【摘要】 以硅烷偶联剂(KH550)改性后的剑麻纤维素微晶(SFCM)为增强材料改性聚丙烯(PP),以聚丙烯接枝马来酸酐(PP-g-MAH)为二者的相容剂,采用熔融共混法制备PP/SFCM复合材料,研究了SFCM对PP/SFCM复合材料的力学性能、耐热性、流动性及熔融结晶行为的影响。力学性能测试表明,SFCM的加入可有效改善PP的强度和刚性,当SFCM的质量份数为9份时,复合材料的力学性能最佳,其拉伸强度和拉伸模量分别提高了15.3%和22.6%,弯曲强度和弯曲模量分别提高了24.6%和35.4%,缺口冲击强度提高了14.9%。热性能及流动性能测试表明,SFCM可提高PP/SFCM复合材料的维卡软化温度,而降低材料的熔体流动速率。DSC研究表明,SFCM可提高复合材料的熔融温度、结晶温度及结晶度。更多还原

【Abstract】 The polypropylene( PP) / sisal fiber cellulose microcrystalline( SFCM) composites were prepared through melt blending with silane coupling agent( KH550) modified SFCM as the reinforcing agent,and maleic anhydride-grafted polypropylene( PP-g-MAH) as the compatibilizer. The effects of SFCM on the mechanical properties,heat resistance,flow properties and melt and crystallization behaviors of the PP / SFCM composites were investigated. The mechanical tests results show that the addition of SFCM can effectively improve the strength and rigidity of PP. The mechanical properties of the composites are the best when the SFCM content is 9 phr with the tensile strength and elastic modulus of the composites increased by 15. 3% and22. 6%, respectively, the bending strength and bending modulus increased by 24. 6% and 35. 4%,respectively,and the notched impact strength increased by 14. 9%. The heat resistance and flow property tests results show that SFCM can increase the vicat softening temperature of the PP / SFCM composites but decrease the melt flow rate of the materials. Moreover,DSC studies show that SFCM can improve the melting and crystallization temperature and the crystallinity of the composites.更多还原