超支化聚硼酸酯修饰氧化石墨烯对苯并噁嗪树脂的改性作用

Modification of graphene oxide-hyperbrancehd polyborate on benzoxazine resin

氧化石墨烯(GO)具有良好的耐热性和力学性能,可用于制备树脂基纳米复合材料,对树脂具有独特的改性效果,但分散性差却限制了GO对树脂基复合材料更好的改性效果。采用超支化聚硼酸酯(HBPB)与GO接枝得到氧化石墨烯-超支化聚硼酸酯(GO-HBPB),并将其用于双环苯并噁嗪树脂(B-BOZ)改性,不仅可解决GO分散性差的问题,还可利用GO-HBPB优异的耐热性,超支化结构,以及大量酚羟基端基对B-BOZ树脂噁嗪环的催化开环作用,使得GO-HBPB改性B-BOZ树脂(BOZ-GO-HBPB)具有比B-BOZ树脂更低的固化温度,在800℃(N2)下高达58.7%的残碳率,以及粗糙而柔韧的树脂浇注体断面形貌。

High performance benzoxazine resin was obtained by introducing hyperbranehed polyborate modified gra phene oxide （GO-HBPB） into bis-benzoxazine （B-INDZ）resin to overcome the defects such as high curing temperature, low char yield and poor toughness of B-BOZ resin. By virtue of the massive functional end groups, hyperbranched and rigid bo- romcontaining structures of CX.）-HBPB,not only the curing temperature and the exotherm of B-BOZ resin were decreased, but also the thermal resistance, especially char yield of PrBOZ resin can be greatly improved. Moreover,with the toughening effect of GO-HBPB, rougher surface and more plastic deformation were observed in the fractographes of GO-HBPB modi fled B-BOZ castings, suggesting that the impact specimens broke more yielding than neat PrBOZ resin.