用偶联剂改性的滑石粉(T a lc)与聚丙烯(PP)共混制备T a lc/PP复合材料,测试了复合材料的力学性能。用广角X射线衍射仪对聚丙烯的结晶状况进行了表征,计算了复合材料中聚丙烯的结晶度;用扫描电镜观察了样条的断口形貌,讨论了滑石粉填充...用偶联剂改性的滑石粉(T a lc)与聚丙烯(PP)共混制备T a lc/PP复合材料,测试了复合材料的力学性能。用广角X射线衍射仪对聚丙烯的结晶状况进行了表征,计算了复合材料中聚丙烯的结晶度;用扫描电镜观察了样条的断口形貌,讨论了滑石粉填充量对材料结晶性能与相态结构的影响,以及PP相结晶度和体系的微相结构对复合材料的拉伸、弯曲及冲击性能的影响。实验结果表明,滑石粉的加入对复合材料的结晶行为、相态结构和力学性能有影响。在15%的滑石粉填充量时,聚丙烯相的结晶度达到最大值,材料的拉伸强度、弯曲强度也基本上达到最大值,而冲击强度却降到最低。扫描电镜照片显示,PP基体的结晶形态与复合材料的相态结构随滑石粉含量的改变而变化。展开更多
Effects of an ionic liquid,1-n-tetradecyl-3-methylimidazolium bromide([C14MIM]Br),as a foaming additive on the foaming behavior of polypropylene(PP) by supercritical CO2 technique was reported.Mass ratio of PP/[C14MIM...Effects of an ionic liquid,1-n-tetradecyl-3-methylimidazolium bromide([C14MIM]Br),as a foaming additive on the foaming behavior of polypropylene(PP) by supercritical CO2 technique was reported.Mass ratio of PP/[C14MIM]Br up to 100∶10 was incorporated via melt blending.The melting behavior and fractured morphology of PP/[C14MIM]Br samples were investigated by differential scanning calorimetry(DSC) and scanning electron microscopy(SEM),respectively.The CO2 sorption was measured by commonly accep-ted gravimetric method.The results of DSC and CO2 sorption experiments show that [C14MIM]Br has little effect on the crystallinity,melting point and the mass uptake of CO2 of PP.SEM images reveal that [C14MIM]Br forms a well-dispersed phase,whose size increases with [C14MIM]Br content,in the PP matrix.The foamed PP/[C14MIM]Br samples exhibit close cell structure,increased cell size and decreased unfoamed region and bulk density,compared with pure PP foamed under the same saturation conditions of 155 ℃/10 MPa,indicating ionic liquid [C14MIM]Br has significant effect on the foaming behavior of PP.展开更多
文摘用偶联剂改性的滑石粉(T a lc)与聚丙烯(PP)共混制备T a lc/PP复合材料,测试了复合材料的力学性能。用广角X射线衍射仪对聚丙烯的结晶状况进行了表征,计算了复合材料中聚丙烯的结晶度;用扫描电镜观察了样条的断口形貌,讨论了滑石粉填充量对材料结晶性能与相态结构的影响,以及PP相结晶度和体系的微相结构对复合材料的拉伸、弯曲及冲击性能的影响。实验结果表明,滑石粉的加入对复合材料的结晶行为、相态结构和力学性能有影响。在15%的滑石粉填充量时,聚丙烯相的结晶度达到最大值,材料的拉伸强度、弯曲强度也基本上达到最大值,而冲击强度却降到最低。扫描电镜照片显示,PP基体的结晶形态与复合材料的相态结构随滑石粉含量的改变而变化。
文摘Effects of an ionic liquid,1-n-tetradecyl-3-methylimidazolium bromide([C14MIM]Br),as a foaming additive on the foaming behavior of polypropylene(PP) by supercritical CO2 technique was reported.Mass ratio of PP/[C14MIM]Br up to 100∶10 was incorporated via melt blending.The melting behavior and fractured morphology of PP/[C14MIM]Br samples were investigated by differential scanning calorimetry(DSC) and scanning electron microscopy(SEM),respectively.The CO2 sorption was measured by commonly accep-ted gravimetric method.The results of DSC and CO2 sorption experiments show that [C14MIM]Br has little effect on the crystallinity,melting point and the mass uptake of CO2 of PP.SEM images reveal that [C14MIM]Br forms a well-dispersed phase,whose size increases with [C14MIM]Br content,in the PP matrix.The foamed PP/[C14MIM]Br samples exhibit close cell structure,increased cell size and decreased unfoamed region and bulk density,compared with pure PP foamed under the same saturation conditions of 155 ℃/10 MPa,indicating ionic liquid [C14MIM]Br has significant effect on the foaming behavior of PP.
