Oh Yena, Park Kitae, Ansari Jamilur R, Seo Jongchul
Department of Packaging and Logistics, Yonsei University, 1 Yonseidae-gil, Wonju-si 26493, Republic of Korea.
Polymers (Basel). 2024 Sep 4;16(17):2513. doi: 10.3390/polym16172513.
Polyvinyl alcohol (PVA) is a popular material used in the packaging industry. However, it is vulnerable to moisture, which can affect its performance and durability. Introducing hydrophobic substances, such as tetraethyl orthosilicate (TEOS) and hexadecyltrimethoxysilane (HDTMS), on the top layer of PVA can help maintain the excellent properties of PVA under high-humidity conditions. The low compatibility of hydrophobic materials with the hydrophilic layers allows them to aggregate more easily. To overcome these issues, we focused on the effects of particle size when increasing the coating suspension's dispersibility. A carbon quantum dot (CQD) suspension is an appropriate novel solvent for hydrophobic TEOS/HDTMS coating suspensions because its particles are small and light and exhibit good dispersibility. The CQD suspension formed a smooth hydrophobic coating on the TEOS/HDTMS materials. Furthermore, the uniformly coated PVA with the CQD suspension exhibited a water contact angle of 110°. The water droplets remained intact without being absorbed, confirming the effectiveness of the surface coating facilitated by CQDs. These results suggested that CQDs improved the dispersibility and enhanced the coating quality of TEOS/HDTMS on PVA. Enhancing the hydrophobicity of PVA is ideal for applications in packaging and other fields.
聚乙烯醇（PVA）是包装行业中常用的一种材料。然而，它易受潮，这会影响其性能和耐用性。在PVA顶层引入疏水性物质，如正硅酸四乙酯（TEOS）和十六烷基三甲氧基硅烷（HDTMS），有助于在高湿度条件下保持PVA的优异性能。疏水性材料与亲水性层的低相容性使其更容易聚集。为克服这些问题，我们在提高涂层悬浮液分散性时关注了粒径的影响。碳量子点（CQD）悬浮液是疏水性TEOS/HDTMS涂层悬浮液合适的新型溶剂，因为其颗粒小且轻，具有良好的分散性。CQD悬浮液在TEOS/HDTMS材料上形成了光滑的疏水涂层。此外，用CQD悬浮液均匀涂覆的PVA的水接触角为110°。水滴保持完整未被吸收，证实了CQD促进的表面涂层的有效性。这些结果表明，CQD提高了TEOS/HDTMS在PVA上的分散性并提高了涂层质量。提高PVA的疏水性对于包装和其他领域的应用是理想的。
