A composite of 60% of lanthanum stearate and 40%（mass fraction） of stearic acid was prepared and its influence on the crystallization characteristics of isotatic polypropylene （iPP） was investigated. The results s...A composite of 60% of lanthanum stearate and 40%（mass fraction） of stearic acid was prepared and its influence on the crystallization characteristics of isotatic polypropylene （iPP） was investigated. The results showed that we had found a new kind of β-crystalline form nucleating agent. The composite might induced rather high proportion of β-modification. The relative content of β-phase estimated by WAXD and DSC was 30% and 51.8% in a PP containing 2.5%（mass fraction） of the composite respectively. The isothermal crystallization at 130 ℃ and melting behavior examined by DSC revealed that the composite accelerated the overall rate of crystallization remarkably. The half crystallization period t1/2 decreased from 11 8 min of pure PP to 7 5 min of PP containing 2.5% of the composite. However, the composite had no obvious influence on crystallization mode and the size of α-crystal unit cell.展开更多
用在 5 0L固相接枝反应器中合成的等规聚丙烯接枝马来酸酐 (PP g MAH)作界面改性剂 ,制备了PP g MAH/PP/滑石粉复合材料。研究了PP g MAH/PP/滑石粉复合材料的形态结构和力学性能。结果表明 ,PP g MAH对PP/滑石粉复合物的缺口冲击强度...用在 5 0L固相接枝反应器中合成的等规聚丙烯接枝马来酸酐 (PP g MAH)作界面改性剂 ,制备了PP g MAH/PP/滑石粉复合材料。研究了PP g MAH/PP/滑石粉复合材料的形态结构和力学性能。结果表明 ,PP g MAH对PP/滑石粉复合物的缺口冲击强度、弯曲强度和拉伸强度均有增强作用 ;PP g MAH对PP/滑石粉复合物表观粘度几乎没有影响。SEM观察发现PP g展开更多
文摘A composite of 60% of lanthanum stearate and 40%（mass fraction） of stearic acid was prepared and its influence on the crystallization characteristics of isotatic polypropylene （iPP） was investigated. The results showed that we had found a new kind of β-crystalline form nucleating agent. The composite might induced rather high proportion of β-modification. The relative content of β-phase estimated by WAXD and DSC was 30% and 51.8% in a PP containing 2.5%（mass fraction） of the composite respectively. The isothermal crystallization at 130 ℃ and melting behavior examined by DSC revealed that the composite accelerated the overall rate of crystallization remarkably. The half crystallization period t1/2 decreased from 11 8 min of pure PP to 7 5 min of PP containing 2.5% of the composite. However, the composite had no obvious influence on crystallization mode and the size of α-crystal unit cell.
文摘用在 5 0L固相接枝反应器中合成的等规聚丙烯接枝马来酸酐 (PP g MAH)作界面改性剂 ,制备了PP g MAH/PP/滑石粉复合材料。研究了PP g MAH/PP/滑石粉复合材料的形态结构和力学性能。结果表明 ,PP g MAH对PP/滑石粉复合物的缺口冲击强度、弯曲强度和拉伸强度均有增强作用 ;PP g MAH对PP/滑石粉复合物表观粘度几乎没有影响。SEM观察发现PP g
