Influence of drying time of polyelectrolyte multilayers on the compression-induced pattern formation.
Influence of drying time of polyelectrolyte multilayers on the compression-induced pattern formation.
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DOI：
10.1021/la802957r
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发表时间：
2008-11
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影响因子：
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通讯作者：
Xiao Gong;Jiegeng Yang;Lulu Han;Changyou Gao
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文献类型：
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作者：
Xiao Gong;Jiegeng Yang;Lulu Han;Changyou Gao
当聚电解质多层膜在小压力下被聚二甲基硅氧烷（PDMS）压印时，已经发现了压缩（Macromolecules 2004, 37, 8836）。在这项工作中，我们进一步发现含有多层膜的聚二烯基二甲基氯化铵（PDADMAC）的图案形成取决于多层膜在压缩前的干燥时间。聚4-苯乙烯磺酸-共马来酸钠盐(PSSMA)/PDADMAC多层膜在70%的相对湿度和室温下干燥2、6和12 h后，用线性图案的PDMS压痕压缩多层膜，得到双条、高脊和线性图案。这些现象与层数和盐浓度无关，可以应用于其他含PDADMAC的多层体系，如聚苯乙烯磺酸钠盐(PSS)/PDADMAC和聚丙烯酸钠盐(PAA)/PDADMAC。提出了一个描述该过程的模型，并讨论了含水率对多层膜结构和性能的影响。稳定性实验表明，在较短的干燥时间内获得的条状和高脊状可以在水中孵育5h后消除，而压缩形成的图案非常稳定。
Compression of the polyelectrolyte multilayers has been found previously when they were pressed by a poly(dimethylsiloxane) (PDMS) stamp under a small pressure (Macromolecules 2004, 37, 8836). In this work, we further found that the pattern formation of the poly(diallyldimethylammonium chloride) (PDADMAC) containing multilayers is dependent on the drying time of the multilayers prior to compression. After the poly(4-styrenesulfonic acid-co-maleic acid) sodium salt (PSSMA)/PDADMAC multilayers were dried at 70% relative humidity and room temperature for 2, 6, and 12 h, compression of the multilayers by a PDMS stamp with linear patterns obtained double strips, high ridges and linear patterns on the multilayers, respectively. These phenomena were independent of the layer number and salt concentration and could be applied to other PDADMAC containing multilayer systems such as poly(styrene sulfonate) sodium salt (PSS)/PDADMAC and poly(acrylic acid, sodium salt) (PAA)/PDADMAC. A model was suggested to depict the process, and the influence of the water content on the multilayer structure and properties was discussed. The stability experiments revealed that the strips and high ridges obtained at shorter drying time could be erased by incubation in water for 5 h, while the compression created patterns were very stable.