Wang Bo, Lin Fu-Hua, Li Xiang-Yang, Zhang Zhong-Wei, Xue Xiao-Rong, Liu Si-Xiao, Ji Xu-Ran, Yu Qian, Yuan Zheng-Qiu, Chen Xin-de, Luo Jun
School of Chemistry and Biological Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China.
Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China.
Polymers (Basel). 2018 Nov 18;10(11):1284. doi: 10.3390/polym10111284.
Bacterial cellulose (BC) is a new kind of cellulose with great potential in enhancing preparation of isotactic Polypropylene (iPP) composites, which have been found with excellent performance. However, the interface compatibility between BC and iPP is poor. In this study, iPP/BC composites were prepared by solution mixing. Esterification modified BC (CO) and Maleic anhydride grafted polypropylene (MAPP) added as a compatibilizer was both used to improve the interfacial compatibility of the iPP/BC composites. The rheology and isothermal crystallization behavior of the composites was tested and discussed. The result shows that the complex viscosity and storage modulus of the composite significantly increase in the rule iPP, iPP/BC2, iPP/CO2, and M-iPP/BC3, which indicates that the compatibility of the composite increases as this rule. According to the isothermal crystallization kinetics result, the crystal growth mode of iPP was not affected by the addition of BC and the interfacial compatibility. The spherulite growth rate of the iPP/BC composite increases with increasing crystallization temperature. Especially, the value decreases as the same rule with the complex viscosity and storage modulus of the composite at the same isothermal crystallization temperature. These results suggest that the interface compatibility of iPP/BC composites is greatly improved and the interface compatibility of the M-iPP/BC3 is better than the iPP/CO2.
细菌纤维素（BC）是一种新型纤维素，在增强等规聚丙烯（iPP）复合材料的制备方面具有巨大潜力，已发现该复合材料具有优异性能。然而，BC与iPP之间的界面相容性较差。在本研究中，通过溶液混合制备了iPP/BC复合材料。使用酯化改性的BC（CO）和作为增容剂添加的马来酸酐接枝聚丙烯（MAPP）来改善iPP/BC复合材料的界面相容性。对复合材料的流变学和等温结晶行为进行了测试和讨论。结果表明，在iPP、iPP/BC2、iPP/CO2和M-iPP/BC3体系中，复合材料的复数粘度和储能模量显著增加，这表明复合材料的相容性按此规律增加。根据等温结晶动力学结果，iPP的晶体生长模式不受BC添加量和界面相容性的影响。iPP/BC复合材料的球晶生长速率随结晶温度的升高而增加。特别是，在相同等温结晶温度下，该值随复合材料的复数粘度和储能模量按相同规律降低。这些结果表明，iPP/BC复合材料的界面相容性得到了极大改善，且M-iPP/BC3的界面相容性优于iPP/CO2。
