摘要
设计了一种新的梯度组分分布数学模型,采用梯度因子和梯度层数控制梯度组分的分布,并采用逐层浇铸的方法制备了聚氨酯(PU)/环氧(EP)梯度互穿网络聚合物(IPNs)材料,研究了其微观形貌和力学性能。研究结果表明,随着梯度组分含量沿梯度方向的变化,不同梯度单层的相结构和断裂特性也呈现相应的变化,逐渐由分散相向连续相转变。从中心层到表面层,梯度单层的弯曲模量逐层降低,挠度逐层增大,梯度IPNs的弯曲强度和模量低于普通IPNs,抗冲击性能高于普通IPNs。
A new mathematic model was adopted to design the distribution of graded component in graded IPNs, both graded layers number and graded factor were used to control the distribution of graded component . PU/EP graded IPNs were prepared by means of casting layer by layer, both microscopical configuration and mechanical properties were studied. The results indicated that microscopical configuration of graded layer changes from disperse configuration to con- tinous configuration with variation of content of graded component. Fracture charateristic changes from brittleness to toughness. Flexural elastic modulus of gaded layer decreased gradually from central layer to surface layer. And flexibility of gaded layer increased gradually. Flexural stength of graded IPNs was lower than that of IPNs. Its impact stength was higher than that of IPNs.
出处
《化工新型材料》
CAS
CSCD
北大核心
2008年第2期58-60,共3页
New Chemical Materials
关键词
聚氨酯
环氧
互穿聚合物网络(IPNs)
梯度IPNs
微观形貌
力学性能
polyurethane,epoxy resin,interpenetrating polymer networks（IPNs）,graded IPNs,mecharlical property,microscopical configuration
