摘要
以甲基丙烯酰胺(MAAm)和N,N-二甲基丙烯酰胺(DMAA)为单体、N,N-亚甲基双丙烯酰胺(BIS)为交联剂、2,2-二乙氧基苯乙酮(I-2959)为引发剂,通过自由基聚合和浸泡法制备了聚甲基丙烯酰胺/聚(N,N-二甲基丙烯酰胺)(PMAAm/PDMAA)双网络上临界溶液温度(UCST)型水凝胶,将其用于调剖堵水。采用SEM、FTIR、高温流变仪对水凝胶的形貌、氢键作用和温度响应性进行了表征,探究了其温度响应下的溶胀性能以及氢键供体(胺基)和氢键受体(羰基)比例对水凝胶的力学性能的影响。结果表明,当n(MAAm)∶n(DMAA)=2∶1时,制备的双网络UCST型水凝胶(PMAAm/PDMAA-2.0)具有较高的转变温度(90℃),拉伸强度最大可达13.8 MPa,拉伸断裂伸长率为100.9%,压缩应变在80%时的压缩强度最大可达4.0 MPa。PMAAm/PDMAA-2.0的UCST响应能力主要来源于聚合物链之间氢键的缔合与解离,其能够在低温下抗溶胀,高温下吸水膨胀倍数可达40倍,并且拥有0.65 MPa的突破压力。
A dual network upper critical solution temperature(UCST)-type hydrogel poly(methyl methacrylamide)/poly(N,N-dimethylacrylamide)(PMAAm/PDMAA)was prepared via free radical polymerization and soaking method using methyl methacrylamide(MAAm)and N,N-dimethylacrylamide(DMAA)as monomers,N,N-methylene bisacrylamide(BIS)as crosslinking agent and 2,2-diethoxyacetophenone(I-2959)as initiator,for application in profile control and water plugging.The morphology,hydrogen bonding interactions,and temperature-responsive properties of the hydrogel were analyzed by SEM,FTIR and high temperature rheometer.The swelling behavior in response to temperature and the influence of the ratio of hydrogen bond donors(amine groups)to hydrogen bond acceptors(carbonyl groups)on the mechanical properties of hydrogel were explored.The results showed that when the molar ratio of MAAm to DMAA was 2∶1,the prepared dual network UCST-type hydrogel(PMAAm/PDMAA-2.0)exhibited a high transition temperature(90℃),a tensile strength of up to 13.8 MPa,a tensile strain at break of 100.9%,and a compressive strength of 4.0 MPa at 80%compressive strain.The UCST response of PMAAm/PDMAA-2.0 was primarily attributed to the association and dissociation of hydrogen bonds between polymer chains,which led to swelling resistance at low temperatures and significant water absorption and expansion(up to 40 times its original size)at high temperatures,with a breakthrough pressure of 0.65 MPa.
作者
王犁
曾燚
黄晶
钱洪芳
周利华
武元鹏
WANG Li;ZENG Yi;HUANG Jing;QIAN Hongfang;ZHOU Lihua;WU Yuanpeng(School of New Energy and Materials,Southwestern Petroleum University,Chengdu 610500,Sichuan,China;Engineering Technology Research Institute,Petro China Southwest Oil&Gas Field Company,Chengdu 610500,Sichuan,China;Sichuan Shangzhideng New Material Technology Co.,Ltd.,Deyang 618300,Sichuan,China)
出处
《精细化工》
北大核心
2025年第8期1849-1856,共8页
Fine Chemicals
基金
国家自然科学基金面上项目(52173301)
四川省科技计划资助项目(2023YFG0105)
油气藏地质及开发工程国家重点实验室(西南石油大学)开放基金项目(PLN2022-48)。
关键词
上临界溶液温度
深部调剖
缓膨颗粒
氢键缠结
双网络凝胶
油田化学品
upper critical solution temperature
deep profile control
slow-swelling particles
hydrogen bonding entanglement
double network gels
oil field chemicals
