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Extruded poly(ethylene-co-vinyl alcohol) composite films containing biopolymers isolated from municipal biowaste

机译：包含从城市生物垃圾中分离出的生物聚合物的挤出聚乙烯（乙烯-共-乙烯醇）复合薄膜

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Single-screw extrusion allows obtaining composite films containing poly(ethylene-co-vinyl alcohol), hereinafter EVOH, and water-soluble lignin-like biopolymers (SLP) isolated from the alkaline hydrolysate of two materials sampled from an urban waste treatment plant. During extrusion, a condensation reaction occurs between the EVOH and SLP. The products are heterogeneous. They contain a mix of EVOH-SLP copolymers with different composition and solubility properties. The films were characterized for tensile strength and water sorption properties. Young modulus and strain at break, respectively, were 2.8 GPa and 14% for neat EVOH vs. 2.1-0.9 GPa and 17-4% for the blends containing 2-15% SLP, with values decreasing upon increasing the % SLP. The blends were more hydrophilic than neat EVOH; their water sorption capacity was found to increase upon increasing the SLP content. Compared to previously reported similar blends obtained by twin-screw extrusion and solvent casting, the data for the single-screw extruded films allows discussing several aspects connected to the valorisation of blends obtained from fossil and biowaste sourced polymers.
机译：单螺杆挤出允许获得复合膜，该复合膜包含从城市废物处理厂采样的两种材料的碱性水解产物中分离出的聚乙烯醇（以下简称EVOH）和水溶性木质素样生物聚合物（SLP）。在挤出过程中，EVOH和SLP之间发生缩合反应。产品是异构的。它们包含具有不同组成和溶解度特性的EVOH-SLP共聚物的混合物。所述膜的抗张强度和吸水性能被表征。纯EVOH的杨氏模量和断裂应变分别为2.8 GPa和14％，而含2-15％SLP的混合物的杨氏模量和断裂应变分别为2.1-0.9 GPa和17-4％，随着SLP百分比的增加，数值降低。共混物比纯EVOH更亲水。发现它们的吸水能力随着SLP含量的增加而增加。与先前报道的通过双螺杆挤出和溶剂流延获得的类似共混物相比，单螺杆挤出薄膜的数据可以讨论与化石和生物废料来源的聚合物共混物的增值有关的几个方面。

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