紫外光氧化交联对PVC/MBS共混物表面自由能的影响

ＰＶＣ和ＰＶＣ／ＭＢＳ共混物在紫外线辐照下,表面通迅速提高,最高达到５．８＊１０＾－２Ｎ／ｍ,表明ＰＶＣ和ＰＶＣ／ＭＢＳ表面发生光匀联和光氧化反应。加入ＭＢＳ可抑制ＰＶＣ光交联,但加速ＰＶＣ光氧化和光降解。ＰＶＣ／ＭＢＳ共混物在紫外光照下,由于ＰＶＣ光氧化生成羰基基表面能迅速提高,长时间光照,表面能降低,这归因子极性基团的扣 及光降解造成共混物表面密下降。

Effect of UV-irradiation on Surface Free Energy of PVC/MBS Blend

In UVirradiation the surface energy of PVC and PVC/MBS raised rapidly,the maximum would be 5.810-2N/m,which showed photocrosslinking and photooxdation took place on the surface of PVC and PVC/MBS.The use of MBS could restrain the photocrosslinking of PVC,but accelerated and raised the photooxdation and photodegradation of PVC.In UVirradiation carboxides formed due to the photooxdation of PVC.In UVirradiation carboxides formed due to the photooxdation of PVC.but accelerate and raise the photooxdation and photodegradation of PVC.In UVirradiation carboxides formed due to the photooxdation of PVC made the surface energy raised rapidly,but after a long time of the irradiation the surface energy lowered,which was a result of the loss of polar groups and the decrease of the surface density of the blend cuased by the photodegradation.