聚甲基丙烯酸羟乙酯/乙二醛交联体系的溶液-凝胶-溶液转变  

Solution-gel-solution transition of polyhydroxyethyl methacrylate/glyoxal crosslinking system

作　　者：唐绪涛 穆蒙 卢国强 张永民 TANG Xutao;MU Meng;LU Guoqiang;ZHANG Yongmin(School of Chemical and Material Engineering,Jiangnan University,Wuxi 214122,Jiangsu,China;Postdoctoral Scientific Research Working Station,Shengli Oilfield Branch Company,SINOPEC,Dongying 257100,Shandong,China;Research Institute of Petroleum Engineering Technology,Shengli Oilfield Branch Company,SINOPEC,Dongying 257100,Shandong,China)

机构地区：[1]江南大学化学与材料工程学院,江苏无锡214122 [2]中石化胜利油田博士后工作站,山东东营257100 [3]中石化胜利油田石油工程技术研究院,山东东营257100

出　　处：《精细化工》2023年第10期2200-2206,共7页Fine Chemicals

基　　金：国家自然科学基金(22072058,21503094);中国石化股份公司胜利油田分公司博士后课题“砂岩油藏作业过程中自适应暂堵体系研究”(YKB2109);中国石化股份公司胜利油田分公司创新项目“中低渗油藏广谱自降解暂堵剂”(YKF2306)。

摘　　要：聚合物凝胶的溶液-凝胶-溶液(sol-gel-sol)转变通常依赖于外界条件(温度、pH等)的变化,但构建可在恒定条件下实现sol-gel-sol转变的凝胶体系依然是一个挑战。采用聚甲基丙烯酸羟乙酯(PHEMA)、乙二醛(GX)和N,N-二甲基甲酰胺(DMF)成功构建了一种恒温自发随时间进行sol-gel-sol转变的聚合物凝胶体系(HGX)。考察了GX质量分数、温度和水质量分数对HGX的成胶时间、凝胶强度及降解时间的影响。结果表明,通过改变GX质量分数和温度,HGX可形成弹性模量达847 Pa的凝胶,且最快可在1.5 h后降解为低黏液体(黏度<30 mPa·s)。FTIR光谱和GPC揭示了sol-gel-sol转变的内在机理是缩醛反应和酯基断键的动态竞争。Responsive polymer gels,which can undergo solution-gel-solution(sol-gel-sol)transition by responding to external conditions(such as temperature and pH),have attracted significant attention.However,implementing the sol-gel-sol transition under constant temperature is still a major challenge.A novel polymer gel(HGX),with spontaneous sol-gel-sol transition at fixed temperature over time,was successfully constructed from poly(2-hydroxyethyl methacrylate)(PHEMA),glyoxal(GX)and N,N-dimethylformamide(DMF).The effects of GX mass fraction,temperature and water mass fraction on gelation time,gelation strength and degradation time of HGX were investigated.The results showed that by changing the GX mass fraction and temperature,HGX could form a gel with an elastic modulus of 847 Pa,and degrade to a low viscous liquid(viscosity<30 mPa·s)after 1.5 h.Data from FTIR spectrum and GPC revealed that the intrinsic mechanism of sol-gel-sol transition was attributed to the dynamic competition between acetal reaction and ester group bond breaking.

关 键 词：聚甲基丙烯酸羟乙酯 乙二醛 缩醛反应 酯基 溶液-凝胶-溶液转变 功能材料 

分 类 号：TQ427.26[化学工程]