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当前位置: 首页 > 文章 > EPDM_MA对木粉/聚丙烯复合材料性能的影响 林业科学 2005,41 (6)
Position: Home > Articles > Effects of EPDM-MA on the Properties of Wood Flour/Polypropylene Composites Scientia Silvae Sinicae 2005,41 (6)

EPDM_MA对木粉/聚丙烯复合材料性能的影响

作  者：
宋永明;王清文;郭垂根;沈长生
单  位：
东北林业大学生物质材料科学与技术教育部重点实验室;中国木材节约发展中心
关键词：
木粉;聚丙烯;复合材料;三元乙丙橡胶(EPDM_MA);动态力学性能
摘  要：
采用特定设计的双螺杆和单螺杆串联挤出机组,以挤出的方式制备木粉/聚丙烯复合材料。主要采用静态力学试验、动态力学热分析(DMTA)和扫描电子显微镜(SEM)观察等方法,研究了马来酸酐改性的三元乙丙橡胶(EPDM_MA)对木粉/聚丙烯复合材料的静态力学性能、动态力学性能和吸水性能的影响。静态力学性能试验结果表明:添加适量的EPDM_MA有利于提高木粉/聚丙烯复合材料的拉伸和弯曲强度,冲击强度的提高最为显著,但EPDM_MA的添加对复合材料的模量有不利影响。动态力学性能分析结果表明:复合材料的储能模量(E′)和损耗因子(tanδ)的峰值均随EPDM_MA加入量的增加而降低,后者说明EPDM_MA改善了木粉与聚丙烯的界面结合;EPDM_MA的加入,使得复合材料的主转变温度略向高温方向移动,并且在-50℃左右的低温区出现了次级转变峰,表明EPDM_MA对复合材料的热性能产生影响,尤其有利于改善其耐低温冲击性能。SEM研究结果表明:EPDM_MA的添加不仅提高了木粉和聚丙烯的界面结合,并且以直径约为0·1~1μm的球状粒子形态分散于聚丙烯中,能够通过自身的塑性变形而提高复合材料的抗冲击性能。EPDM_MA的添加,有效降低了复合材料的吸水性。
译  名：
Effects of EPDM-MA on the Properties of Wood Flour/Polypropylene Composites
作  者：
Song Yongming~(1) Wang Qingwen~(1) Guo Chuigen~(1) Shen Changsheng~(2)(1.Key Laboratory of Bio_Based Material Science and Technology of Ministry of Education, Northeast Forestry University Harbin 150040; 2.Timber Value Promotion and Substitution Administration Center P.R.C. Beijing 100834)
关键词：
wood flour; polypropylene; composites; maleic anhydride modified ethylene propylene diene rubber(EPDM_MA); dynamic mechanical properties
摘  要：
Wood flour/polypropylene composites were prepared by the special designed twin screw/single screw extruder system. The effect of EPDM_MA on water absorption, static and dynamic mechanical properties of wood flour (WF)/polypropylene (PP) composites were studied by static test, dynamic mechanical thermal analysis and scan electron microscope. The static mechanical properties of polypropylene/wood flour composites showed that the tensile strength and flexural strength were improved with the maleic anhydride modified ethylene propylene diene rubber (EPDM_MA), especially the impact strength of the composites was improved remarkably but decreased the composites' stiffness. The dynamic mechanical spectra of the composites showed that the storage modulus and tanδ peak values were decreased with increasing EPDM_MA loading. The reduction of the tanδ peak values revealed an improved interfacial adhesion between wood flour and polypropylene matrix. An increase in the main transition temperature implied the effect of EPDM_MA on thermal properties of composites. The second transition peak was also found from the spectra of DMTA about -50℃, which was especially in favor of improving impact properties. The scanning electron microscope study verifies an improved interfacial adhesion between wood flour and polypropylene matrix with EPDM_MA. EPDM_MA rubber domains were dispersed in the PP matrix, and the diameter of domains is between 0.1～1 μm. The water absorption of the composites was also decreased by EPDM_MA. EPDM_MA played a dual role, not only as a toughening agent but also as compatibilizer between wood and the polypropylene matrix.

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