This study describes the changes in some properties of two series of nylon 612/TiO2 composites by varying filler type (untreated and treated) and content (up 8.0 wt.%). The samples preparation by simultaneous anionic copolymerization-molding process ensures a good dispersion of the filler in matrix. Differential scanning calorimetry, thermogravimetrical analysis, static mechanical testing, dynamic mechanical analysis and scanning electron microscopy allowed to investigate the effects of filler loading on the mechanical, thermal and morphological characteristics of the samples and revealed the importance of filler treatment on the composites behaviour. The semicrystalline character has been proved by differential scanning calorimetry (only a single melting peak is present) and wide-angle X-ray diffraction (two reflexion plane with d-spacing of 0.4311 and 0.3817 nm appear). At the same filler content, the difference ΔHm1–ΔHc was higher for the samples with treated filler. The lower Tm,α(2) in comparison with Tm,α(1) revealed a modification of the nucleation process during crystallization. The main mass loss of the samples occurred between 277 and 550℃. The addition of the filler leads to the improvement of flexural strength and flexural modulus in comparison with neat copolymer. Incorporating 8.0 wt.% treated filler, the Tg value increases by about 11.0%, reaching 61.0℃.

中文翻译：

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通过阴离子共聚成型工艺制备尼龙 612/TiO2 复合材料：热性能和机械性能的比较评价

本研究描述了两个系列的尼龙 612/TiO2 复合材料在不同填料类型（未处理和处理）和含量（增加 8.0 wt.%）的情况下的一些性能变化。同时阴离子共聚-成型工艺制备样品，保证了填料在基体中的良好分散。差示扫描量热法、热重分析、静态力学测试、动态力学分析和扫描电子显微镜可以研究填料负载对样品的机械、热和形态特征的影响，并揭示了填料处理对复合材料行为的重要性。半结晶特性已通过差示扫描量热法（仅存在单个熔融峰）和广角 X 射线衍射（两个反射面，d 间距为 0. 4311 和 0.3817 nm 出现）。在相同的填料含量下，经过处理的填料样品的差异ΔHm1–ΔHc 更高。与 Tm,α(1) 相比，较低的 Tm,α(2) 揭示了结晶过程中成核过程的改变。样品的主要质量损失发生在277～550℃之间。与纯共聚物相比，填料的加入导致弯曲强度和弯曲模量的提高。加入8.0 wt.%处理过的填料，Tg值增加约11.0%，达到61.0℃。与纯共聚物相比，填料的加入导致弯曲强度和弯曲模量的提高。加入8.0 wt.%处理过的填料，Tg值增加约11.0%，达到61.0℃。与纯共聚物相比，填料的加入导致弯曲强度和弯曲模量的提高。加入8.0 wt.%处理过的填料，Tg值增加约11.0%，达到61.0℃。