn(Oct)用量对共混物力学性能、热性能和形态的影响。结果表明，Sn(Oct)的加入促进了PHBV与EA-PPC之间的酯交换反应，大大提高了PHBV与PPC之间的相容性。当Sn(Oct)用量为3 wt%时，PHBV/EA-PPC共混物的冲击强度和断裂伸长率分别从3.7 kJ/m和4.1%提高到5.9 kJ/m和387.5%，拉伸强度没有显著下降。此外，还提出了PHBV/EA-PPC共混物的四种酯化反应机理。
