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首页> 外文期刊>Journal of Applied Polymer Science >High density polyethylene/micro calcium carbonate composites: A study of the morphological, thermal, and viscoelastic properties
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High density polyethylene/micro calcium carbonate composites: A study of the morphological, thermal, and viscoelastic properties

机译：高密度聚乙烯/微碳酸钙复合材料：形态，热和粘弹性的研究

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摘要

High density polyethylene (HDPE) with micro calcium carbonate (CaCO _3) masterbatch was pellet- ized by using a twin screw extruder and different ASTM specimens were molded by an injection molding machine. The morphology of the composites was characterized by scanning electron microscopy (SEM) and Image Analysis software. The dispersion and interfacial interaction between CaCO3 and the polymer matrix were also investigated by SEM. The thermal properties of HDPE and its composites were investigated by differential scanning calorimetry (DSC). The crystallization process of the composites samples was found to be slightly different than that of the neat HDPE. Otherwise the presence of CaCO_3 did not have a considerable effect on the melting behavior of the composites. Thermogravimet- ric analysis (TGA) revealed that the composites had better thermal stability than the neat HDPE resin as indicated by a higher temperature of 50% weight loss (T_(50%)) for the composites as compared to that of the neat resin. The viscoelastic properties of the composites and HDPE were also investigated via torsional and rotational techniques. The presence of CaCO_3 increased the shear modulus at low frequency of the composites at 80°C over that of the neat resin. However, at higher frequencies, the difference between the neat resin and the composites' shear modulus was less than that at low frequencies. The complex viscosity of the composite increased upon the addition of CaCO_3. However, the shear sensitivities of the neat resin and the microcomposite were similar.
机译：使用双螺杆挤出机将高密度聚乙烯（HDPE）与微碳酸钙（CaCO_3）母粒制粒，并通过注塑机将不同的ASTM样品成型。用扫描电子显微镜（SEM）和图像分析软件对复合材料的形貌进行表征。还通过SEM研究了CaCO 3与聚合物基质之间的分散和界面相互作用。通过差示扫描量热法（DSC）研究了HDPE及其复合材料的热性能。发现复合材料样品的结晶过程与纯HDPE的结晶过程略有不同。否则，CaCO 3的存在对复合材料的熔融行为没有显着影响。热重分析（TGA）表明，与纯HDPE树脂相比，复合材料具有更好的热稳定性，这是因为与纯树脂相比，复合材料的重量损失较高（T_（50％）50％）。还通过扭转和旋转技术研究了复合材料和HDPE的粘弹性。 CaCO_3的存在增加了复合材料在80°C时的低频剪切模量，超过了纯树脂。然而，在较高的频率下，纯树脂和复合材料的剪切模量之间的差异要小于低频下的差异。加入CaCO_3后，复合材料的复数粘度增加。但是，纯树脂和微复合材料的剪切敏感性相似。

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