EVA-g-VC对PVC/LDPE共混的增容作用

Compatibilizing Effects of EVA-g-VC on PVC/LDPE Blends

本文报导了 EVA-g-VC 对 PVC/LDPE 共混物的增容作用。在 Haake 流变仪上采用预剪切机械共混法制样,通过拉力试验,光学显微镜及扫描电镜(SEM)、差热分析(DTA)等法研究表明,EVC-g-VC 对 PVC/LDPE 共混物具有较好的增容作用。EVA-g-VC 增容的 PVC/LDPE(50/50)共混物随着 EVA-g-VC 含量增加,LDPE分散相的相尺寸减小。VC 含量为56.3%的(EVA-g-VC)_H 对 PVC/LDPE 共混物强度影响比 VC 含量为26.0%的(EVA-g-VC)_L 大,对共混物的断裂伸长率影响则比(EVA-g-VC)_L 小.PVC/LDPE(50/50)共混物中加5～10份(EVA-g-VC)_H或(EVA-g-VC)_L,共混物的综合性能较好。

The compatibilizing effects of EVA-g-VC on the PVC/LDPE blends hasbeen investigated.The blends are prepared with the pershearing blending me-thod using a Haake Rheometer.Through the tests with Instron,Optical micros-cope,SEM and DTA,it is indicated that the EVA-g-VC acts as a good compa-tibilizer for the PVC/LDPE blends.The dispersing phase domain of LDPE in the PVC/LDPE(50/50)blendsdecreases with inereasing of the content of EVA-g-VC.The influence of(EVA-g-VC)_H containing 56.3% VC on the strength of PVC/LDPE blend is largerthan that Containing 26.0% VC,but influence on the breaking elongation is lessthan the lower VC-contained(EVA-g-VC)_L.The comprehensive propertiesof the PVC/LDPE(50/50)blends containing 5-10 parts of(EVA-g-VC)_H or(EVA-g-VC)_L are better.