粉末改性NR对PVC的增韧作用

Toughening Effect of Modified NR Powder on PVC

用粒径小于０９ｍｍ的粉末改性ＮＲ（ＰＭＮＲ）与ＰＶＣ共混，研究共混体的力学性能及ＰＭＮＲ的性质对共混体冲击强度的影响。试验结果表明，ＰＭＮＲ对ＰＶＣ有显著的增韧效果，ＰＭＮＲ用量由２５份增大到５份，共混体的Ｃｈａｒｐｙ式缺口冲击强度由５１ｋＪ·ｍ－２提高到６４３ｋＪ·ｍ－２。用扫描电镜进行的冲击断面形貌分析表明，共混体的增韧机理为剪切屈服机理。

The modified NR powder(PMNR) with the particle diameter less than 0.9 mm was blended with PVC to study the toughening effect of PMNR on PVC.The mechanical properties of the blends were investigated.It was found that the PMNR had notable toughening effect on PVC.The notched Charpy impact strength of the blend increased from 5.1 kJ·m-2 to 64.3 kJ·m-2 as the content of PMNR increased from 2.5 parts to 5 parts.The impact fractured surface morphology on SEM showed that the toughening mechanism of the blend was in accordance with that of the shear yielding.