两种共聚聚丙烯PPH–M12N流变性能的对比

摘要

The rotating rheometer,torque rheometer,thread circle,melt flow rate meter were used to study the rheological properties,melt flow rate,torque rheological properties,loss modulus and storage modulus,complex viscosity of the two kinds of new pipe type PP (segmented polymerization by propylene and 1-octene with different content,PPH–M12N–1 and PPH–M12N–2) and another pipe type PP as comparing sample. The results indicate that there are some differences in the molecular chain structure and the rheological properties of the three PP. PPH–M12N–1 (propylene:1-octene =4:1) has a higher melt mass flow rate and processing fluidity than PPH–M12N–2 (propylene:1-octene =3:2)(The melt flow rate of PPH–M12N–1 is 3.34 g/10 min,and the melt flow rate of PPH–M12N–2 is 1.24 g/10 min). In particular,the zero shear viscosity of PPH–M12N–1 is lower (The zero shear viscosity of PPH–M12N–1 is 2 087 Pa·s,and the zero shear viscosity of PPH–M12N–2 is 3 478 Pa·s.) and it is suitable for molding under complex conditions. The processing properties of PPH–M12N–2 are similar as the comparing sample.%应用旋转流变仪、转矩流变仪、螺纹圈、熔体流动速率(MFR)仪等测试手段,研究了两种管材用新型聚丙烯(PP)(丙烯与1–辛烯分段共聚物,PPH–M12N–1与PPH–M12N–2)与一种对比牌号PP的MFR、转矩流变性能、损耗模量与储能模量、复数黏度等性能.研究结果表明,三种PP的分子链结构及流变性能均有所差异,PPH–M12N–1 (丙烯:1–辛烯=4:1)比PPH–M12N–2 (丙烯:1–辛烯=3:2)具有更高的熔体质量流动速率和加工流动性(PPH–M12N–1的MFR为3.34 g/10 min,PPH–M12N–2的MFR为1.24 g/10 min),尤其是PPH–M12N–1的零剪切黏度(PPH–M12N–1零剪切黏度为2087 Pa?s,PPH–M12N–2的零剪切黏度为3478 Pa?s)更低,适合复杂条件下的成型加工,PPH–M12N–2的成型加工性能与对比牌号聚丙烯相近.