钛酸钾晶须的添加量对晶须增强PMMA挠曲强度影响

目的：研究钛酸钾晶须的添加量对晶须增强PMMA挠曲强度的影响并探讨其影响机理。方法：将3．0％的硅烷偶联剂处理的钛酸钾晶须，按照5％、10％、15％、20％的添加量，合成4组晶须／PMMA复合材料，未添加晶须的纯PMMA为对照组，进行三点弯曲测试。每组随机选出一个试件进行断面扫描电镜观察。结果：钛酸钾晶须添加量为15％时，晶须／PMMA复合材料的挠曲强度最高，达到（72，87±6．13）MPa。扫描电镜显示此添加量时晶须在树脂基中的分散比较均匀。钛酸钾晶须组的挠曲强度与对照组相比提高了14％。结论：钛酸钾晶须的含量对晶须／PMMA复合材料的挠曲强度有影响，钛酸钾晶须的添加量为15％时，晶须／PMMA复合材料的挠曲强度最高。

The effect of whisker fraction on flexural strength of whisker-PMMA composite reinforced with potassium ti-tanate whiskers

Objective： To evaluate the effect of whisker fraction on flexural strength of whisker-PMMA composite reinforced with potassium titanate whiskers and investigate the relative mechanism. Method：Potassium titanate whiskers treated with 3.0% silane coupling agent were added into resin matrix to＇ synthesize four group composite according to the following mass fraction： 5%. 10%, 15%.20%. Control groups without any whiskers were prepared. All groups were tested for flexural strength with three-point bending test. A specimen from each group was randomly chosen to examine with SEM. Result： The flexural strength of composite is highest when potassium titanate whiskers are concentrated with 15%.The value is （72.87±6.13） MPa. SEM examination revealed that the whiskers were well-dispersed in resin matrix with the concentra- tion. Potassium titanate whiskers improved the flexural strength of the control group over 14%. Conclusion： Potassium ti- tanate whisker fraction has effect on the flexural strength of PMMA reinforced with whiskers. The flexural strength of composite is highest when potassium titanate whiskers is concentrated with 15%.