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首页> 外文期刊>Journal of Polymers and the Environment >Toward Greener Polymeric Blends: Study of PBAT/Thermoplastic Whey Protein Isolate/Beeswax Blends
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Toward Greener Polymeric Blends: Study of PBAT/Thermoplastic Whey Protein Isolate/Beeswax Blends

机译：迈向更环保的聚合物共混物：PBAT /热塑性乳清蛋白分离物/蜂蜡共混物的研究

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摘要

This work evaluated the effects of partial substitution of PBAT by thermoplastic whey protein isolate (WPIT) with addition of beeswax through blends processing and their morphological, mechanical, structural, thermal and rheological properties. Whey protein isolate (WPI) was denatured at 90 degrees C, using glycerol as plasticizer, to be transformed in a thermoplastic material and subsequently blended with PBAT using a torque rheometer at 130 degrees C. Addition of 10 and 30% of WPIT in the PBAT matrix was investigated with and without beeswax. Blends were pressed as films with similar to 320 mu m of thickness. Scanning electron microscopy (SEM) analysis of PBAT/WPIT blends films revealed the presence of domains. These domains are compounded of whey protein, while at the continuous phase a moderate degree of mixture between PBAT and WPIT was observed by Raman analyses. WPIT did not alter the degree of crystallinity and the glass-transition temperature (T-g) of the PBAT in the blends. Thermogravimetric curves of the blends showed decomposition stages related to WPIT and PBAT phases. Thermal stability of blends decreased in comparison to WPIT, which was associated to the cleavage of disulfide bonds of WPIT during processing and causes other kind of interaction between components. Besides, blends containing WPIT remained non-rigid polymers with Young's modulus below 70MPa. The tensile strength and elongation at break decreased due the presence of WPIT. Beeswax did not influence the thermal and mechanical properties explored in this study.
机译：这项工作评估了热塑性乳清蛋白分离物（WPIT）对PBAT的部分取代以及通过共混工艺添加蜂蜡的过程及其形态，机械，结构，热和流变特性。使用甘油作为增塑剂，将乳清蛋白分离物（WPI）在90摄氏度下变性，转化为热塑性材料，然后使用扭矩流变仪在130摄氏度下与PBAT混合。在PBAT中添加10％和30％的WPIT使用和不使用蜂蜡对基质进行了研究。将共混物压制成厚度约为320微米的薄膜。 PBAT / WPIT共混物薄膜的扫描电子显微镜（SEM）分析表明存在畴。这些结构域是乳清蛋白的复合物，而在连续相中，拉曼分析观察到了PBAT和WPIT之间适度的混合。 WPIT不会改变共混物中PBAT的结晶度和玻璃化转变温度（T-g）。共混物的热重曲线显示了与WPIT和PBAT相有关的分解阶段。与WPIT相比，共混物的热稳定性降低了，这与WPIT的二硫键在加工过程中的断裂有关，并引起了组分之间的其他相互作用。此外，含WPIT的共混物仍是杨氏模量低于70MPa的非刚性聚合物。由于存在WPIT，拉伸强度和断裂伸长率降低。蜂蜡不影响本研究中探讨的热和机械性能。

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