Abstract

In the present work, bagasse hemicelluloses were crosslinked using citric acid as a nontoxic crosslinking agent to improve the wet strength of hemicelluloses/SPI composite films at moderate relative humidity (RH). Fourier transform infrared and thermal analysis confirmed the formation of ester crosslinks between hemicelluloses and citric acid and led to lower the degradation temperature. The wet tensile strength properties of the citric acid crosslinked hemicelluloses/SPI films in 50 − 95% RH was improved significantly, compared to the uncross-linked films. Particularly, the results indicated that the films crosslinked under 0.44 degrees of substitution showed the best comprehensive properties among all films. However, excessive addition of citric acid in the composite films might decrease the compatibility of the films and have negative effects on their performance. This study provides an effective pathway for preparation of hemicelluloses/SPI composite films with improved wet strength properties, which have a potential as packaging material for food application.

摘要

在目前的工作中，使用柠檬酸作为无毒交联剂使甘蔗渣半纤维素交联，以提高半纤维素/ SPI复合膜在中等相对湿度（RH）下的湿强度。傅里叶变换红外和热分析证实了半纤维素和柠檬酸之间酯交联的形成，并降低了降解温度。与未交联的薄膜相比，柠檬酸交联的半纤维素/ SPI薄膜在50-95％RH下的湿拉伸强度性能得到了显着改善。特别地，结果表明，在0.44取代度下交联的膜在所有膜中显示出最佳的综合性能。然而，在复合膜中过量添加柠檬酸可能会降低膜的相容性，并对其性能产生负面影响。这项研究为制备具有改善的湿强度性能的半纤维素/ SPI复合膜提供了一条有效途径，该膜具有作为食品包装材料的潜力。