A new strategy for the synthesis of modified novolac resin and its polymer/clay nanocomposite

[摘要] A novel epoxy nanocomposite composed of epoxidized novolac (ENR), epoxidized polystyrene (EPSt), and nanoclaywas fabricated and characterized successfully. For this purpose, the novolac was epoxylated using a substitution nucleophilicreaction between hydroxyl group of novolac and chlorine group of epichlorohydrin. The EPSt was synthesizedthrough the oxidizing of an allylated PSt (All-PSt). A mixture of ENR (70 wt%), EPSt (20 wt%) and Cloisite® 20A (5 wt%)was cured using ethylenediamine (EDA; 5 wt%) to afford a C-ENR-EPSt/clay nanocomposite. The transition electron microscopy(TEM) as well as powder X-ray diffraction (XRD) analysis revealed that the fabricated nanocomposite has an exfoliatedstructure. As the thermal property studies results, the addition of EPSt as well as Cloisite® 20A has synergistic effecton the thermal stability of the ENR resin.

[学科分类] 生物科学（综合）

[关键词] nanocomposites;epoxidized novolac;epoxidized polystyrene;clay;thermal stability