Liu Fengsong, Xiao Xinglong, Zhang Yan, Bai Hong, Xu Hao, Zhang Ziqiang, Lin Yihan, Yu Long, Cao Yifang
School of Food Science and Engineering, South China University of Technology, Guangzhou510640, China.
College of Life and Geographic Sciences, Kashgar University, Kashi844000, China.
ACS Appl Mater Interfaces. 2023 Sep 27;15(38):45322-45335. doi: 10.1021/acsami.3c10676. Epub 2023 Sep 14.
The hydrophobic modification of poly(vinyl alcohol) (PVA) film as a biodegradable packaging material has received significant attention in recent research. Despite the use of stearic acid (SA) as a coating for the PVA film, a challenge persists due to the poor compatibility between SA and PVA. This study addressed the aforementioned issue by utilizing (3-aminopropyl)trimethoxysilane (APTMS) as a bridging agent to establish a connection between the hydrophilic PVA film and the hydrophobic SA coating through hydrogen bonding and chemical reactions. First, SEM and EDS analyses confirmed the enhanced interfacial compatibility between the SA coating and the PVA film. Subsequently, the results from H NMR, FTIR, and XPS experiments presented evidence of hydrogen bonding and chemical reactions among APTMS, SA, and the PVA film. Interestingly, the PVA-APTMS-SA film demonstrated a contact angle of 120.77°, a water absorption of 7.81%, and a water vapor transmission rate of 8.69 g/m/h. Furthermore, such a composite film displayed exceptional adhesion performance, requiring detachment stresses of 9.86 ± 0.91 and 6.17 ± 0.75 MPa when tested on glass and marble surfaces, respectively. In conclusion, the PVA-APTMS-SA film exhibited significant potential in extending the freshness of fresh-cut apples, making it a promising eco-friendly packaging material for food preservation.
作为一种可生物降解的包装材料，聚乙烯醇（PVA）薄膜的疏水改性在最近的研究中受到了广泛关注。尽管使用硬脂酸（SA）作为PVA薄膜的涂层，但由于SA与PVA之间的相容性较差，这一问题仍然存在。本研究通过使用（3-氨丙基）三甲氧基硅烷（APTMS）作为桥联剂，通过氢键和化学反应在亲水性PVA薄膜和疏水性SA涂层之间建立连接，解决了上述问题。首先，扫描电子显微镜（SEM）和能谱分析（EDS）证实了SA涂层与PVA薄膜之间的界面相容性得到增强。随后，核磁共振氢谱（H NMR）、傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）实验结果证明了APTMS、SA和PVA薄膜之间存在氢键和化学反应。有趣的是，PVA-APTMS-SA薄膜的接触角为120.77°，吸水率为7.81%，水蒸气透过率为8.69 g/m/h。此外，这种复合薄膜表现出优异的粘附性能，在玻璃和大理石表面测试时，分别需要9.86±0.91和6.17±0.75 MPa的剥离应力。总之，PVA-APTMS-SA薄膜在延长鲜切苹果的保鲜期方面具有巨大潜力，使其成为一种有前途的用于食品保鲜的环保包装材料。
