Grafted barley husk/poly (vinyl alcohol)/starch composite films: effect of fatty acid chain length and grafted barley husk loading

IF 2.4 3区化学 Q3 POLYMER SCIENCE Iranian Polymer Journal Pub Date : 2024-04-16 DOI:10.1007/s13726-024-01311-y

Aanchal Mittal, Sangeeta Garg, Shailendra Bajpai

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Abstract

The effect of incorporation of barley husk (BH) grafted with different fatty acids (lauric acid: LBH; palmitic acid: PBH; arachidic acid: ABH) on the physicochemical properties of cross-linked PVA/starch based composite films was studied at different loadings (0.2–2)%. Surface morphology of the films showed that grafted BH dispersed well within the matrix as compared to BH enabling them to provide the greatest reinforcing effect. Composite films containing grafted BH showed higher tensile strength, water resistant properties, thermal stability as well as barrier properties compared to composite films containing BH. At optimum loading (1%), tensile strength of the composite film, containing ABH, was 22.9 MPa, and 23.5% and 31.6% higher than films containing LBH (17.4 MPa) and PBH (18.54 MPa), respectively. Composite films prepared with ABH exhibited the highest values of water contact angle, water vapor, and oxygen permeability among all composite films owing to the incorporation of longest hydrophobic aliphatic chain and provides more hindrance for transmission. The activation energy values of thermal degradation for composite film directly indicate their thermal stability were calculated as 203.37, 222.62 and 366.52 kJ at 1% loading of LBH, PBH, and ABH, respectively. Thus, composite film containing ABH at 1% showed maximum improvement in physicochemical properties followed by composite films containing 1% PBH and LBH. This study provides the alternatives for choosing the most effective composite film, which can be a nature-friendly substitute for non-degradable packaging films and it may help to maintain the circular economy.

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接枝大麦壳/聚（乙烯醇）/淀粉复合膜：脂肪酸链长度和接枝大麦壳负载量的影响

研究了加入不同脂肪酸（月桂酸：LBH；棕榈酸：PBH；花生酸：ABH）接枝的大麦壳（BH）对不同负载量（0.2-2）% 的交联 PVA/ 淀粉基复合薄膜的理化性质的影响。薄膜的表面形态显示，与 BH 相比，接枝 BH 能很好地分散在基质中，从而产生最大的增强效果。与含有 BH 的复合薄膜相比，含有接枝 BH 的复合薄膜具有更高的拉伸强度、耐水性、热稳定性和阻隔性。在最佳添加量（1%）下，含有 ABH 的复合薄膜的拉伸强度为 22.9 兆帕，比含有 LBH（17.4 兆帕）和 PBH（18.54 兆帕）的薄膜分别高出 23.5% 和 31.6%。ABH 制备的复合薄膜的水接触角、水蒸气透过率和氧气透过率在所有复合薄膜中都是最高的，这是因为 ABH 中含有最长的疏水脂肪族链，为透射提供了更大的阻碍。在 LBH、PBH 和 ABH 含量为 1%的情况下，复合薄膜的热降解活化能值分别为 203.37、222.62 和 366.52 kJ，直接表明了它们的热稳定性。因此，ABH 含量为 1%的复合薄膜在理化特性方面的改善最大，其次是 PBH 和 LBH 含量为 1%的复合薄膜。这项研究为选择最有效的复合膜提供了替代方案，它可以成为不可降解包装膜的自然友好型替代品，并有助于维持循环经济。

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来源期刊

Iranian Polymer Journal 化学-高分子科学

CiteScore

4.90

自引率

9.70%

发文量

107

审稿时长

2.8 months

期刊介绍： Iranian Polymer Journal, a monthly peer-reviewed international journal, provides a continuous forum for the dissemination of the original research and latest advances made in science and technology of polymers, covering diverse areas of polymer synthesis, characterization, polymer physics, rubber, plastics and composites, processing and engineering, biopolymers, drug delivery systems and natural polymers to meet specific applications. Also contributions from nano-related fields are regarded especially important for its versatility in modern scientific development.