摘要
研究了羟丙基甲基纤维素(HPMC)相态转变温度影响因素及变化规律,揭示了HPMC溶胶-凝胶相态转变的机理。通过浊点温度、流变性试验,明确了外加剂NaCl、十二烷基硫酸钠(SDS)是HPMC溶胶相变温度的主控影响因素。加入NaCl能显著降低HPMC溶胶相变温度;当SDS加量超过临界胶束浓度时,HPMC溶胶-凝胶相变温度升高。HPMC溶胶相变前后微观结构和宏观现象表明,当其在水中溶胀后呈线性分布,结构间连接较弱;温度升高至相变温度后,水分子从凝胶的“笼状”结构脱离,分子链间产生疏水缔和,凝胶三维网状结构密度增大、强度升高转变为固态。
The influencing factors and changing rules of the phase transition temperature of hydroxypropyl methyl cellulose(HPMC)were studied,and the mechanism of the phase transition of HPMC sol-gel was revealed.Through cloud point temperature and rheological tests,it was determined that the additives NaCl and sodium dodecyl sulfate(SDS)are the main controlling factors for the phase transition temperature of HPMC sol.The addition of NaCl can significantly reduce the phase transition temperature of HPMC sol;when SDS dosage exceeds the critical micelle concentration,the phase transition temperature of HPMC sol-gel increases.The microstructure and macroscopic phenomena before and after the phase transition of HPMC sol indicate that when it swells in water,it exhibits a linear distribution and weak connections between structures;when the temperature rises to the phase transition temperature,the water molecules are separated from the“cage”structure of the gel,hydrophobic bonds are generated between the molecular chains,and the density and strength of the three-dimensional network structure of the gel increase,and the gel turns into a solid state.
作者
王波
林进
马风杰
吴金桥
耿愿
马振锋
张帆
杨先伦
WANG Bo;LIN Jin;MA Fengjie;WU Jinqiao;GENG Yuan;MA Zhenfeng;ZHANG Fan;YANG Xianlun(Natural Gas Research Institute Branch,Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi’an 710075,China;Shaanxi Key Laboratory of Continental Shale Gas Accumulation and Development,Xi’an 710075,China;Chuanqing Drilling&Exploration Engineering Company Limited Changqing Downhole Technical Operation Company,Xi’an 710018,China;CNPC Engineering Technology R&D Company Limited,Beijing 102200,China;College of Petroleum Engineering,Xi’an Shiyou University,Xi’an 710065,China)
出处
《应用化工》
北大核心
2025年第1期23-27,32,共6页
Applied Chemical Industry
基金
国家科技重大专项(2017ZX05039-003)
陕西省创新能力支撑计划(2024ZC-KJXX-129)。
关键词
HPMC
相态转变
浊点温度
凝胶强度
疏水缔合
HPMC
phase transition
cloud point temperature
gel strength
hydrophobic association
