Facile and Efficient Modification of Polystyrene-block-poly(methyl methacrylate) for Achieving Sub-10 nm Feature Size
Facile and Efficient Modification of Polystyrene-block-poly(methyl methacrylate) for Achieving Sub-10 nm Feature Size
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DOI：
10.1021/acs.macromol.8b01454
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发表时间：
2018-10
期刊：
影响因子：
5.5
通讯作者：
Kohei Yoshida;Lin Tian;K. Miyagi;A. Yamazaki;H. Mamiya;Takuya Yamamoto;K. Tajima;Takuya Isono;T. Satoh
中科院分区：
文献类型：
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作者：
Kohei Yoshida;Lin Tian;K. Miyagi;A. Yamazaki;H. Mamiya;Takuya Yamamoto;K. Tajima;Takuya Isono;T. Satoh
基于嵌段共聚物自组装的纳米加工是制备特征尺寸小于10 nm的纳米材料的最有前途的方法之一。尽管聚苯乙烯-嵌段-聚甲基丙烯酸甲酯(PS-b-PMMA)作为一种适合纳米制备的模板已被广泛研究，但PS与PMMA嵌段之间的不相容性使得难以实现相间距小于20 nm的微相分离。现在，我们提出了一种简单有效的PS-b-PMMA后聚改性方法，有效地增加了两嵌段之间的不相容，从而即使在低聚合度的情况下也可以实现微相分离。通过PS-b-PMMA与伯胺和仲胺的酯-酰胺交换反应，在PMMA嵌段中引入少量甲基丙烯酰胺以增加其亲水性。对块体样品的小角X射线散射测量结果表明，改性后的PS-b-PMMA具有较好的力学性能。
Nanofabrication based on block copolymer self-assembly is one of the most promising methods for producing nanopatterns with a sub-10 nm feature size. Although polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) has been widely studied as a suitable template for nanofabrication, the insufficient incompatibility between the PS and PMMA blocks makes it difficult to achieve a microphase separation with the domain spacing of less than ca. 20 nm. We now present a simple and efficient method for the postpolymerization modification of PS-b-PMMA for effectively increasing the incompatibility between the two blocks, so that microphase separation can be achieved even at a low degree of polymerization. The ester–amide exchange reactions of PS-b-PMMA with primary and secondary amines were performed to introduce a small number of methacrylamides into the PMMA block to increase its hydrophilicity. The results of small-angle X-ray scattering measurements performed on bulk samples showed that the modified PS-b-PMMA se...