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采用熔融共混法制备低密度聚乙烯(LDPE)/剑麻纤维素微晶(SFCM)复合材料,研究了SFCM的用量对LDPE/SFCM复合材料的力学性能、维卡软化点、熔体流动速率及熔融结晶行为的影响。力学性能测试表明:SFCM的加入可明显提高基体LDPE的拉伸弹性模量、弯曲强度及模量,但降低了体系的拉伸强度。当加入3份的SFCM时,LDPE/SFCM复合材料的缺口冲击强度最大,为46.9 k J/m~2,比纯LDPE提高了33.2%。热性能、流动性能及DSC研究表明:SFCM的加入对LDPE/SFCM复合材料的维卡软化点、熔融温度及结晶温度影响不明显,但降低了复合材料的熔体流动速率,同时LDPE的结晶度明显提高。
The low density polyethylene (LDPE) / sisal cellulose microcrystal (SFCM) composites were prepared by melt blending method. The effects of the amount of SFCM on the mechanical properties, Vicat softening point, melt flow rate And the effect of melt crystallization behavior. Mechanical tests show that the addition of SFCM can significantly improve the tensile modulus, flexural strength and modulus of LDPE, but decrease the tensile strength of the system. When adding 3 parts of SFCM, the notched impact strength of LDPE / SFCM composites is the highest, which is 46.9 kJ / m ~ 2, which is 33.2% higher than pure LDPE. The results of thermal properties, flowability and DSC show that the addition of SFCM has no obvious effect on the Vicat softening point, melting temperature and crystallization temperature of LDPE / SFCM composites, but decreases the melt flow rate of LDPE / SFCM composites. Meanwhile, the crystallinity Significantly improved.