Mechanical and crystalline properties of monomer casting Nylon-6/Sio2 composites prepared via in situ polymerization
Mechanical and crystalline properties of monomer casting Nylon-6/Sio2 composites prepared via in situ polymerization
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DOI：
10.1002/pen.23449
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发表时间：
2013-09
影响因子：
3.2
通讯作者：
Sheng Xu;Xiaowen Zhao;L. Ye
中科院分区：
文献类型：
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作者：
Sheng Xu;Xiaowen Zhao;L. Ye
采用原位聚合法制备了一系列单体浇铸尼龙6/SiO2复合材料。结果表明，复合材料的拉伸强度、储能模量和缺口夏比冲击强度均有所提高，当SiO2含量为3- 5wt%时，复合材料的拉伸强度、储能模量和缺口夏比冲击强度达到最大。随着SiO2含量的增加，玻璃化转变温度（Tg）对应的α弛豫峰向高温方向移动。SiO2的添加导致熔融温度和结晶温度的增加，以及结晶度。缩短了结晶诱导时间，促进了MC尼龙-6的结晶过程，提高了晶体生长速率。自生晶化分析表明，SiO2颗粒主要通过加速晶核的生成而起到促进基体晶化的作用。加入SiO_2粒子后，MC尼龙-6的断裂面变成了具有许多屈服褶皱的长条状条纹，并伴有大量的应力发白现象，表现出明显的坚韧断裂特征。SiO2颗粒被MC尼龙6树脂包覆后，由于界面相互作用强，在应力作用下可被拔出，呈现皮芯结构。© 2012年塑料工程师协会。
A series of monomer casting (MC) nylon-6/SiO2 composites were prepared via in situ polymerization. It was found that the tensile strength, storage modulus, and notched charpy impact strength of the composites were improved and reached maximum at 3–5 wt% loading of SiO2. The α relaxation peak corresponding to the glass transition temperature (Tg) shifted to high temperature with increasing SiO2 content. Addition of SiO2 led to an increase of the melting and crystallization temperatures, and crystallinity. It also reduced the induction time of crystallization, advance the crystallization process of MC nylon-6, and improve the crystal growth rate. The self-nucleation crystallization analysis indicated that SiO2 particles played the role of facilitating the crystallization of the matrix mainly via accelerating the generation of crystal nucleus. By addition of SiO2 particles, the fracture surface of MC nylon-6 changed to distant striations with many yield folds accompanied by a large number of stress whitening, displaying much obvious character of tough fracture. SiO2 particles can be pulled-out under stress by being covered with MC nylon-6 resin due to strong interfacial interaction and presented a skin–core structure. © 2012 Society of Plastics Engineers.