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首页> 外文期刊>Journal of Polymers and the Environment >Effect of Oxidized Starch on Morphology, Rheological and Tensile Properties of Low-Density Polyethylene/Linear Low-Density Polyethylene/Thermoplastic Oxidized Starch Blends
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Effect of Oxidized Starch on Morphology, Rheological and Tensile Properties of Low-Density Polyethylene/Linear Low-Density Polyethylene/Thermoplastic Oxidized Starch Blends

机译：氧化淀粉对低密度聚乙烯/线性低密度聚乙烯/热塑性氧化淀粉混合物形态，流变和拉伸性能的影响

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In this work, morphology, rheological and tensile properties of low-density polyethylene/linear low-density polyethylene/thermoplastic oxidized starch (LDPE/LLDPE/TPOS) blends are studied. The blends of LDPE/LLDPE (70/30, w/w) containing 0–20 wt% TPOS in the presence of 3 wt% of PE-grafted maleic anhydride (PE-g-MA) as a compatibilizer are prepared by a twin screw extruder and then converted to appropriate thin films using an extrusion film blowing machine. Scanning electron microscopic images show that there is a relative good dispersion of oxidized starch particles in PE matrices. However, as TPOS content in the blends increases, the starch particle size increases too. The rheological analyses indicate that TPOS can decrease the elasticity and viscosity of the blends. The LDPE/LLDPE/TPOS blends show power-law behavior and as the TPOS content increases the power-law exponent (n) and consistency index (K) decrease. The ultimate tensile strength and elongation at break of the final blend films reduce, when TPOS content increases from 5 to 20 wt%. However, the required mechanical properties for packaging applications are achieved when 10 wt% oxidized starch is added, according to ASTM D4635.
机译：在这项工作中，研究了低密度聚乙烯/线性低密度聚乙烯/热塑性氧化淀粉（LDPE / LLDPE / TPOS）共混物的形态，流变和拉伸性能。通过双胞胎制备含有0-20 wt％TPOS的LDPE / LLDPE（70/30，w / w）的共混物，其中存在3 wt％的PE接枝马来酸酐（PE-g-MA）作为增容剂螺杆挤出机，然后使用挤出吹膜机将其转化为合适的薄膜。扫描电子显微镜图像显示，氧化淀粉颗粒在PE基质中有相对较好的分散性。但是，随着共混物中TPOS含量的增加，淀粉的粒径也随之增加。流变学分析表明，TPOS可以降低共混物的弹性和粘度。 LDPE / LLDPE / TPOS共混物显示幂律行为，并且随着TPOS含量的增加，幂律指数（n）和一致性指数（K）降低。当TPOS含量从5 wt％增加到20 wt％时，最终共混薄膜的极限拉伸强度和断裂伸长率降低。但是，根据ASTM D4635，当添加10 wt％的氧化淀粉时，可以达到包装应用所需的机械性能。

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