Nanostructures and Thermomechanical Properties of Epoxy Thermosets Containing Reactive Diblock Copolymer

摘要

Polystyrene-block-poly(glycidyl methacrylate) reactive diblock copolymer (PS-b-PGMA) was synthesized via atom transfer radical polymerization (ATRP). The diblock copolymer was characterized using nuclear magnetic resonance (NMR) spectroscopy and gel permeation chromatography (GPC). The cured epoxy thermosets with 10–20 nm PS particles were prepared by blending the diblock copolymer with epoxy resin. The nanostructures were examined by means of transmission electronic microscopy (TEM) and small angle X-ray scattering (SAXS). The formation of the nanostructures was caused by the reaction-induced microphase separation mechanism. It is significant that the glass transition temperatures (Tgs) of these epoxy thermosets were increased by the addition of PS-b-PGMA reactive block copolymer as revealed by both differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA).