摘要
采用过氧化二异丙苯(DCP)对热塑性聚氨酯弹性体(TPU)/乙烯-醋酸乙烯酯共聚物(EVM)共混物实施动态硫化后,TPU/EVM共混物的表观黏度增大,非牛顿性增强,挤出胀大比增大,挤出物表面粗糙。其中TPU/EVM=75/25时,黏度增加最大,并且随剪切速率的增加其非牛顿性由硫化前的减弱变为硫化后的增强。动态硫化后,纯TPU的表观黏度增大,说明过氧化物使其发生了一定程度的交联而又使其不失热塑性。
Blend of thermoplastic polyurethane （TPU）/ethylene-vinyl acetate copolymer （EVM） was dynamically vulcanized by dicumyl peroxide （DCP） in Haake rheometer. The apparent viscosity, nonnewtonianism and die swell ratio of various ratios of dynamical vulcanizates of TPU/EVM increased and the extrudates became rougher compared with unvulcanizated blends; The viscosity of TPU/EVM = 75/25 vulcanizate increased most and its nonnewtonianism increases as the increase of shear rate which appeared against the corresponding unvlucanizate. It is found that DCP can cure TPU in a certain degree and still keep its thermoplastic property.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2009年第9期121-124,共4页
Polymer Materials Science & Engineering
