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Making Multilayer Polymeric Microstructure with Microcontact Printing
Jin Bangkun*, He Pingsheng
Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026
Abstract:
Microstructures of various polymers, such as polystyrene and polymethyl methacrylate, were fabricated with microcontact printing, directly using the corresponding dilute polymeric solutions as “inks”, whose concentrations were about 10 g/L. By repeatedly cross-stamping with the inks, multilayer quasi-three-dimensional polymeric microstructures could be obtained. Both optical photographs and SEM photos showed clear microstructures, which were nearly accurate replication of the original patterns in the PDMS stamps. Microlines of poly-[bis-(p-toluene sulfonate)-2,4-hexadiyne-1,6-diol)] (PTS) were also fabricated by first processed microcontact printing with solution of the corresponding monomer TS/acetone as ink, then followed with UV polymerization of the monomer micropatterns at solid state. Unlike small molecule processes, the molecules of polymeric inks did not self assembly on the surface of substrates. The formation of polymeric microstructures could be ascribed to the fact that, after volatilization of solvents, polymers tend to stick to the surface of glass substrate which has higher surface free energy (about 72 mN/m), but not to the surface of PDMS stamp which has lower surface free energy (about 20 mN/m). Also the microcontact printing process was studied with optical microscopy, and the main factor--volatilization time of solvent was discussed. The results showed that the volatilization time of solvent is very crucial to the process of polymeric microcontact printing, and with too longer or too shorter volatilization time, the obtained microstructures would become discontinuous or distorted, respectively. For example, with a polystyrene/chloroform solution as ink, the optimal volatilization time was about 15~20 s.
Key words:  Soft lithography, Poly(dimethylsiloxane), Polystyrene, Polymethyl methacrylate, Bis-(p-toluene-sulfonate)-2,4-hexadiyne-1,6-diol
FundProject:
微接触印刷法制造聚合物多层次准三维立体微结构
金邦坤*, 何平笙
中国科学技术大学高分子科学与工程系,合肥,230026
摘要:
直接用聚合物稀溶液作为"印墨"进行微接触印刷,制作了诸如聚苯乙烯和聚甲基丙烯酸甲酯等聚合物的微细结构,通过重复交叉盖印得到多层次准三维立体微结构,并用可聚合的双(甲苯磺酸)-2,4-己二炔-1,6-二醇脂的丙酮稀溶液作微接触印刷,观察了微条纹上的聚合.对聚合物溶液的微接触印刷的过程中溶剂挥发等因素的影响进行了观察分析,结果表明,溶剂挥发时间对微图形的准确复制是十分重要的,过长或过短的溶剂挥发时间都不利于得到清晰精确的微结构.
关键词:  软刻蚀  聚二甲基硅氧烷  聚苯乙烯  聚甲基丙烯酸甲酯  双(甲苯磺酸)-2,4-己二炔-1,6-二醇脂
DOI:10.1088/1674-0068/18/3/439-443
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