Oliver-Cuenca Victor, Muñoz-Menzinger Ana, Arrieta Marina P, López Daniel, Peponi Laura
Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC, Calle Juan de la Cierva 3, 28006 Madrid, Spain.
Departamento de Ingeniería Química Industrial y del Medio Ambiente, Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid (ETSII-UPM), Calle José Gutiérrez Abascal 2, 28006 Madrid, Spain.
Polymers (Basel). 2025 Jun 26;17(13):1763. doi: 10.3390/polym17131763.
Biodegradable and bio-based polymers, such as starch and gelatin, are emerging as an important alternative to the use of conventional polymers. In this work, different proportions (1/1, 1/1.5, 1/2, and 1/2.5) of these bio-based polymers will be investigated, with the primary objective of considering their strong moisture dependence as an advantage instead of a problem, as commonly considered. For this interesting challenge, the humidity-activated shape memory effect has been studied in both neat and plasticized starch. Additionally, for the first time, to the best of our knowledge, the shape-memory behavior activated by humidity in gelatin, as well as in starch/gelatin blends, is reported. In all cases, starch, gelatin, and their plasticized blends show excellent values in terms of strain fixity ratio, obtaining values of about 100% in all cases, and strain recovery ratio, with values higher than 90% for the samples studied. Moreover, considering their potential application as food packaging, mechanical response, wettability, water permeability, water uptake rate, and roughness is also studied in this work, taking into account the effect of the different amounts of gelatin on the final behavior of the materials.
可生物降解和基于生物的聚合物，如淀粉和明胶，正成为传统聚合物使用的一种重要替代物。在这项工作中，将研究这些基于生物的聚合物的不同比例（1/1、1/1.5、1/2和1/2.5），主要目的是将它们对水分的强烈依赖性视为一种优势而非如通常所认为的问题。针对这一有趣的挑战，已在纯淀粉和增塑淀粉中研究了湿度激活的形状记忆效应。此外，据我们所知，首次报道了明胶以及淀粉/明胶共混物中湿度激活的形状记忆行为。在所有情况下，淀粉、明胶及其增塑共混物在应变固定率方面都表现出优异的值，在所有情况下均获得约100%的值，并且在应变恢复率方面，所研究的样品的值高于90%。此外，考虑到它们作为食品包装的潜在应用，这项工作还研究了材料的机械响应、润湿性、水渗透性、吸水率和粗糙度，同时考虑了不同量的明胶对材料最终性能的影响。
