Abstract

A multifunctional hybrid curing component (GSD) for epichlorohydrin-modified novolac resin (ENR) was synthesized via grafting poly(amidoamine) (PAMAM)-modified silica nanoparticles (SD) on graphene oxide (GO) using a ring opening reaction. SD and GSD, as two different curing components, were also used in different contents as reinforcing fillers of ENR matrix. Fourier-transform infrared spectroscopy and thermal gravimetric analysis (TGA) results proved amine-decoration of silica nanoparticles and also successful preparation of GSD. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy results were utilized to investigate structure of the SD and GSD multifunctional curing components and also the resulted composites. XRD pattern of GSD shows two peaks at 10.1 and 21.8° which belong to characteristic peaks of GO and silica nanoparticles, respectively, with weak intensities due to grafting of SD on the GO surface. Thermal investigation of the prepared composites by TGA showed that curing ENR with higher contents of GSD was resulted in higher thermal properties. The ENR composite cured with 5 wt% of GSD presented the highest char residue of 20.5% among the other hybrid composites.

摘要

通过使用开环反应在氧化石墨烯 (GO) 上接枝聚 (酰胺胺) (PAMAM) 改性二氧化硅纳米粒子 (SD)，合成了一种用于环氧氯丙烷改性酚醛清漆树脂 (ENR) 的多功能混合固化组分 (GSD)。SD和GSD作为两种不同的固化组分，也以不同的含量作为ENR基体的增强填料。傅里叶变换红外光谱和热重分析（TGA）结果证明了二氧化硅纳米粒子的胺修饰以及GSD的成功制备。X 射线衍射、扫描电子显微镜和透射电子显微镜结果用于研究 SD 和 GSD 多功能固化组分的结构以及所得复合材料。GSD 的 XRD 图案在 10.1 和 21 处显示两个峰。8°分别属于GO和二氧化硅纳米粒子的特征峰，由于在GO表面接枝SD，强度较弱。通过 TGA 对制备的复合材料的热学研究表明，用更高含量的 GSD 固化 ENR 会导致更高的热性能。在其他杂化复合材料中，用 5 wt% GSD 固化的 ENR 复合材料的焦炭残留量最高，为 20.5%。