摘要
以马来酸酐(MA)接枝三元乙丙橡胶(EPDM)(引发剂为一种橡胶促进剂)作为EPDM/聚酰胺(PA)共混物的相容剂。研究了相容剂接枝条件及用量、PA用量对共混物力学性能和耐溶剂性能的影响。当相容剂用量为EPDM的14%(重量比)时,共混物的拉伸强度从4MPa提高到12MPa,随相容剂用量的进一步增加,共混物的拉伸性能和耐溶剂性能得到进一步改善。DSC分析表明,共混物是明显的多相体系,但通过抽提试验发现有EPDM-g-MA/PA接枝物生成,而且从扫描电镜照片上可以明显看到加入相容剂后共混物中PA相粒子明显减小,说明PA和EPDM的工艺相容性得到大大改善。
By the initiation of a rubber accelerator, grafting of maleic anhydride (MA) onto EPDM was accomplished to form a copolymer which serves as a compatibiliser for EPDM/polyamide (PA) blends. The MA grafting reactions on EPDM were carried out under various experimental conditions. It is shown that as the amount of EPDM-g-MA increases from 0 to 14 wt% based on total rubber, the tensile strentgth increases from 4MPa to 12MPa and solvent resistance is greatly improved too. SAM photos indicate that the polyamide particles in EPDM/EPDM-g-MA/PA blends are much smaller than that in EPDM/PA blends. Differential scanning calorimetry (DSC) measurement shows that EPDM/EPDM-g-MA/PA blends have two glass transition temperatures, 45. 2℃ and 48℃, corresponding to the Tg of EPDM and PA. Therefore the EPDM/EPDM-g-MA/PA vulcanisates are multiphase systems.
出处
《橡胶工业》
CAS
北大核心
1994年第1期42-47,共6页
China Rubber Industry