【摘要】：目前國(guó)內(nèi)熱塑性復(fù)合材料的應(yīng)用處于快速發(fā)展階段,進(jìn)行有效的基體改性并選擇合理的纖維床層結(jié)構(gòu)以提高其力學(xué)性能具有重要意義。采用熔融浸漬法制備了玻纖氈增強(qiáng)熱塑性復(fù)合材料,從相容劑種類及組合、熱塑性復(fù)合材料的增強(qiáng)增韌、改性基體分布設(shè)計(jì)及纖維床層結(jié)構(gòu)方面進(jìn)行了熱塑性復(fù)合材料的基體改性及纖維床層結(jié)構(gòu)研究。結(jié)果表明:相容劑PP-g-MA可以誘導(dǎo)形成界面橫晶并調(diào)節(jié)基體微結(jié)構(gòu),獲得適宜的界面結(jié)合,提高強(qiáng)度的同時(shí)又能獲得較高的韌性;與不含相容劑的GMT相比,相容劑PP-g-AA使GMT的沖擊強(qiáng)度提高8%;PP-g-MA與PP-g-AA組合改性對(duì)熱塑性復(fù)合材料剛性與韌性的平衡效果不明顯;與相容劑組合改性相比,改性基體分布設(shè)計(jì)使GMT力學(xué)性能有較大改善,其中表層為相容劑PP-g-MA改性剛性層的GMT其拉伸強(qiáng)度提高了 17%,彎曲強(qiáng)度與模量提高了 29%和27%,沖擊強(qiáng)度提高了 48%,表層為相容劑PP-g-AA改性韌性層的GMT其拉伸與彎曲性能變化不大,但沖擊強(qiáng)度提高了 88%;與短切玻纖氈相比,連續(xù)玻纖氈增強(qiáng)GMT具有較高的力學(xué)性能,沖擊強(qiáng)度提高了 91%;纖維床層分布對(duì)力學(xué)性能的影響與相容劑含量有關(guān),PP-g-MA含量低于5%時(shí),增強(qiáng)體外移能顯著提高GMT的拉伸和彎曲性能,但對(duì)韌性影響不明顯,而PP-g-MA含量在5%～7%之間時(shí),增強(qiáng)體靠近芯層的GMT其拉伸和彎曲性能上升幅度較大,同時(shí)兩種分布的影響差異縮小。
[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.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB33

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