This paper reports a new kind catalytic system to produce linear low density polyethylene(LLDPE) from ethylene alone in a single reactor by combining the ability of Ti(OBu n ) 4/AlEt 3 to produce 1 butene with the abi...This paper reports a new kind catalytic system to produce linear low density polyethylene(LLDPE) from ethylene alone in a single reactor by combining the ability of Ti(OBu n ) 4/AlEt 3 to produce 1 butene with the ability of [Me 2SiN t BuInd]ZrCl 2/MAO to copolymerize ethylene with 1 butene. It was found that the dual functional catalytic system has high activity and get the good polymer with density ranging from 0.91-0.95 g/cm 3 in ethylene polymerization.展开更多
为比较不同厚度的低密度聚乙烯(LDPE)膜对平菇保鲜效果的影响,分别以0.015mm、0.030mm和0.045 mm 3种不同厚度的LDPE膜为包装材料,在模拟超市冷鲜货架温湿度条件(温度约14±1℃,贮藏环境相对湿度约85%)下,探讨了不同厚度LDPE膜对平...为比较不同厚度的低密度聚乙烯(LDPE)膜对平菇保鲜效果的影响,分别以0.015mm、0.030mm和0.045 mm 3种不同厚度的LDPE膜为包装材料,在模拟超市冷鲜货架温湿度条件(温度约14±1℃,贮藏环境相对湿度约85%)下,探讨了不同厚度LDPE膜对平菇保鲜效果的影响。结果表明:与0.015mm膜和0.030mm膜相比,0.045 mm LDPE膜虽能显著提高平菇的失重率,保持包装内的较高的CO2体积分数和较低O2的体积分数(P<0.05);但在贮藏的第4天后,0.045mm LDPE膜对抑制平菇呼吸强度、维持细胞膜透性,提高平菇感官分值的效果显著低于0.030mm LDPE膜(P<0.05)。3种不同厚度的保鲜膜以0.030mm LDPE膜对平菇的保鲜效果最佳。展开更多
文摘This paper reports a new kind catalytic system to produce linear low density polyethylene(LLDPE) from ethylene alone in a single reactor by combining the ability of Ti(OBu n ) 4/AlEt 3 to produce 1 butene with the ability of [Me 2SiN t BuInd]ZrCl 2/MAO to copolymerize ethylene with 1 butene. It was found that the dual functional catalytic system has high activity and get the good polymer with density ranging from 0.91-0.95 g/cm 3 in ethylene polymerization.
文摘为比较不同厚度的低密度聚乙烯(LDPE)膜对平菇保鲜效果的影响,分别以0.015mm、0.030mm和0.045 mm 3种不同厚度的LDPE膜为包装材料,在模拟超市冷鲜货架温湿度条件(温度约14±1℃,贮藏环境相对湿度约85%)下,探讨了不同厚度LDPE膜对平菇保鲜效果的影响。结果表明:与0.015mm膜和0.030mm膜相比,0.045 mm LDPE膜虽能显著提高平菇的失重率,保持包装内的较高的CO2体积分数和较低O2的体积分数(P<0.05);但在贮藏的第4天后,0.045mm LDPE膜对抑制平菇呼吸强度、维持细胞膜透性,提高平菇感官分值的效果显著低于0.030mm LDPE膜(P<0.05)。3种不同厚度的保鲜膜以0.030mm LDPE膜对平菇的保鲜效果最佳。
