氧化石墨烯/多面体低聚倍半硅氧烷增强双马树脂合成及其性能表征

Preparation and Charaterization of Graphene Oxide/Polyhdral Oligosilsesquioxanes Modified Bismaleimide Res

在酸掺杂条件下,原位合成了多面体低聚倍半硅氧烷(POSS)插层氧化石墨烯(GO)的GO/POSS_(C-I)复合材料。通过SEM、XRD、IR等手段对合成材料进行表。征结果表明,大量具有核-壳结构的无机-有机杂化POSS纳米粒子插层至片层结构GO表面。在增强双马树脂固化过程中,GO/POSS_(C-I)良好分散于双马树脂基体中形成黑色均匀固化物。DMA试验结果表明,GO/POSS_(C-I)增强粒子对基体中有机碳链运动形成了显著的限制作用,提升材料热稳定性能,最佳玻璃化转变温度相比未增强双马树脂提升约127℃;同时,GO/POSS_(C-I)能够通过裂纹钝化或拨出效应,增强材料力学性能,弯曲强度和弯曲模量相比未增强双马树脂分别提升16.5%和3.4%。

The prepare graphene oxide/polyhdral oligosilsesquioxanes(GO/POSS_(C-I))composite was prepared by the in-situ method under acid and miscellaneous conditions.SEM,XRD and IR were performed to characterize morphologies and crystallizations of as-prepared material.The results show that considerable inorganic-organic hybrid POSS nano-material with shell-core structure is inserted into the surfaces of well dispersed lamllar GO.In the curing process of modified bismaleimide(BMI)resin,GO/POSS_(C-I) composite material is well dispersed in the matrix of resin to form homogeneous black cured compound resin.Results of DMA tests show that GO/POSS_(C-I) composite material has obvious restriction effect on the movement of organic carbon chains and improve the thermal stability of material.The optimum glass transition temperature is 27℃higher than that of unmodified bismaleimide resin.Furthermore,the mechincal properties of composite are improved because of the crack passivation or pull-out effect of GO/POSS_(C-I) composite.The bending strength and modulus of modified BMI resin are incresed by 16.5%and 3.4%,respectively.