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首页> 外文会议>Regional Conference of the Polymer Processing Society >A Study on Material Optimization for Polypropylene Nanocomposites Based on Layered Silicates Using Elongational Flow Devices
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A Study on Material Optimization for Polypropylene Nanocomposites Based on Layered Silicates Using Elongational Flow Devices

机译：基于伸长流量装置的层状硅酸盐的聚丙烯纳米复合材料的材料优化研究

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Over the last years, the use of nano-reinforced polymers increased due to their superior mechanical, thermal and rheological properties. Polymer nanocomposites (PNCs) which are based on layered silicates feature a higher Young's-Modulus and increased thermal conductivity. The aim of this study was to improve the material properties for polypropylene PNCs based on layered silicates by using elongational flow generating devices with super-imposed shear- and elongational flow and optimized nozzle geometries. In order to gain knowledge about the differences in influence for various nozzle geometries, five different hyperbolical and conical nozzles were designed. The varying factors are the nozzle length, the exit radius and the injection speed which correlates with the elongation rate and shear rate. The influence of these parameters was tested for two different materials with a full factorial 2~3 design (DoE). The first material was a lower viscous homopolymer and the second material a higher viscous block copolymer. The influence of the investigated factors on intercalation and exfoliation was checked with SAXS-measurements. The results of the tensile tests showed that elongational flow leads to substantial increase in Young's Modulus especially for the lower viscous homopolymer up to 60 % compared to virgin PP. The analysis further showed that best results were achieved with a hyperbolical nozzle providing a low level of elongation and low elongation rate respectively.
机译：在过去几年中，由于其优越的机械，热和流变性能，使用纳米增强聚合物的使用增加。基于层状硅酸盐的聚合物纳米复合材料（PNC）具有更高的杨氏模量和增加的导热率。本研究的目的是通过使用具有超施加的剪切和伸长流量和优化的喷嘴几何形状的延长流动产生装置来改善基于层状硅酸盐的聚丙烯PNC的材料特性。为了获得关于各种喷嘴几何形状的影响的差异，设计了五种不同的双曲线和锥形喷嘴。变化的因素是喷嘴长度，出口半径和喷射速度，其与伸长率和剪切速率相关。使用完整因子2〜3设计（DOE）对两种不同材料进行测试的影响。第一材料是较低粘性均聚物和第二材料是较高粘性嵌段共聚物。通过淋巴测量检查研究对嵌入和剥离和剥离的影响。拉伸试验的结果表明，与原始PP相比，延长流量尤其是较低粘性均聚物的杨氏模量的大幅增加。该分析进一步表明，通过双曲线喷嘴达到最佳结果，分别提供低水平的伸长率和低伸长率。

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