聚甲基丙烯酸甲酯在纳米氧化铝表面的吸附和氢键作用  

Adsorption of Poly(methyl methacrylate) on Nano-alumina and Bound Carbonyls

作　　者：陈艺章[1] 张锦琳[1] 贾明印[1] 于建[1] 郭朝霞[1] 

机构地区：[1]清华大学化工系先进材料教育部重点实验室,北京100084

出　　处：《高等学校化学学报》2010年第10期2093-2097,共5页Chemical Journal of Chinese Universities

摘　　要：研究了聚甲基丙烯酸甲酯(PMMA)在纳米氧化铝表面的吸附行为,采用透射红外光谱研究了吸附的PMMA中的羰基和纳米氧化铝表面羟基之间的氢键作用.结果表明,PMMA在纳米氧化铝表面的吸附曲线为典型的Langmuir曲线,饱和吸附值为1.2mg/m2,受氢键作用影响,键合羰基在红外光谱中的吸收峰向低波数方向移动.根据计算,羰基的最大键合值(即含键合羰基的甲基丙烯酸甲酯单元的总质量)为0.36mg/m2,其余为自由羰基.随着吸附量的增加,羰基的键合比例逐渐降低.吸附达到饱和时,羰基键合比例为0.30,说明PMMA主要以平铺的方式覆盖在纳米氧化铝的表面.The adsorption behavior of poly（methyl methacrylate）（PMMA） on the surface of alumina nanoparticles was studied,the amount of adsorbed PMMA was examined with thermal gravimetric analysis（TGA） and the fraction of bound carbonyls of adsorbed PMMA was determined using transmission Fourier transform infrared spectroscopy（FTIR）.The adsorption curve has the form of Langmuir＇s isotherms.The carbonyl-stretching band of bound carbonyls shifts to lower wavenumbers because of the hydrogen bonding with aluminol groups.Curve fitting of the carbonyl-stretching region allowed the estimation of both the relative amounts and also the relative ratio of the absorption coefficients for the free and bound carbonyls.The fraction of bound carbonyls is 0.3 at the maximum adsorption,indicating that PMMA adsorbed on nano-alumina is arranged in a flat fashion.

关 键 词：纳米氧化铝 聚甲基丙烯酸甲酯 吸附 键合羰基 

分 类 号：O631[理学—高分子化学]