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目的:研究纳米SiC无纺布对PMMA挠曲强度和杨氏弹性模量的增韧作用。方法:将已预先处理过的纳米SiC无纺布按照厚度1.0 mm、1.5 mm、2.0 mm的填入形式,合成3组SiC无纺布/PMMA复合材料,未添加的纯PMMA为对照组,进行三点弯曲实验,检测每组试件的挠曲强度和杨氏弹性模量。结果:与对照组比较,纳米SiC无纺布对PMMA的挠曲强度增强效果显著(P<0.01),当SiC无纺布填入的厚度为2.0 mm时,复合材料的挠曲强度达到最大值:(103.44±5.59)MPa,且此时复合材料的杨氏弹性模量也得到明显提高,与对照组相比差异显著(P<0.05)。结论:纳米SiC无纺布对PMMA的机械性能有增韧作用,当填入的SiC无纺布厚度为2.0 mm时,复合材料能够获得较佳的力学性能。
Objective: To study the toughening effect of nanometer SiC non-woven fabric on PMMA flexural strength and Young’s modulus. Methods: Three kinds of SiC non-woven fabric / PMMA composites were synthesized according to the thickness of 1.0 mm, 1.5 mm and 2.0 mm filled nanosized SiC non-woven fabric. Pure PMMA without adding was used as the control group Three-point bending test, test each group of specimens flexural strength and Young’s modulus. Results: Compared with the control group, the flexural strength of nano-SiC non-woven fabric reinforced PMMA significantly (P <0.01). When the thickness of SiC non-woven fabric was 2.0 mm, the flexural strength of the composites reached the maximum : (103.44 ± 5.59) MPa, and the Young’s modulus of composites also increased significantly at this time, which was significantly different from the control group (P <0.05). Conclusion: The nano-SiC non-woven fabric toughens the mechanical properties of PMMA. When the thickness of SiC non-woven fabric is 2.0 mm, the composite material can obtain better mechanical properties.