PNBR增韧改性SMC的研究

Study on PNBR toughened SMC

以粉末丁腈橡胶（PNBR）作为低收缩添加剂改性不饱和聚酯（UP）基片状模塑料（SMC）,考察PNBR用量对改性SMC物理性能的影响。结果表明,PNBR能够显著降低改性SMC的收缩率,可将收缩率变化控制在3%-5%,同时较大幅度地提高改性SMC的抗冲击性能;PNBR的适宜用量一般为8-10份;SEM和TEM表明,PNBR与SMC基体在相界面处能够形成梯度互穿网络结构,加强了两相界面的结合。

Powdered acrylonitrile butadiene rubber（PNBR） was used as a low shrinkage additive to modify sheet moulding compounds（SMC） based on unsaturated polyester,and the effects of the addition level of PNBR on the mechanical properties of modified SMC were investigated. The results showed that PNBR could reduce the rate of shrinkage of modified SMC significantly and the shrinkage change could be controlled in the range of 3-5% ,PNBR could also improve the impact strength of SMC to a large extent;and the proper addition level of PNBR was 8- 10 phr. The analyses by SEM and TEM proved the formation of a gradient interpenetrating polymer network（IPN） in phase boundaries between PNBR and the matrix of modified SMC, which could strengthen the interfacial adhesion of the two phases.