Lego Béatrice, François Marion, Skene W G, Giasson Suzanne
Department of Chemistry, Université de Montréal, Montréal, Canada.
Langmuir. 2009 May 5;25(9):5313-21. doi: 10.1021/la804060s.
The controlled grafting density of poly(tert-butyl acrylate) was studied on OH-activated mica substrates via surface-initiated atom-transfer radical polymerization (ATRP). By properly adjusting parameters such as the immobilization reaction time and the concentration of an ATRP initiator, a wide range of initiator surface coverages and hence polymer densities on mica were possible. The covalently immobilized initiator successfully promoted the polymerization of tert-butyl acrylate on mica surfaces. The resulting polymer layer thickness was measured by AFM using a step-height method. Linear relationships of the polymer thickness with respect to the molecular weight of the free polymer and with respect to the monomer conversion were observed, suggesting that ATRP is well controlled and relatively densely end-grafted layers were obtained. The polymer grafting density controlled by adjusting the initiator surface coverage was confirmed by the polymer layer swelling capacity and film thickness measurements.
通过表面引发原子转移自由基聚合（ATRP），研究了聚（丙烯酸叔丁酯）在OH活化云母基底上的可控接枝密度。通过适当调整诸如固定化反应时间和ATRP引发剂浓度等参数，可以在云母上实现广泛的引发剂表面覆盖率，进而实现聚合物密度的调控。共价固定的引发剂成功地促进了丙烯酸叔丁酯在云母表面的聚合反应。利用台阶高度法通过原子力显微镜（AFM）测量了所得聚合物层的厚度。观察到聚合物厚度与游离聚合物分子量以及单体转化率之间的线性关系，这表明ATRP反应得到了良好的控制，并且获得了相对致密的端接枝层。通过聚合物层溶胀能力和膜厚度测量，证实了通过调节引发剂表面覆盖率来控制聚合物接枝密度。
