MAPP/EAA处理对聚丙烯/小麦秸秆粉复合材料性能的影响

研究了马来酸酐接枝聚丙烯（MAPP）、乙烯丙烯酸共聚物（EAA）处理对聚丙烯（PP） /小麦秸秆粉（WSP）复合材料性能的影响。结果表明，随着体系中MAPP质量份数的增加，PP/WSP的拉伸强度和弯曲强度均逐渐增大，但冲击强度却先增加后减小，复合材料达到塑化峰的时间逐渐延长；使用EAA后，无论体系中是否已经使用了MAPP，PP/WSP的拉伸、弯曲和冲击强度均可得以提高，特别对于未使用MAPP的体系，效果更加明显，可分别提高65.04 %、45.42 %和6.75 %，储能模量增加，表面疏水性增强，平衡扭矩从13.9 N·m降至11.8 N·m，吸水尺寸变化率及吸水率下降，吸水平衡时间缩短；使用EAA可改善PP/WSP中WSP与PP间的界面结合，改善PP/WSP力学性能、热稳定性能、表面疏水性能、尺寸稳定性能和加工性能，降低其吸水率。

Effects of MAPP and/or Ethylene Acrylic Acid Copolymer on Properties of Polypropylene/Wheat Straw Powder Composites

The effects of maleic anhydride-grafted polypropylene（MAPP） and ethylene acrylic acid copolymer（EAA） on the properties of polypropylene（PP） /wheat straw powder（WSP） composites （PP/WSP） were investigated. The results indicated that the tensile and flexural strengths of PP/WSP increased with an increase of MAPP content. However， their impact strength increased at first and then tended to decrease. Moreover， the time for PP/WSP to reach the melting peak was prolonged. When EAA is used for the composites， the tensile， flexural and impact strengths were all found to increase no matter whether MAPP was used or not， especially for the composites without MAPP. The tensile， flexural and impact strengths of PP/WSP increased by 65.04 %， 45.42 % and 6.75 %， respectively. Moreover， their storage moduli were enhanced， and their surface hydrophobocity was strengthened. The balance torque of the composites also decreased from 13.9 N·m to 11.8 N·m， and their dimension change rate and water uptake rate after immersion in water decreased. The time to reach water absorption equilibrium was shortened. The addition of EAA could improve the interfacial bonding between WSP and PP. As a result， the mechanical properties， thermal stability， surface hydrophobicity， dimensional stability and processing convenience of the composites were all modified. In addition， their water uptake was reduced.