四亚乙基五胺对PVC和PVC/NBR共混物的交联作用

Effect of TEPA on Crosslinking of PVC and PVC/NBR Blend

从硫化特性、热变形值、凝胶质量分数和物理性能等方面考察了四亚乙基五胺（ＴＥＰＡ）对ＰＶＣ和ＰＶＣ／ＮＢＲ共混物的交联作用以及ＰＶＣ和ＮＢＲ同时交联对共混物性能的影响。结果表明，ＰＶＣ／ＮＢＲ共混物中的ＰＶＣ组分交联后，共混物的物理性能和热变形性能都有所改善；ＰＶＣ和ＮＢＲ两组分同时交联可改善共混物的物理性能和热变形性能，在ＮＢＲ用量较大（６０份以上）时效果更为明显，若ＮＢＲ用量太低，则共混物热变形性能反而有所下降；交联剂ＴＥＰＡ对硫黄硫化ＮＢＲ有一定抑制作用，对共混物的物理性能影响不大。

The effect of tetraethylene pentamine(TEPA) on crosslinking of PVC and PVC/NBR blend was studied in terms of curing characteristics,heat deformation,gel content and physical properties.The results showed that the physical properties and heat deformation of PVC/NBR blend improved when the PVC portion was crosslinked,especially the PVC portion and NBR portion were simutaneously crosslinked;the effect was more significant when the NBR portion was greater(more than 60 parts),and the heat deformation of the blend increased if the NBR portion was too small;TEPA had a certain inhibitory effect on the sulfur vulcanization of NBR and little effect on the physical properties of the blend.