中文摘要：

利用表面活性剂间的疏水作用以及表面活性剂与单体间的氢键作用,促使甲基丙烯酸（MAA）单体在原位生成的聚甲基丙烯酸甲酯（PMMA）种子乳胶表面的选择性聚合,实现了PMAA纳米水凝胶的水相＂绿色＂制备。利用动态光散射、傅里叶红外光谱、透射电子显微镜表征了PMAA纳米水凝胶的尺寸、组成、形貌和pH响应性。研究了聚氧乙烯失水山梨醇单月桂酸酯（吐温20）的用量、N,N’-亚甲基双丙烯酰胺（MBA）的用量、MAA的用量和加入方式、十二烷基硫酸钠（SDS）的补加速率等对PMAA纳米水凝胶的尺寸和溶胀性能的影响。结果表明：PMAA纳米水凝胶为核-壳结构;随着MBA用量的减小、吐温20用量的增加、MAA用量的增加,PMAA纳米水凝胶的尺寸和溶胀比均增大;当采用半连续加入MAA时,PMAA纳米水凝胶的尺寸和溶胀比变小;当SDS的补加时间由60min延长到100min时,PMAA纳米水凝胶的尺寸逐渐变小。PMAA纳米水凝胶具有良好的pH响应性,当介质的pH从1增加到6时,其流体力学体积扩张了64倍。

英文摘要：

Driven by the hydrophobic interactions between two surfactants and the hydrogen bonding interactions between the surfactant and monomers,methacrylic acid（MAA）monomers are selectively polymerized on the surface of poly（methyl methacrylate）（PMMA）nanolatex seed formed in-situ,thus realizing the ＂green＂synthesis of PMAA nano-hydrogels in water.Dynamic light scattering,Fourier transform infrared spectroscopy and transmission electron microscopy were used to characterize the size and size distribution,composition,morphology,and pH-response behavior of the resulting nano-hydrogels.The influences of the amount of Tween 20,N,N＇-methylene bisacrylamide（MBA）and MAA,the feeding mode of MAA,and the supplement rate of sodium dodecyl sulfate（SDS）on the size and swelling properties of the nano-hydrogels were studied.Results show that the nano-hydrogels have core-shell structure.As the amount of MBA decreases,the amount of Tween 20 increases,or the amount of MAA increases,the size and swelling ratio of the nano-hydrogels both increase.The size and swelling ratio both decrease when MAA is fed semi-continuously.The size decreases slowly as the supplement of SDS is extended from 60 min to 100 min.The PMAA nano-hydrogels display excellent pH-response.When the pH value increases from 1to 6,their hydrodynamic volumes expand for 64 times.