无规共聚聚丙烯反应挤出接枝马来酸酐研究

Study on PPR Grafted with Maleic Anhydride by Reactive Extrusion

使用高长径比的接枝型反应挤出机,研究了在反应挤出过程中马来酸酐接枝无规共聚聚丙烯(PPR)(PPR-g- MAH)的熔融反应规律。研究反应单体马来酸酐(MAH)用量和过氧化二异丙苯(DCP)用量对产物PPR-g-MAH接枝率及熔体流动速率的影响。结果表明,最佳配方为MAH质量分数为2.0％,DCP质量分数为0.15％,此时产物的接枝率为0.55％,熔体流动速率为4.8g／10min。通过红外光谱、差示扫描量热仪(DSC)、广角X射线衍射仪(WAXD)分析表明,接枝物有明显的酐基吸收峰,表明PPR分子链确实接枝上强极性的酐基;接枝物的熔点与原料相同;晶型和结晶度基本没有发生改变。

The reaction rule of PPR melt grafted with maleic anhydride （MA） during reactive extrusion was studied in a high L/D reactive extruder. The effects of rnaleic anhydride and dicumyl peroxide （DCP） content on grafting degree and melt flow rate of the product were studied . The results show that the optimal condition is 2.0 % MA and 0.15 % DCP, Grafting degree of the best product is 0. 55% and melt flow rate is 4.8 g/10 min. FT-IR, DSC and WAXD curves of PPR-g-MA show that the grafted product has an evident anhydride peak, which indicates the anhydride is grafted onto PPR molecule chain. Melting point is similar to raw materials. The crystal phase and crystallinity remain unchanged.