芦苇的均相酯化改性及其在PE中的应用

Homogeneous esterification modification of reed fiber and its application in the polyethylene composites

以乙酰氯为酯化剂,在自制的离子液体1-乙烯基-3-羟乙基咪唑氯盐中对芦苇纤维进行均相酯化改性;制备了聚乙烯/芦苇纤维(P/R)和聚乙烯/酯化芦苇纤维(P/ER)两种复合材料;考察了芦苇纤维用量及酯化改性对复合材料力学性能、加工性能及微观形貌的影响。结果表明,芦苇纤维和均相酯化芦苇纤维质量分数均为30%时,两种复合材料的综合性能较优。其中,添加均相酯化改性芦苇纤维的P/ER复合材料不仅较P/R复合材料的冲击强度提高了61.0%,而且均相酯化改性芦苇纤维对PE的抗拉强度、弯曲强度和弹性模量无不良影响。均相酯化改性芦苇纤维能够改善P/ER复合材料的加工流动性能,使其熔体流动速率提高了31.4%。均相酯化改性能够促进芦苇纤维在聚乙烯中的分散,提高其与聚乙烯基体树脂的界面相容性。

The homogeneous esterification modification of reed fiber was carried out in an ionic liquid1-ethenyl-3-hydroxyethyl imidazolium chloride using the acetyl chloride as the esterifying agent.PE/reed fiber（P/R）and PE/esterified reed fiber（P/ER）composites were prepared.The effects of reed fiber dosage and homogeneous esterification modification on the mechanical properties,the processing performance and microstructure of composites were studied.The results showed that when the dosage of reed fiber and homogeneous esterified reed fiber both were 30%,the comprehensive performance of two kinds of composites were better.Compared to P/R,the impact strength of the composites added esterified reed fiber increased by 61.0%.There was no bad effect on tensile strength,bending strength and elasticity modulus.The melt flowing rate of the composites contained homogeneous esterified reed fiber raised by 31.4%,which produced positive effects on the processing flow performance.Homogeneous esterification modification could promote the reed fiber to disperse in PE matrix,which was beneficial to improve the interfacial bonding between the reed fiber and matrix.