Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
Malaysian Nuclear Agency, Bangi, 43000 Kajang, Selangor, Malaysia.
Carbohydr Polym. 2021 Jan 15;252:117224. doi: 10.1016/j.carbpol.2020.117224. Epub 2020 Oct 14.
Carboxymethyl starch (CMS) was produced from sago starch via carboxymethylation. The CMS with different degree of substitution (DS) ranges from 0.4 to 0.8 were mixed with polyethylene glycol (PEG) of different molecular weight and distilled water and the hydrogel was cured by electron beam irradiation with doses ranging from 25 to 35 kGy. The results revealed that CMS-PEG hydrogels with DS 0.4 give the optimum gel content when radiated at 30 kGy and with PEG 600. Thermogravimetric analysis (TGA) revealed that there are two phases exist in CMS with DS 0.4 in contrast to the three steps decomposition occurs in DS 0.6 and 0.8. It shows that the CMS with DS 0.4 is more thermally stable. Surface morphology revealed crosslinking among the blends when subjected into the radiation dose. The study shows both radiation and PEG addition improved most of the properties of CMS irrespective of the DS value.
羧甲基淀粉（CMS）是通过羧甲基化从西米淀粉中生产的。取代度（DS）从 0.4 到 0.8 的 CMS 与不同分子量的聚乙二醇（PEG）和蒸馏水混合，并通过电子束辐射进行水凝胶固化，辐射剂量范围为 25 至 35 kGy。结果表明，当用 30 kGy 辐射且使用 PEG 600 时，DS 为 0.4 的 CMS-PEG 水凝胶的凝胶含量最佳。热重分析（TGA）表明，DS 为 0.4 的 CMS 中有两个相存在，而 DS 为 0.6 和 0.8 的 CMS 则发生三个分解步骤。这表明 DS 为 0.4 的 CMS 热稳定性更高。表面形貌显示，当辐射剂量施加到混合物中时，会发生交联。该研究表明，无论 DS 值如何，辐射和 PEG 添加都改善了 CMS 的大部分性能。
