Song Yizhao, Sun Shenglin, Hao Qian, Gao Shan, Wang Wentao, Hou Hanxue
College of Food Science and Engineering, Shandong Agricultural University, Tai'an, Shandong Province 271018, China.
College of Food Science and Engineering, Shandong Agricultural University, Tai'an, Shandong Province 271018, China.
Carbohydr Polym. 2024 Jul 15;336:122119. doi: 10.1016/j.carbpol.2024.122119. Epub 2024 Apr 2.
This study aimed to investigate the effects of polydimethylsiloxane (PDMS) with a low surface energy on the structure and physicochemical properties of starch/poly (butylene adipate-co-terephthalate) (PBAT) blown films. The film's appearance was not significantly changed after the addition of PDMS. Compared with the films without PDMS, the films with PDMS displayed a smoother surface. A 2% w/w PDMS addition resulted in the maximum mechanical properties (8.10 MPa of strength, 211.00% of modulus) and surface hydrophobicity (87°) of the films. By contrast, the film with 3% w/w PDMS showed the lowest light transmittance, water vapor (2.73 × 10 g·cm·cm·s·Pa) and oxygen permeability (9.73 × 10·cm·cm·cm·s·Pa), owing to the improved tightness of the matrix, which increased the zigzag path for molecules to pass through. Films with higher PDMS contents effectively extended the shelf life of packaged bananas and shiitake mushrooms, benefiting from the outstanding and appropriate barrier properties, according to principal component analysis results. Findings supported that high-content starch/PBAT films containing PDMS had potential in the preservation of fresh agricultural products.
本研究旨在探究具有低表面能的聚二甲基硅氧烷（PDMS）对淀粉/聚（己二酸丁二醇酯-对苯二甲酸丁二醇酯）（PBAT）吹塑薄膜结构和物理化学性质的影响。添加PDMS后，薄膜外观无显著变化。与未添加PDMS的薄膜相比，添加PDMS的薄膜表面更光滑。添加2% w/w的PDMS可使薄膜的机械性能（强度8.10 MPa，模量211.00%）和表面疏水性（87°）达到最大值。相比之下，添加3% w/w PDMS的薄膜透光率最低，水蒸气透过率（2.73×10 g·cm·cm·s·Pa）和氧气透过率（9.73×10·cm·cm·cm·s·Pa）也最低，这是由于基体的紧密性提高，增加了分子通过的曲折路径。根据主成分分析结果，PDMS含量较高的薄膜有效地延长了包装香蕉和香菇的保质期，这得益于其优异且合适的阻隔性能。研究结果表明，含PDMS的高含量淀粉/PBAT薄膜在新鲜农产品保鲜方面具有潜力。
