Microcapsules with dicyclopentadiene(DCPD) as core material and urea formaldehyde resin as wall material used for making self-healing polymer material were prepared with the in-situ polymerization method.The effect of...Microcapsules with dicyclopentadiene(DCPD) as core material and urea formaldehyde resin as wall material used for making self-healing polymer material were prepared with the in-situ polymerization method.The effect of microcapsules on the fracture toughness of epoxy resin was studied.The addition of microcapsules into epoxy resin results in the decrease of fracture toughness.When microcapsule content was kept constant,as the microcapsule size increased the fracture toughness of the epoxy resin decreased linearly and the percentage of decrease compared to the neat epoxy without microcapsules increased linearly.Moreover, the fracture toughness of the material decreases linearly with the increase of microcapsule content.展开更多
文摘Microcapsules with dicyclopentadiene(DCPD) as core material and urea formaldehyde resin as wall material used for making self-healing polymer material were prepared with the in-situ polymerization method.The effect of microcapsules on the fracture toughness of epoxy resin was studied.The addition of microcapsules into epoxy resin results in the decrease of fracture toughness.When microcapsule content was kept constant,as the microcapsule size increased the fracture toughness of the epoxy resin decreased linearly and the percentage of decrease compared to the neat epoxy without microcapsules increased linearly.Moreover, the fracture toughness of the material decreases linearly with the increase of microcapsule content.
文摘以尿素、三聚氰胺和甲醛为壁材,E-51环氧树脂为囊芯制备了环氧树脂微胶囊.用TEM、SEM和Zeta激光粒度测定仪观察分析微胶囊的粒径分布,讨论了反应条件对微胶囊粒径分布的影响.通过实验,提出制备该环氧树脂微胶囊的最佳反应条件为:尿素、三聚氰胺和甲醛的物质的量之比n(尿素)∶n(三聚氰胺)∶n(甲醛)=2∶1∶4,NH4C l为酸性催化剂,在pH=2.5,65℃和搅拌速率为600 r/m in的体系中反应4 h.
