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。
With the purpose to study the rheological behavior and interface fusion of functionalized wood powder/low density polyethylene (LDPE)thermal plastic masterbatch,benzylation poplar wood powder(Wd-Ar)was syn-thetized after alkali pretreatment with ultrasonic-assisted,then Wd-Ar/LDPE thermal plastic masterbatch were pre-pared by co-blend and extrusion method.The variations on interfacial compatibility,thermal melt flowability,ther-mal softening point,heating fusion features and changes of surface free energy of Wd-Ar/LDPE thermal plastic mas-terbatch were examined.Results show that,compared with that of untreated wood flour (Wd),SEM shows the en-hanced interface integration of plastic masterbatch and LDPE.XRD result analysis shows that crystallinity of ther-mal plastic masterbatch decreases,thermal softening point decreases,melt flow rate improves,total surface free en-ergy decreases,nonpolar component free energy increases.Wd-Ar is more effective in reducing the balance torque of LDPE combined materials,while improving melt processing performance,interface integration and mechanical prop-erties of the composites effectively.When the content of LDPE is 20wt%,the tensile strength,breaking elongation and flexural strength of Wd-Ar/LDPE composite increase by 2.55,4.55 and 2.27 times,respectively,which indi-cate that the interface bond abilities between Wd-Ar and LDPE increase.
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