Abstract Waste biomass can be used as a raw material for food packaging. Different concentrations of gelatin (GEL) were introduced into the leftover rice (LR) system to form an interpenetrating polymer network (IPN) for improving the properties of the films. The structure and morphology of films were evaluated by Fourier transform infrared, scanning electron microscopy, and atomic force microscopy, which showed good compatibility between LR and GEL. The moisture content and oil absorption rate of IPN films were down by 105% and 182%, respectively, which showed better water and oil resistance than the LR film. In addition, increasing GEL concentration led to enhancement in the tensile strength of films from 2.42 to 11.40 MPa. The water contact angle value of the IPN films (117.53°) increased by 147% than the LR film (47.56°). The low haze of IPN films was obtained with the increment of the mutual entanglement of LR and GEL. The 30–50% GEL addition improved the water vapor barrier and thermal stability properties of the IPN films. This study highlights that LR as waste biomass can have a practical application in food packaging.

中文翻译：

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食品包装用剩饭/明胶互穿聚合物网络薄膜的研制

摘要 废弃生物质可作为食品包装原料。将不同浓度的明胶（GEL）引入剩饭（LR）体系中，形成互穿聚合物网络（IPN）以改善薄膜的性能。通过傅里叶变换红外、扫描电子显微镜和原子力显微镜对薄膜的结构和形貌进行了评估，表明LR和GEL之间具有良好的相容性。IPN薄膜的含水率和吸油率分别下降了105%和182%，表现出比LR薄膜更好的耐水性和耐油性。此外，增加 GEL 浓度导致薄膜的拉伸强度从 2.42 MPa 提高到 11.40 MPa。IPN薄膜的水接触角值（117.53°）比LR薄膜（47.56°）增加了147%。IPN薄膜的低雾度是随着LR和GEL相互缠结的增加而获得的。添加 30-50% 的 GEL 提高了 IPN 薄膜的水蒸气阻隔性和热稳定性。这项研究强调了 LR 作为废弃生物质可以在食品包装中得到实际应用。