纳米ZnO填充改性无规共聚聚丙烯的性能

Properties of Nano-ZnO Filled Polypropylene Random Copolymer

为获得抗菌性无规共聚聚丙烯(PPR)复合材料,分别采用硅烷偶联剂和钛酸酯偶联剂对纳米ZnO (Si-ZnO和Ti-ZnO)进行表面处理,并填充制备了PPR复合材料。对比研究了未处理的纳米ZnO和偶联剂表面处理的纳米ZnO填充PPR复合材料的力学性能、抗菌性能和结晶性能。结果表明:4%Si-ZnO和Ti-ZnO填充PPR的冲击强度为14. 2和13. 8 k J/m^2,而4%未改性纳米ZnO填充PPR的冲击强度仅为10. 8 k J/m^2。4%Ti-ZnO填充PPR制备的复合材料对大肠杆菌和金黄色葡萄球菌的抑菌率达到94. 2%和88%,而等含量纳米ZnO填充PPR复合材料对大肠杆菌和金黄色葡萄球菌的抑菌率仅为87%和51. 9%。改性和未改性纳米ZnO对PPR均具有异相成核作用,提高了PPR的结晶温度,但对PPR的熔融行为影响较小。

In order to obtain antimicrobial polypropylene random copolymer ( PPR ), nano-ZnO nanoparticles were treated with silane coupling agent and titanate coupling agent ( Si-ZnO and Ti-ZnO) and used to fill PPR composite. The mechanical properties, antimicrobial ability and crystallization behavior were compared among untreated and treated nano-ZnO filled PPR composite. It showed that the impact strength of PPR filled with 4% Si-ZnO and Ti-ZnO were 14. 2 and 13. 8 kJ/m^2, while it was only 10. 8 kJ/m^2 for that of unmodified nano-ZnO. The antimicrobial rates of PPR composite filled with 4 % Ti-ZnO against E. coli and S. aures were 94. 2% and 88. 0%,and only 87% and 51.9% for the same content of nano-ZnO filled PPR composite against E. coli and S. aures, respectively. The untreated nano-ZnO and treated nano-ZnO had heterogeneous nucleation toward PPR and improved the crystallization temperature of PPR, but the effect on the melting behavior the PPR was little.