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以表面环氧化的可分散性纳米SiO_2为填料,采用阴离子原位聚合法制备了单体浇铸尼龙6(MCPA6)/纳米SiO_2复合材料。用场发射扫描电镜、红外光谱和热重分析仪对纳米SiO_2在MCPA6中的分散和界面作用进行了研究,并用差示扫描量热仪和X射线衍射仪对复合材料的结晶性能和晶体结构进行了表征。结果表明:纳米SiO_2在MCPA6中具有较好的分散性,且纳米SiO_2与MCPA6之间具有较强的界面作用;纳米SiO_2的引入促进了MCPA6的结晶,随着纳米SiO_2用量的增加,所得复合材料的结晶温度逐渐升高,其熔点要比纯MCPA6稍高,但其结晶度逐渐下降;纳米SiO_2不改变MCPA6的α晶型结构;退火处理结果表明,纳米SiO_2有利于MCPA6基体中α晶型的生成,加快γ晶向α晶转变。
Monodispersed nylon 6 (MCPA6) / nano-SiO 2 composites were prepared by anionic in situ polymerization with surface epoxidized dispersible nano-SiO 2 as filler. The field emission scanning electron microscopy, infrared spectroscopy and thermogravimetric analyzer were used to study the dispersion and interfacial interaction of nano-SiO_2 in MCPA6. The crystallization and crystal structure of the composites were characterized by differential scanning calorimeter and X-ray diffractometer Characterization. The results show that nano-SiO 2 has good dispersibility in MCPA6 and strong interfacial interaction between nano-SiO 2 and MCPA 6. The introduction of nano-SiO 2 promotes the crystallization of MCPA 6. With the increase of the amount of nano-SiO 2, , The melting point of which is slightly higher than that of pure MCPA6, but the crystallinity gradually decreases; nano-SiO 2 does not change the α-crystalline structure of MCPA6; the results of annealing show that nano-SiO 2 is favorable for α crystalline form of MCPA6 Generate, accelerate the γ crystal to α crystal transition.