Le Phat Thinh, Nguyen Khoi Tan
School of Biotechnology, International University - Vietnam National University HCMC, Viet Nam.
School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia.
Heliyon. 2020 Nov 21;6(11):e05559. doi: 10.1016/j.heliyon.2020.e05559. eCollection 2020 Nov.
Biodegradable modified natural polymers have great potential in curbing the threat of plastic pollution, but are still uncompetitive to petrochemical-based plastic. In this study, starch was hydrophobized by treating starch-dimethyl sulfoxide solutions with soybean oil at high temperature in the presence of sodium carbonate, then spray-coated on paper. The modified starch was evaluated by Fourier-transform infrared spectroscopy analysis and contact angle value measurement of coated paper. FTIR analysis confirmed the substitution of hydroxyl groups with fatty acid ester and provided an estimate of the degree of substitution. The contact angle value of starch-coated paper surfaces was 121°, and was 111° after 10 min, demonstrating the high hydrophobicity and potential of the modified starch coating as a water-resistant treatment. The high hydrophobicity of the coated paper was due to formation of a textured surface with two levels of roughness, caused by the deposition of rough hydrophobic starch particles on paper fibers.
可生物降解的改性天然聚合物在抑制塑料污染威胁方面具有巨大潜力，但与石化基塑料相比仍缺乏竞争力。在本研究中，在碳酸钠存在下，通过在高温下用大豆油处理淀粉-二甲基亚砜溶液对淀粉进行疏水化处理，然后喷涂在纸张上。通过傅里叶变换红外光谱分析和涂层纸的接触角值测量对改性淀粉进行了评估。傅里叶变换红外光谱分析证实了羟基被脂肪酸酯取代，并提供了取代度的估计值。淀粉涂层纸表面的接触角值为121°，10分钟后为111°，表明改性淀粉涂层作为防水处理具有高疏水性和潜力。涂层纸的高疏水性是由于在纸纤维上沉积了粗糙的疏水淀粉颗粒，形成了具有两级粗糙度的纹理表面。
