摘要
以改性膨润土、2-丙烯酰胺基-2-甲基丙磺酸、丙烯酰胺和新型温敏大分子单体为主要原料,N,N′-亚甲基双丙烯酰胺为交联剂,采用水溶液互穿网络聚合技术制备了温敏互穿网络水凝胶/改性膨润土复合吸水保水材料。利用X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)、热重分析仪(TG)、扫描电子显微镜(SEM)和差示扫描量热仪(DSC)对样品进行了表征分析。考察了复合吸水保水材料的溶胀性能、温度敏感性能、去溶胀性能、振荡溶胀-去溶胀性能和拉伸性能。结果表明,20℃时复合吸水保水材料DNB5在蒸馏水和0.9%(质量分数)NaCl溶液中的最大溶胀率分别为20.59 g/g和7.92 g/g;随着改性膨润土或第二网络结构中丙烯酰胺(AM)含量的增加,复合吸水保水材料的低临界溶解温度(LCST)、溶胀率和拉伸强度增加,表现出良好的吸水、保水和温敏性;复合吸水保水材料呈现可逆溶胀-去溶胀行为和较好的机械强度。
Thermosensitive interpenetrating double-network hydrogel/modified bentonite composite water absorbent and retention material was synthesized by modified bentonite,2-acrylamido-2-methylpropane sulfonic acid,acrylamide,thermosensive macromonomer raw materials and N,N′-methylenebis(acrylamide)as crosslinker through aqueous solution interpenetrating double-network polymerization method.The prepared samples were characterized by X-ray diffraction(XRD),Fourier transform infrared spectrometer(FTIR),thermal gravimetry(TG),field emission scanning electron microscopy(SEM),and differential scanning calorimetric(DSC).The swelling property,temperature sensitivity,deswelling property,oscillatory swelling/deswelling property and tensile strength of the composite water absorbent and retention material were studied.The results show that the absorbancy of the composite water absorbent DNB5 and retention material to deionized water and 0.9%NaCl solution is about 20.59 g/g and 7.92 g/g respectively at 20℃.The LCST,equilibrium swelling ratio and tensile strength of the composite water absorbent and retention material are enhanced with the increase in dosage of modified bentonite or AM of second-network.It can find that the composite water absorbent and retention material possesses good water absorption,water retention,remarkable thermosensitivity,controllable equilibrium swelling/deswelling behavior and higher mechanical property.
作者
王毓
赵君
任俊鹏
李本秀
周进康
李小平
WANG Yu;ZHAO Jun;REN Junpeng;LI Benxiu;ZHOU Jinkang;LI Xiaoping(School of Chemistry and Materials Science,Guizhou Education University,Guiyang 550018,China;Anshun Engineering Research Centre of Concrete Admixture,Anshun 561100,China;Guizhou Tiejianhengfa New Material Technology Co.Ltd.,Anshun 561100,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第12期12178-12184,共7页
Materials Reports
基金
贵州省自然科学基金(J20181122,J20191252)
国家自然科学基金(21464005)
贵州省教育厅青年科技人才基金(KY2018263)。
关键词
温敏大分子单体
改性膨润土
互穿网络
吸水保水材料
thermosensitive macromonomer
modified bentonite
interpenetrating double-network
water absorbent and retention material
