表面处理对水镁石／EVA复合材料界面作用的影响  

The Effects of Coupling Agents on the Interfacial Adhesion of EVA/MH Composites

作　　者：金贤[1] 赵琦[1] 张同心[1] 包建军[1] 

机构地区：[1]高分子材料工程国家重点实验室,四川大学高分子研究所,四川成都610065

出　　处：《高分子材料科学与工程》2008年第3期82-85,89,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金重点项目(50233010)

摘　　要：选用了三种表面处理剂(硬脂酸Ste、硅烷偶联剂KH550、钛酸酯偶联剂JN114)对水镁石进行表面改性,研究了界面作用对复合材料静态力学性能、动态力学性能及粉体分散行为的影响,并对界面粘接强度进行了定量表征。结果表明,表面处理剂的加入明显改善了水镁石粉体在树脂相EVA中的分散性;硬脂酸赋予体系高的断裂伸长率,KH550赋予体系更高的拉伸强度,JN114赋予体系更好的综合性能;由DMTA的损耗因子值(tanδ)计算得出界面粘接强度相对大小依次为:KH550 modified>JN114modified>No treated>Ste modified,此结论与Tg值大小及力学测试数据完全吻合。EVA/magnesium hydroxide composties were prepared in this paper,three coupling agents,γ-aminopropyltriethoxy silane,isopropyl tri-（dioctylpyrophosphate） titanate and stearic acid were used for MH surface treatment.It is revealed by SEM that surface modification can oberviously improve the dispersion of MH in EVA resin.The mechanical properties of EVA filled with MH were investigated.Stearic acid improves elongation at break of composites,silane KH550 increases tensile strength,titanate JN114 gives better performance in both elongation and strenghth.DMTA revealls that the glass transition temperature of composites decreases in turn,KH550 modified〉JN114 modified〉No treated〉Ste modified.The interfacial bonding intensities between MH and EVA were calculated based on the dynamic loss tangent data acquried by DMTA.The results show that KH550 modification can give the best interface adhesion,the interfacail adhesion decreases in turn,KH550 modified〉JN114 modified〉No treated〉Ste modified,which is agreed with Tg and mechanical property test results.

关 键 词：水镁石 EVA 界面粘接 表面改性 动态力学热分析 

分 类 号：TB332[一般工业技术—材料科学与工程]