Effect of polydimethylsiloxane on the structure and barrier properties of starch/PBAT composite films

Yizhao Song; Shenglin Sun; Qian Hao; Shan Gao; Wentao Wang; Hanxue Hou

doi:10.1016/j.carbpol.2024.122119

Effect of polydimethylsiloxane on the structure and barrier properties of starch/PBAT composite films

Carbohydr Polym. 2024 Jul 15:336:122119. doi: 10.1016/j.carbpol.2024.122119. Epub 2024 Apr 2.

Authors

Yizhao Song¹, Shenglin Sun¹, Qian Hao¹, Shan Gao¹, Wentao Wang², Hanxue Hou³

Affiliations

¹ College of Food Science and Engineering, Shandong Agricultural University, Tai'an, Shandong Province 271018, China.
² College of Food Science and Engineering, Shandong Agricultural University, Tai'an, Shandong Province 271018, China. Electronic address: wangwt@sdau.edu.cn.
³ College of Food Science and Engineering, Shandong Agricultural University, Tai'an, Shandong Province 271018, China. Electronic address: hhx@sdau.edu.cn.

PMID: 38670751
DOI: 10.1016/j.carbpol.2024.122119

Abstract

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^-11 g·cm·cm²·s^-1·Pa^-1) and oxygen permeability (9.73 × 10^-13·cm³·cm·cm^-2·s^-1·Pa^-1), 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.

Keywords: Barrier properties; Biodegradable packaging; Extrusion blowing; Hydrophobicity; Polydimethylsiloxane.