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以研究功能化木粉/低密度聚乙烯(LDPE)热塑母料的流变及界面融合性为目的,采用超声波辅助碱预处理制备苄基化杨木粉(Wd-Ar),通过熔融共混挤出造粒制备了Wd-Ar/LDPE热塑母料。研究Wd-Ar/LDPE热塑母料界面相容性、熔体流动性、热软化点、热融合特性以及表面自由能的变化。结果表明:SEM显示,与未处理木粉(Wd)相比,塑化母料与LDPE的界面融合性增强;由XRD结果分析可知热塑母料结晶度减弱,热软化点有所降低,熔体流动速率提高,总表面自由能下降,非极性分量自由能增加;Wd-Ar可降低与LDPE混合物料的平衡扭矩,有效改善复合材料的熔体加工性能、界面融合性及力学性能。当LDPE含量为20wt%时,Wd-Ar/LDPE复合材料的拉伸强度、拉伸断裂伸长率及弯曲强度分别提高了2.55、4.55和2.27倍,表明Wd-Ar与LDPE复合材料间的界面黏结性增强。
To study the rheological and interfacial fusion of functionalized wood flour / low density polyethylene (LDPE) thermoplastic masterbatch, benzylated poplar wood flour (Wd-Ar) was prepared by ultrasonic-assisted alkaline pretreatment. Wd-Ar / LDPE thermoplastic masterbatch was prepared by extrusion granulation. The Wd-Ar / LDPE thermoplastic masterbatch interfacial compatibility, melt flow, thermal softening point, thermal fusion characteristics and surface free energy changes were studied. The results showed that SEM showed that the interfacial fusion of plasticized masterbatch and LDPE was stronger than that of untreated wood flour (Wd). The analysis of XRD results showed that the crystallinity of the thermoplastic masterbatch decreased, the softening point decreased, The bulk flow rate increases, the total surface free energy decreases, and the free energy of nonpolar components increases. The Wd-Ar can reduce the balance torque with the LDPE mixture and effectively improve the melt processability, interfacial fusion and mechanical properties of the composites. When the content of LDPE is 20wt%, the tensile strength, tensile elongation at break and flexural strength of Wd-Ar / LDPE composites increase by 2.55, 4.55 and 2.27 times, respectively, indicating that the interface between Wd-Ar and LDPE composites Cohesion increased.