| 秦欢,谭陆西.化学通报,2026,89(6):709-716. |
| 高温温敏热可逆型PDMAA-n型水凝胶 |
| High-Temperature Thermally Sensitive Reversible PDMAA-n Hydrogel |
| 投稿时间：2026-03-06 修订日期：2026-04-03 |
| DOI： |
| 中文关键词: 热可逆凝胶 高温稳定性 低临界溶解温度(LCST) N,N-二甲基丙烯酰胺(DMAA) 2-丙烯酰胺基-2-甲基丙磺酸(AMPS) |
| 英文关键词:Thermoreversible gel High-temperature stability Lower critical solution temperature (LCST) N,N-dimethylacrylamide (DMAA) 2-acrylamido-2-methylpropanesulfonic acid (AMPS) |
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| 中文摘要: |
| 针对高温工业对高性能温敏热可逆凝胶需求,本研究在酸性条件下通过对N,N-二甲基丙烯酰胺(DMAA)与2-丙烯酰胺基?2?甲基丙磺酸(AMPS)进行自由基共聚,成功制备出一种具有良好热稳定性和温敏可逆的三维网络凝胶体系,该体系在130℃下可稳定存在7天以上,未发生破胶溶解现象。调节DMAA、AMPS在主剂中的质量占比,可同时提升LCST以及损耗因子,提高损耗因子可进一步提升材料韧性,提升工业应用价值。傅里叶变换红外光谱(FT?IR)与凝胶渗透色谱(GPC)表明,成功合成了二元共聚物,进一步通过扫描电子显微镜(SEM)对比高低温下的形貌发现,高温条件下凝胶呈多孔网络结构,而低温时则表现为片层状结构,这一差异与体系的温敏可逆性相一致。所制备的高温热可逆凝胶在高温密封、工业防护及油田暂堵等场景中具有重要的应用潜力与推广价值。 |
| 英文摘要: |
| To meet the demands of high-temperature industries for high-performance thermally reversible gels, this study constructs a three-dimensional networked gel system with both thermal stability and temperature-sensitive reversibility through free radical copolymerization of N,N-dimethylacrylamide (DMAA) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) under acidic conditions. Experimental results show that different monomer mass ratios significantly influence gel formation time and lower critical solution temperature (LCST). When DMAA accounts for 75%, the prepared PDMAA?1 gel exhibits an LCST of approximately 120?°C and maintains structural integrity for over 7 days at 130?°C without gel fracture, demonstrating excellent high-temperature water retention capacity and structural stability. Fourier transform infrared spectroscopy (FT?IR) and gel permeation chromatography (GPC) characterizations confirm the successful formation of the AMPS?DMAA binary copolymer. Further scanning electron microscopy (SEM) comparisons of gel morphologies at high and low temperatures reveal that the gel presents a porous network structure under high-temperature conditions, while it exhibits a sheet/layer-like structure at low temperatures. This morphological difference aligns with the temperature-sensitive reversibility of the system. In summary, the prepared high-temperature thermally reversible gel holds significant application potential and promotional value in scenarios such as high?temperature sealing, industrial protection, and temporary plugging in oilfields. |
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