Effect of the Density of ATRP Thiol Initiators in the Yield and Water Content of Grafted-From PMETAC Brushes. A Study by Means of QCM-D and Spectroscopic Ellipsometry Combined in a Single Device
Effect of the Density of ATRP Thiol Initiators in the Yield and Water Content of Grafted-From PMETAC Brushes. A Study by Means of QCM-D and Spectroscopic Ellipsometry Combined in a Single Device
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DOI：
10.1002/macp.201100501
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发表时间：
2012-03-16
影响因子：
2.5
通讯作者：
Moya, Sergio E.
中科院分区：
文献类型：
--
作者：
Ramos, Jagoba Iturri;Moya, Sergio E.
采用原子转移自由基聚合法，以β-硫醇为引发剂，1-十一硫醇为空白，合成了聚[2-(甲基丙烯酰氧基)乙基]三甲基氯化铵电刷。引发剂浓度随引发剂与空白溶液的摩尔比在100%~1%之间变化。电刷生长由石英晶体耗散微天平(QCM-D)和椭圆偏振光谱仪的单一装置组合而成。同时记录声学质量(Macous)和光学质量(MOPT)。刷子的水合作用是根据Macous和MOPT之间的差值计算出来的。对于每个引发剂密度，定量了在浓度从10-3M到1M的氯化钠溶液中刷子坍塌时失水的百分比。
Poly {[2-(methacryloyloxy)ethyl] trimethylammonium chloride} (PMETAC) brushes are synthesized by atom transfer radical polymerization from mixed monolayers of ?-mercaptoundecyl bromoisobutyrate thiol (initiator) and 1-undecanethiol (blank). Initiator density is varied from 100% to 1% by the molar ratio of initiator to blank in solution. Brush growth is followed in situ by a single device combination of a quartz crystal microbalance with dissipation (QCM-D) and spectroscopic ellipsometry. Acoustic mass (macous) and optical mass (mopt) are simultaneously recorded. Brush hydration is calculated from the difference between macous and mopt. The percentage of water lost during brush collapse in NaCl solution at concentration from 10-3 M to 1 M is quantified for each initiator density.