通过改变聚乳酸(PLA)基体中滑石粉(talc)的添加量,探索滑石粉的最佳含量。在最佳含量的基础上分别用钛酸酯、硅烷偶联剂KH550和十八胺对滑石粉进行改性,研究不同表面处理剂对滑石粉/聚乳酸复合材料性能的影响。通过力学性能、差热分析(DTA)、动态再结晶和扫描电镜(SEM)等一系列测试手段对复合材料性能进行表征分析。结果表明:滑石粉含量在1%(质量分数)时,复合材料的拉伸强度达到最大值,为62.5MPa;滑石粉经硅烷偶联剂KH550改性后,复合材料的拉伸强度可进一步提高至72.1MPa。表面处理后,滑石粉/聚乳酸复合材料的结晶速率相比较处理前进一步得到提高。
The optimum content of talc powder was obtained by adding different amounts of talc powder to polylactic acid(PLA) matrix.Talc powder was modified by titanate,silane coupling agent KH-550 and octadecylamine in order to explore the effect of different surface modifiers on talc/PLA composites.The structure was characterized by tensile strength,thermal gravimetric analysis,dynamic recrystallization and scanning electron microscopy.The results showed that the tensile strength of talc/PLA composites reached 62.5MPa when the content of talc powder was 1wt%.The tensile strength of composite can be further increased to 72.1MPa when talc powder was modified by silane coupling agent KH-550.After treated by surface treating agents,the crystallinity of composites was significantly improved.
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基金资助
国家自然科学基金(21404032);郑州市科技厅局自然科学项目(20140771);河南省高等学校青年骨干教师资助项目(2014GGJS-062);河南工业大学校基金(2014JCYJ13)
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