Cationic waterborne polyurethane–chitosan based on natural rubber as new green antimicrobial coating

多元醇 材料科学 天然橡胶 聚氨酯 壳聚糖 异戊二烯 化学结构 接触角 阳离子聚合 化学工程 涂层 高分子化学 核化学 有机化学 复合材料 聚合物 化学 工程类 共聚物
作者
Nathapong Sukhawipat,Anutida Suwan,Ekwipoo Kalkornsurapranee,Anuwat Saetung,Nitinart Saetung
出处
期刊:Progress in Organic Coatings [Elsevier BV]
卷期号:161: 106497-106497 被引量:15
标识
DOI:10.1016/j.porgcoat.2021.106497
摘要

This is the first report on developing new methodologies to synthesize hydroxytelechelic natural rubber (HTNR), a bio-polyol based on natural rubber (NR), by mechanical and chemical degradation. The mechanical degradation of NR from shear during mastication leads to a lower molecular weight before oxidative cleavage by periodic acid. The effects of the molar ratio of periodic acid/isoprene unit ([H5IO6]/[isoprene unit]) on properties of HTNR were investigated. The end-functionality was determined by 1H NMR spectroscopy and the molecular weight was determined by SEC. The HTNR polyol with 3000 g/mol molecular weight and H5IO6 at 0.07 ratio were used as precursors to synthesize cationic waterborne polyurethane (cWPU). The cWPU had a well-defined size distribution and was stable for at least 3 months. The chemical structure of cWPU was confirmed by 1H NMR spectroscopy. Moreover, the hydrophilic properties and antimicrobial properties of cWPU improved when mixed with 1% solution of protonated chitosan (PCS). In addition, the effects of PCS content were studied. The investigations showed that increasing PCS gave a more hydrophilic surface with a low contact angle and a high surface free energy for the cWPU-PCS film. Furthermore, PCS at over 3%wt content inhibited E. coli growth. Hence, the new cWPU mixed with chitosan could serve as an alternative antimicrobial coating material.
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