Biodegradable, UV absorber and thermal stable bioplastic films from waxy corn starch/polyvinyl alcohol blends

作者：Ramadan Yahia, Medhat E. Owda, Ragab Abouzeid, Farag Abdelhai, Hesham Y. El‐Gamil, Abdullah M. Abdo, Ali A. Ali · 发表于：Biomass Conversion and Biorefinery · 年份：2023 · DOI：10.1007/s13399-022-03683-8 · 被引用次数：27 · 研究领域：biodegradable polymer synthesis and properties、Nanocomposite Films for Food Packaging、Microplastics and Plastic Pollution

Abstract Chemically modified waxy corn starch is a promising material for biodegradable bioplastic synthesis. This work is to study the film performance and microbial enzymatic biodegradation of the film made from chemically modified waxy corn starch according to the effect of pre-gelatinization and cardanol oil with various ratios as a mixed plasticizer with sorbitol. The preparation of biodegradable bioplastic films from waxy maize acetylated di-starch adipate (WADA) and waxy maize pregelatinized acetylated di-starch adipate (PWADA) blended with polyvinyl alcohol polymer using sorbitol and cardanol oil mixture as plasticizers were performed. Characterization of biodegradability by enzymes mixture of (alpha-amylase and glucoamylase) and soil burial test. The weight loss reached 96% and the degradation percentage reached 95.5% of PWADA and these results were significantly (p < 0.05) lower than WADA; as proved by high-performance liquid chromatography, increasing osmolality is evidence of the degradation as measured by the osmometer and the physical appearance of the film indicated complete degradation after 21 days. The film morphology, chemical structure, crystallinity, transparency, and thermal stability were studied using a scanning electron microscope, Fourier-transformed infrared, X-ray diffraction, UV–Vis spectrophotometer, and thermal gravimetric analysis. As a result, under the electron microscope, PWADA films had a more homogenous surface. The films’ infra-red spectr...