热塑性复合材料的基体改性及纤维床层结构研究

发布时间：2019-02-17 09:10

【摘要】：目前国内热塑性复合材料的应用处于快速发展阶段,进行有效的基体改性并选择合理的纤维床层结构以提高其力学性能具有重要意义。采用熔融浸渍法制备了玻纤毡增强热塑性复合材料,从相容剂种类及组合、热塑性复合材料的增强增韧、改性基体分布设计及纤维床层结构方面进行了热塑性复合材料的基体改性及纤维床层结构研究。结果表明:相容剂PP-g-MA可以诱导形成界面横晶并调节基体微结构,获得适宜的界面结合,提高强度的同时又能获得较高的韧性;与不含相容剂的GMT相比,相容剂PP-g-AA使GMT的冲击强度提高8%;PP-g-MA与PP-g-AA组合改性对热塑性复合材料刚性与韧性的平衡效果不明显;与相容剂组合改性相比,改性基体分布设计使GMT力学性能有较大改善,其中表层为相容剂PP-g-MA改性刚性层的GMT其拉伸强度提高了 17%,弯曲强度与模量提高了 29%和27%,冲击强度提高了 48%,表层为相容剂PP-g-AA改性韧性层的GMT其拉伸与弯曲性能变化不大,但冲击强度提高了 88%;与短切玻纤毡相比,连续玻纤毡增强GMT具有较高的力学性能,冲击强度提高了 91%;纤维床层分布对力学性能的影响与相容剂含量有关,PP-g-MA含量低于5%时,增强体外移能显著提高GMT的拉伸和弯曲性能,但对韧性影响不明显,而PP-g-MA含量在5%～7%之间时,增强体靠近芯层的GMT其拉伸和弯曲性能上升幅度较大,同时两种分布的影响差异缩小。
[Abstract]:At present, the application of thermoplastic composites in China is in the stage of rapid development. It is of great significance to modify the matrix effectively and select reasonable fiber bed structure to improve its mechanical properties. Glass fiber felt reinforced thermoplastic composites were prepared by melt impregnation. The matrix modification and fiber bed structure of thermoplastic composites were studied in the aspect of matrix distribution design and fiber bed structure. The results show that the compatibilizer PP-g-MA can induce the formation of interfacial transverse crystals and adjust the microstructure of the matrix to obtain suitable interfacial bonding. Compared with GMT without compatibilizer, the impact strength of GMT increased by 8% by the compatibilizer PP-g-AA. The equilibrium effect of PP-g-MA and PP-g-AA on rigidity and toughness of thermoplastic composites was not obvious. Compared with the composite modification of compatibilizer, the modified matrix distribution design improved the mechanical properties of GMT greatly, and the tensile strength of GMT, whose surface layer was modified by compatibilizer PP-g-MA, was increased by 17%. The flexural strength and modulus increased by 29% and 27%, and the impact strength increased by 48%. The tensile and flexural properties of GMT, which was modified by compatibilizer PP-g-AA, did not change much, but the impact strength increased 88%. Compared with short-cut glass fiber felt, continuous glass fiber felt reinforced GMT has higher mechanical properties and higher impact strength. The effect of fiber bed distribution on mechanical properties is related to the content of compatibilizer. When the content of PP-g-MA is lower than 5, the tensile and flexural properties of GMT can be significantly improved by the enhancement in vitro, but the effect on toughness is not obvious. When the PP-g-MA content is between 5% and 7%, the tensile and flexural properties of GMT near the core layer increase greatly, and the difference between the two distributions is reduced.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB33

【参考文献】