An approach for the compatibility of thermoplastic starch/poly (lactic acid) blends using an ester obtained from glycerol and tall oil fatty acids,Journal of Applied Polymer Science

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An approach for the compatibility of thermoplastic starch/poly (lactic acid) blends using an ester obtained from glycerol and tall oil fatty acids
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-07-28 , DOI: 10.1002/app.52876
Edwin A. Murillo ₁ , Carlos A. Ararat ₁

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This work reports the compatibilization of thermoplastic starch (TPS)/polylactic acid (PLA) blends with a glycerol ester (GE), obtained by modifying glycerol with tall oil fatty acids. The proportions of TPS/PLA studied were 50/50 and 70/30, with the GE amounts from 0 (control sample), 5, 10, 15, and 20 wt%. The effect of the compatibilizer on the structural, thermal, rheological, morphological, mechanical and biodegradation properties of the blends was evaluated. Ultraviolet visible (UV–Vis) analysis of the blends showed that GE improved the light transmission resistance of the materials. The presence of GE resulted in decreased glass transition temperature (T_g) and complex viscosity (η*) values for the blends as opposed to the control sample. Furthermore, η* decreased with the increase in GE content and the η* values were lower than 10⁵ Pa.s. Scanning electronic microscopy analysis revealed that GE improved the interfacial adhesion between TPS and PLA. The tensile modulus (149–414 MPa), tensile strength (5.60–11.6 MPa) and the biodegradability of the blends decreased with GE content, but the water resistance showed an opposite behavior. The GE acted as a plasticizer, compatibilizer and antioxidant for TPS/PLA blends.

中文翻译：

一种使用从甘油和妥尔油脂肪酸获得的酯的热塑性淀粉/聚（乳酸）混合物相容性的方法

这项工作报告了热塑性淀粉 (TPS)/聚乳酸 (PLA) 混合物与甘油酯 (GE) 的相容性，该甘油酯是通过用妥尔油脂肪酸改性甘油而获得的。研究的 TPS/PLA 比例为 50/50 和 70/30，GE 量从 0（对照样品）、5、10、15 和 20 wt% 开始。评估了增容剂对共混物的结构、热、流变、形态、机械和生物降解性能的影响。共混物的紫外可见 (UV-Vis) 分析表明，GE 提高了材料的透光性。与对照样品相反，GE 的存在导致共混物的玻璃化转变温度 ( T _g ) 和复数粘度 ( η *) 值降低。此外，η* 随着 GE 含量的增加而降低，η * 值低于 10 ⁵ Pa.s。扫描电子显微镜分析表明，GE 改善了 TPS 和 PLA 之间的界面粘附力。共混物的拉伸模量（149-414 MPa）、拉伸强度（5.60-11.6 MPa）和生物降解性随着GE含量的增加而降低，但耐水性表现出相反的行为。GE 作为 TPS/PLA 混合物的增塑剂、增容剂和抗氧化剂。

更新日期：2022-07-28

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