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Effect of lanthanum‐modified magnesium silicate on isotactic polypropylene crystallization in composite materials during shear flow
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2020-06-29 , DOI: 10.1002/pen.25422 Wojciech H. Bednarek 1 , Filip Ciesielczyk 1 , Majka Odalanowska 1 , Dominik Paukszta 1 , Adam Piasecki 2
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2020-06-29 , DOI: 10.1002/pen.25422 Wojciech H. Bednarek 1 , Filip Ciesielczyk 1 , Majka Odalanowska 1 , Dominik Paukszta 1 , Adam Piasecki 2
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The activity of isotactic polypropylene (iPP) nucleating additives during shear flow of composite materials is still not entirely explained. In current work the sol‐gel method was employed to synthesize MgO·SiO2 filler, surface‐modified with trivalent lanthanum. The crystallization of commercial iPP in the presence of 0.5% by weight La3+ modified or unmodified silicates was analyzed. The wide angle X‐ray scattering analysis proved that the presence of even small amount of filler influences significantly on supermolecular structure of iPP. The results of microscope observations confirmed that the lanthanum‐modified filler shows the nucleating ability for iPP. In that case a significant reduction of crystallization induction time was noticed. The investigation of iPP crystallization in composites after shear treatment confirmed that the increase of shear rate reduces the nucleating ability of additives. Moreover, the flow of filler particles during shearing may impede the shear‐induced crystallization phenomenon.
中文翻译：
镧改性硅酸镁对复合材料剪切流动过程中全同立构聚丙烯结晶的影响
在复合材料的剪切流动过程中，全同立构聚丙烯（iPP）成核添加剂的活性仍未完全解释。在当前工作中，采用溶胶-凝胶法合成了用三价镧表面改性的MgO·SiO 2填料。在0.5％（重量）La 3+存在下，商用iPP的结晶分析了改性或未改性的硅酸盐。广角X射线散射分析证明，即使少量的填料也会对iPP的超分子结构产生显着影响。显微镜观察结果证实，镧改性的填料具有iPP的成核能力。在那种情况下，注意到明显缩短了结晶诱导时间。剪切处理后复合材料中iPP结晶的研究证实，剪切速率的增加会降低添加剂的成核能力。此外，剪切过程中填料颗粒的流动可能会阻碍剪切引起的结晶现象。
更新日期：2020-06-29
中文翻译：
镧改性硅酸镁对复合材料剪切流动过程中全同立构聚丙烯结晶的影响
在复合材料的剪切流动过程中，全同立构聚丙烯（iPP）成核添加剂的活性仍未完全解释。在当前工作中，采用溶胶-凝胶法合成了用三价镧表面改性的MgO·SiO 2填料。在0.5％（重量）La 3+存在下，商用iPP的结晶分析了改性或未改性的硅酸盐。广角X射线散射分析证明，即使少量的填料也会对iPP的超分子结构产生显着影响。显微镜观察结果证实，镧改性的填料具有iPP的成核能力。在那种情况下，注意到明显缩短了结晶诱导时间。剪切处理后复合材料中iPP结晶的研究证实，剪切速率的增加会降低添加剂的成核能力。此外，剪切过程中填料颗粒的流动可能会阻碍剪切引起的结晶现象。
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