Facile synthesis of thick films of poly(methyl methacrylate), poly(styrene), and poly(vinyl pyridine) from Au surfaces.
Facile synthesis of thick films of poly(methyl methacrylate), poly(styrene), and poly(vinyl pyridine) from Au surfaces.
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DOI：
10.1021/am200560g
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发表时间：
2011-08
影响因子：
9.5
通讯作者：
Baker, Gregory L.
中科院分区：
文献类型：
--
作者：
Saha, Sampa;Bruening, Merlin L.;Baker, Gregory L.
原子转移自由基聚合（ATRP）通常用于从Au表面生长聚合物刷，但所得到的薄膜厚度通常明显小于从SiO2衬底制备的ATRP。在Au表面上，聚甲基丙烯酸甲酯（PMMA）块体在聚丙烯酸叔丁酯刷上的生长速度比在引发剂单层上的生长速度快，这表明来自Au和SiO2的生长速度差异源于Au表面。由Au的电子转移引起的自由基猝灭可能不是终止机制，因为由薄的交联引发剂聚合得到的膜厚度与在相同聚合条件下由SiO2生成的膜厚度基本相同。然而，这一结果与非交联膜中硫醇的解吸以及这些硫醇与生长的聚合物链的反应相一致。交联引发剂的稳定性增强，可以在高达~100°C的温度下进行ATRP，并且可以在1小时内从Au表面生长PMMA (350 nm)，聚苯乙烯（120 nm）和聚（乙烯基吡啶）（200 nm）的厚膜。在温度为100°C时，聚合物刷层分层成大面积薄膜。
Atom transfer radical polymerization (ATRP) is commonly used to grow polymer brushes from Au surfaces, but the resulting film thicknesses are usually significantly less than with ATRP from SiO2 substrates. On Au, growth of poly(methyl methacrylate) (PMMA) blocks from poly(tert-butyl acrylate) brushes occurs more rapidly than growth of PMMA from initiator monolayers, suggesting that the disparity between growth rates from Au and SiO2 stems from the Au surface. Radical quenching by electron transfer from Au is probably not the termination mechanism because polymerization from thin, cross-linked initiators gives film thicknesses that are essentially the same as the thicknesses of films grown from SiO2 under the same polymerization conditions. However, this result is consistent with termination through desorption of thiols from non-cross-linked films, and reaction of these thiols with growing polymer chains. The enhanced stability of cross-linked initiators allows ATRP at temperatures up to ~100 °C and enables the growth of thick films of PMMA (350 nm), polystyrene (120 nm) and poly(vinyl pyridine) (200 nm) from Au surfaces in 1 hour. At temperatures >100 °C, the polymer brush layers delaminate as large area films.
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影响因子：
15
作者：
Mulvihill, MJ;Rupert, BL;Yang, PD
通讯作者：
Yang, PD
影响因子：
3.9
作者：
Biesalski, M;Rühe, J
通讯作者：
Rühe, J
DOI：
10.1016/s0021-9673(00)96149-1
发表时间：
1984-01-01
期刊：
JOURNAL OF CHROMATOGRAPHY
影响因子：
--
作者：
SANDER, LC;WISE, SA
通讯作者：
WISE, SA
影响因子：
15
作者：
Prucker, O;Naumann, CA;Frank, CW
通讯作者：
Frank, CW
影响因子：
56.9
作者：
MILNER, ST
通讯作者：
MILNER, ST