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首页> 外文期刊>Polymers & Polymer Composites >Blending Techniques Affecting Mechanical and Morphological Properties of Fly Ash/LDPE and CaCO3/LDPE Composites
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Blending Techniques Affecting Mechanical and Morphological Properties of Fly Ash/LDPE and CaCO3/LDPE Composites

机译：影响粉煤灰/ LDPE和CaCO3 / LDPE复合材料力学和形态性能的共混技术

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摘要

The effects of blending methods on mechanical and morphological properties of CaCO3/LDPE and fly ash/LDPE composites were investigated as a function of filler loadings. The CaCO/LDPE and fly ash/LDPE composites considered in this work were prepared by dry blending (high-speed mixer) and melt blending (using single- and twin-screw extruders). It was found that as the CaCO3 or FA loading was increased, the modulus and hardness for all blending techniques were increased, due to rigidities of the fillers and increased crystallinity level of the composites. Increasing the CaCO3 and FA loadings decreased the ultimate mechanical properties (tensile strength, elongation at break and impact strength) due to poor dispersion and interfacial defects of the composites. Composites prepared by the twin-screw extruder had the best mechanical properties as compared to those prepared by the dry blending or single-screw extruder, except for the impact strength. The overall mechanical properties of LDPE composites with CaCO3 were similar to those with FA particles, but the changes in the composite properties with CaCO3 particles were more sensitive than those with FA particles, this being associated with the differences in particle characteristics and dispersion level of CaCO3 or FA fillers.
机译：研究了共混方法对CaCO3 / LDPE和粉煤灰/ LDPE复合材料的力学和形态性能的影响，其与填料含量有关。本工作中考虑的CaCO / LDPE和粉煤灰/ LDPE复合材料是通过干混（高速混合机）和熔融共混（使用单螺杆和双螺杆挤出机）制备的。已发现，随着CaCO3或FA含量的增加，由于填料的刚度和复合材料结晶度的提高，所有混合技术的模量和硬度均增加。由于复合材料分散性差和界面缺陷，增加的CaCO3和FA含量会降低最终的机械性能（拉伸强度，断裂伸长率和冲击强度）。与通过干混或单螺杆挤出机制备的复合材料相比，由双螺杆挤出机制备的复合材料具有最佳的机械性能，除了冲击强度。带有CaCO3的LDPE复合材料的整体力学性能与带有FA颗粒的LDPE复合材料相似，但是与带有FA颗粒的LDPE复合材料相比，其复合性能的变化更敏感，这与CaCO3的颗粒特性和分散度的差异有关或FA填料。

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