国内精品国产三级国产在线专_欧美日韩在线播放一区二区_成人xxxx视频_欧美激情视频一区_色女人综合av_久久久亚洲影院_久久久久久九九_成人免费网站在线_日韩美女毛茸茸_狠狠干一区二区

Thermoset resins have wide applications in coatings, adhesives, and structural components, but often their usage is often limited by their intrinsic brittleness. Here, we report that a thiourea based polymer blending with a kind of thermoset resin (benzoxazine) yields materials improve toughness without deteriorating other properties. Synchronous enhancement in the toughness properties, flexural properties and thermal properties (T_g) is showed in blends containing 5 wt% thiourea based polymer. Notably, there is more than 156%, 35% and 14 °C improvements in the above properties respectively compared with those of polybenzoxazine. A curing mechanism, chemical structure, phase morphology and processing properties of blends are discussed. The results illustrate the modified and newly introduced hydrogen-bonded pairs in the system are the main reason for simultaneously enhancing the properties of cured products. The method by modifying the hydrogen bonds type and amount of thermoset resin is facile to get enhanced comprehensive properties and have a profound meaning for fiber-reinforced composite.