Halligan Elaine, Tie Billy Shu Hieng, Colbert Declan Mary, Alsaadi Mohamad, Zhuo Shuo, Keane Gavin, Geever Luke M
Polymer, Recycling, Industrial, Sustainability and Manufacturing (PRISM) Center, Technological University of the Shannon, Midlands Midwest, Dublin Road, N37 HD68 Athlone, Co. Westmeath, Ireland.
CONFIRM Centre for Smart Manufacturing, University of Limerick, V94 T9PX Limerick, Co. Limerick, Ireland.
Gels. 2023 May 25;9(6):439. doi: 10.3390/gels9060439.
Poly (N-vinylcaprolactam) is a polymer that is biocompatible, water-soluble, thermally sensitive, non-toxic, and nonionic. In this study, the preparation of hydrogels based on Poly (N-vinylcaprolactam) with diethylene glycol diacrylate is presented. The N-Vinylcaprolactam-based hydrogels are synthesised by using a photopolymerisation technique using diethylene glycol diacrylate as a crosslinking agent, and Diphenyl (2, 4, 6-trimethylbenzoyl) phosphine oxide as a photoinitiator. The structure of the polymers is investigated via Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy. The polymers are further characterised using differential scanning calorimetry and swelling analysis. This study is conducted to determine the characteristics of P (N-vinylcaprolactam) with diethylene glycol diacrylate, including the addition of Vinylacetate or N-Vinylpyrrolidone, and to examine the effects on the phase transition. Although various methods of free-radical polymerisation have synthesised the homopolymer, this is the first study to report the synthesis of Poly (N-vinylcaprolactam) with diethylene glycol diacrylate by using free-radical photopolymerisation, using Diphenyl (2, 4, 6-trimethylbenzoyl) phosphine oxide to initiate the reaction. FTIR analysis shows that the NVCL-based copolymers are successfully polymerised through UV photopolymerisation. DSC analysis indicates that increasing the concentration of crosslinker results in a decrease in the glass transition temperature. Swelling analysis displays that the lower the concentration of crosslinker present in the hydrogel, the quicker the hydrogels reach their maximum swelling ratio.
聚（N-乙烯基己内酰胺）是一种具有生物相容性、水溶性、热敏性、无毒且呈非离子性的聚合物。在本研究中，介绍了基于聚（N-乙烯基己内酰胺）与二乙二醇二丙烯酸酯制备水凝胶的方法。以N-乙烯基己内酰胺为基础的水凝胶是通过使用二乙二醇二丙烯酸酯作为交联剂、二苯基（2,4,6-三甲基苯甲酰基）氧化膦作为光引发剂的光聚合技术合成的。通过衰减全反射傅里叶变换红外光谱对聚合物的结构进行了研究。使用差示扫描量热法和溶胀分析对聚合物进行了进一步表征。进行本研究是为了确定聚（N-乙烯基己内酰胺）与二乙二醇二丙烯酸酯的特性，包括添加醋酸乙烯酯或N-乙烯基吡咯烷酮，并研究其对相变的影响。尽管各种自由基聚合方法已合成了均聚物，但本研究首次报道了通过自由基光聚合，使用二苯基（2,4,6-三甲基苯甲酰基）氧化膦引发反应来合成聚（N-乙烯基己内酰胺）与二乙二醇二丙烯酸酯。傅里叶变换红外光谱分析表明，基于N-乙烯基己内酰胺的共聚物通过紫外光聚合成功聚合。差示扫描量热法分析表明，交联剂浓度的增加导致玻璃化转变温度降低。溶胀分析显示，水凝胶中存在的交联剂浓度越低，水凝胶达到其最大溶胀率的速度就越快。
