双螺杆挤出法制备碳纤维增强聚碳酸酯复合材料的研究
发布时间：2019-05-18 04:46
【摘要】： 通过利用双螺杆挤出机,采用反应挤出法将短纤维和聚碳酸酯进行复合,制备出了碳纤维分布均匀,长径比分布适中的高性能聚碳酸酯/碳纤维复合材料。 采用了气相氧化法,液相氧化法、液相氧化+硅烷偶联剂复合法等对碳纤维进行前期改性处理,利用扫描电镜观察改性后碳纤维的表面形态,分析不同方法对碳纤维表面的处理效果,不同方法处理后碳纤维表面形貌明显不同,液相氧化与气相氧化法相比,前者处理后,碳纤维表面的粗糙度明显,液相氧化后经硅烷偶联剂表面活化后表面较平整。将三种处理后的碳纤维与聚碳酸酯复合后的物理机械性能进行测试,表明液相氧化+硅烷偶联剂复合处理法制备的复合材料综合性能最佳,碳纤维含量仅为5%时,屈服强度和弹性模量与纯聚碳酸酯相比分别提高了18%和62%,确定出了碳纤维的最佳处理方法,为进一步研究奠定基础。 研究了不同的加工工艺对聚碳酸酯/碳纤维复合材料的影响,研究结果表明螺杆转速对复合材料的性能影响很小,说明提高转速改善混合效率而不影响碳纤维增强效果。研究了加工温度对复合材料性能的影响,在温度较高时,聚碳酸酯/碳纤维复合材料的力学性能略有提高。 研究了碳纤维初始长度和碳纤维的含量对复合材料的影响,结果表明：碳纤维的短切长度越长,碳纤维在复合材料中的长径比越大,复合材料的性能越好。 通过研究碳纤维含量对复合材料性能的影响,结果表明随着碳纤维含量的增加,复合材料的力学性能和热变形温度都逐渐提高；其中碳纤维含量为13%时,综合性能最佳;屈服强度从纯聚碳酸酯的58.8MPa提高到77.3MPa,提高了32%；弹性模量从1303MPa提高到2333MPa,提高了近一倍；热变形温度从110℃提高到153℃,提高了43℃。
[Abstract]:High performance polycarbonate / carbon fiber composites with uniform carbon fiber distribution and moderate aspect ratio distribution were prepared by using twin-screw extruder and reactive extrusion method to synthesize short fiber and polycarbonate. The carbon fiber was modified by gas phase oxidation and liquid phase oxidation of Silane coupling agent, and the surface morphology of the modified carbon fiber was observed by scanning electron microscope (SEM). The surface morphology of carbon fiber treated by different methods is obviously different. Compared with gas phase oxidation, the surface roughness of carbon fiber treated by liquid phase oxidation is obvious. After liquid phase oxidation, the surface of Silane coupling agent is smooth after surface activation. The physical and mechanical properties of the three kinds of treated carbon fiber and polycarbonate were tested. the results showed that the comprehensive properties of the composites prepared by liquid phase oxidative silane coupling agent composite treatment were the best, and when the carbon fiber content was only 5%, Compared with pure polycarbonate, the yield strength and elastic modulus are increased by 18% and 62%, respectively. The optimum treatment method of carbon fiber is determined, which lays a foundation for further research. The effects of different processing technologies on the properties of polycarbonate / carbon fiber composites were studied. the results show that the screw speed has little effect on the properties of the composites, which indicates that increasing the speed improves the mixing efficiency without affecting the strengthening effect of carbon fiber. The effect of processing temperature on the properties of the composites was studied. when the temperature was high, the mechanical properties of polycarbonate / carbon fiber composites were slightly improved. The effects of the initial length of carbon fiber and the content of carbon fiber on the composites were studied. the results show that the longer the short cutting length of carbon fiber is, the greater the aspect ratio of carbon fiber is in the composite, and the better the properties of the composite are. The effect of carbon fiber content on the properties of the composites was studied. the results showed that the mechanical properties and thermal deformation temperature of the composites increased gradually with the increase of carbon fiber content. When the content of carbon fiber is 13%, the comprehensive properties are the best, the yield strength is increased from 77.3 MPA to 77.3 MPA, and the elastic modulus is increased from 1303MPa to 2333 MPA, which is nearly doubled. The thermal deformation temperature increased from 110 鈩，
本文编号：2479685
[Abstract]:High performance polycarbonate / carbon fiber composites with uniform carbon fiber distribution and moderate aspect ratio distribution were prepared by using twin-screw extruder and reactive extrusion method to synthesize short fiber and polycarbonate. The carbon fiber was modified by gas phase oxidation and liquid phase oxidation of Silane coupling agent, and the surface morphology of the modified carbon fiber was observed by scanning electron microscope (SEM). The surface morphology of carbon fiber treated by different methods is obviously different. Compared with gas phase oxidation, the surface roughness of carbon fiber treated by liquid phase oxidation is obvious. After liquid phase oxidation, the surface of Silane coupling agent is smooth after surface activation. The physical and mechanical properties of the three kinds of treated carbon fiber and polycarbonate were tested. the results showed that the comprehensive properties of the composites prepared by liquid phase oxidative silane coupling agent composite treatment were the best, and when the carbon fiber content was only 5%, Compared with pure polycarbonate, the yield strength and elastic modulus are increased by 18% and 62%, respectively. The optimum treatment method of carbon fiber is determined, which lays a foundation for further research. The effects of different processing technologies on the properties of polycarbonate / carbon fiber composites were studied. the results show that the screw speed has little effect on the properties of the composites, which indicates that increasing the speed improves the mixing efficiency without affecting the strengthening effect of carbon fiber. The effect of processing temperature on the properties of the composites was studied. when the temperature was high, the mechanical properties of polycarbonate / carbon fiber composites were slightly improved. The effects of the initial length of carbon fiber and the content of carbon fiber on the composites were studied. the results show that the longer the short cutting length of carbon fiber is, the greater the aspect ratio of carbon fiber is in the composite, and the better the properties of the composite are. The effect of carbon fiber content on the properties of the composites was studied. the results showed that the mechanical properties and thermal deformation temperature of the composites increased gradually with the increase of carbon fiber content. When the content of carbon fiber is 13%, the comprehensive properties are the best, the yield strength is increased from 77.3 MPA to 77.3 MPA, and the elastic modulus is increased from 1303MPa to 2333 MPA, which is nearly doubled. The thermal deformation temperature increased from 110 鈩，
本文编号：2479685
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