Controlling Volume Shrinkage in Soft Lithography through Heat-Induced Cross-Linking of Patterned Nanofibers
Controlling Volume Shrinkage in Soft Lithography through Heat-Induced Cross-Linking of Patterned Nanofibers
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通过图案化纳米纤维的热诱导交联控制软光刻中的体积收缩
DOI：
10.1021/ja110901h
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Takuzo Aida
中科院分区：
文献类型：
--
作者：
Yasunao Miyamura;Chiyoung Park;Kazushi Kinbara;Frank A.Leibfarth;Craig J.Hawker;Takuzo Aida
当富含三-二芳基序列的聚二烯丙基丙二酸亚异丙酯(STRICH-2)作为可交联墨用于微接触印刷时，通过消除CO2和丙酮的热诱导交联，所得到的700 nm和300 nm宽条纹的亚微米级图案被成功地溶解，同时保持了其高尺寸完整性。与之形成鲜明对比的是，尽管富含三异构体序列的聚合物(ITRICH-2)和立构规整度较低的聚合物(2low)的热性能和反应活性与Strich-2几乎不同，但用这些参考聚合物打印的图案在加热时由于体积收缩效应而显著坍塌。Strich-2和其他两种聚合物之间的显著差异很可能来自Strich-2的纳米纤维形成特性，其中打印的条纹是多孔的，受单个纳米纤维体积收缩的影响要小得多。
When poly(isopropylidene diallylmalonate) rich inthreo-disyndiotactic sequences (strich-2) was utilized as a cross-linkable ink for microcontact printing, the resultant submicrometer-scale patterns featuring 700 and 300 nm wide stripes were successfully insolubilized while maintaining their high dimensional integrity by heat-induced cross-linking with elimination of CO2and acetone. In sharp contrast, although the thermal properties and reactivities of a polymer rich inthreo-diisotactic sequences (itrich-2) and a polymer having low stereoregularity (2low) are little different from those ofstrich-2, the patterns printed with these reference polymers collapsed considerably upon heating as a result of a volume shrinkage effect. The striking difference betweenstrich-2and the other two polymers most likely arises from the nanofiber-forming character ofstrich-2, where the printed stripes are porous and much less affected by the volume shrinkage of individual nanofibers.