纸质出版日期:2000-2-20
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研究了丁腈橡胶(NBR) 对聚甲醛(POM) 树脂的增韧机理,并比较了POM/NBR 体系和POM/ 热塑性聚氨酯(TPU) 体系的异同.结果表明,高丙烯腈(AN) 含量的NBR 有着和TPU 相近的溶度积参数,且其分子上的氰(CN) 基或双键对POM 分解时产生的甲醛及大分子自由基的捕捉作用,有利于改善NBR 和POM 之间相容性,因而可和POM 树脂形成良好的合金体系;当NBR 含量达40wt% 时,POM/NBR 体系出现脆韧转变,从逾渗机制、剪切带机制、类互穿网络(IPN) 作用机制等角度进行考察的结果证明,NBR 对POM 树脂的增韧行为以及POM/NBR 共混合金体系的脆韧转变规律与POM/TPU 体系相一致.
The toughening mechanism of POM/NBR blends was studied. The results indicate that NBR with high AN content has similar solubility parameter with TPU, and the CN groups or double bond of NBR can capture the formaldehyde or macromolecular free radicals which were produced during POM degradation. This can enhance the compatibility between NBR and POM, thus they can form good alloy. When NBR content reaches 40wt%, the alloy exhibits brittle-ductile transition. The investigation from percolation, rubber-band and quasi-IPN mechanisms indicate that,toughening behavior of NBR to POM and the alloy's B-D transition rule are consistent with POM/TPU system.
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