Fabrication of a Polymer Molecularly Flat Substrate by Thermal Nanoimprinting and AFM Observation of Polymer Chains Deposited on It
Fabrication of a Polymer Molecularly Flat Substrate by Thermal Nanoimprinting and AFM Observation of Polymer Chains Deposited on It
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DOI：
10.1021/acs.macromol.9b01280
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发表时间：
2019-08
期刊：
影响因子：
5.5
通讯作者：
Ryota Umetsu;J. Kumaki
中科院分区：
文献类型：
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作者：
Ryota Umetsu;J. Kumaki
聚合物表面具有较高的迁移率，其玻璃化转变温度较体值显著降低。在这项研究中，我们通过热纳米压印在原子阶梯蓝宝石衬底上的PMMA板上制备了分子扁平的聚甲基丙烯酸甲酯（PMMA）衬底。印迹PMMA表面台阶高度约为0.2 nm，在室温空气中稳定数月，即使在水中浸泡10小时也能保持稳定。原子力显微镜在分子水平上观察到通过Langmuir-Blodgett技术沉积在印迹PMMA衬底上的PMMA链和等规PMMA晶体单层，分子结构在室温空气中稳定数月。印迹PMMA衬底和沉积的单层表面的这些显著稳定性是意想不到的，并且与基于我们目前对聚合物表面的理解所期望的结果不同。结果表明，…
The surface of polymers is believed to have high mobility, and their glass transition temperature decreases significantly from the bulk value. In this study, we prepared a molecularly flat poly(methyl methacrylate) (PMMA) substrate by thermal nanoimprinting a PMMA plate with an atomically stepped sapphire substrate. The imprinted PMMA surface with a step height of ca. 0.2 nm was stable for months in air at room temperature and was retained even after immersion in water for 10 h. PMMA chains and an isotactic PMMA crystalline monolayer deposited on the imprinted PMMA substrate by the Langmuir–Blodgett technique were observed by atomic force microscopy at the molecular level, and the molecular structures were stable for months in air at room temperature. These significant stabilities of the surface of the imprinted PMMA substrate and the monolayers deposited are unexpected and differ from the results expected based on our present understanding of the polymer surfaces. The results indicate that the properties...