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软刻蚀技术在高分子科学中的应用
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摘要
基于自身结构和性能上的天然优势,高聚物是理想的纳米建筑性基材,高聚物的微结构已经在化学、生物、信息、物理等领域得到了应用。作为一种新兴的微制造技术,软刻蚀技术不仅能够简捷有效、高精度地制备出众多材料的微结构,而且技术成本低廉,它不需要昂贵的设备和苛刻的环境,具有极好的应用前景。本论文把软刻蚀技术结合到高分子科学中来,笔者通过软刻蚀技术制备了具有科研价值和应用价值的高聚物微结构,研究成果具体包括以下几个部分:
     1.溶胀弹性印章的毛细微模塑
     聚二甲基硅氧烷(PDMS)材料在某些极性有机溶剂中易变形的特性常使制备的微结构失真,这本是软刻蚀技术的一大缺陷,笔者则变废为宝,用经过丙酮溶胀后的PDMS弹性印章进行毛细微模塑(MIMIC)操作,制备了图案可控的聚苯乙烯(PS)微结构,我们将这项新的MIMIC技术称之为“溶胀弹性印章的毛细微模塑(MIMICSES)”。在MIMICSES技术中,高聚物微结构的图案可以通过改变高聚物溶液量和外加的压力来控制;MIMICSES是对软刻蚀技术的一种发展,它拓宽了软刻蚀技术适用材料的范围,借用溶胀的PDMS弹性印章,一些必须用极性有机试剂溶解的高聚物也可以通过MIMICSES技术来微结构化。
     2.微热模塑法制备高聚物球面微透镜阵列
     微透镜和微透镜阵列具有重要的光学性能,广泛用于很多领域。利用材料在液态或熔融态时其表面自由能会不断地减小直至最低从而达到最稳定的状态这一特性,用软刻蚀技术中的微热模塑技术成功制备了聚甲基丙烯酸甲酯(PMMA)和PS的微半球体阵列结构,光学聚光成像测试验证了PS和PMMA的微半球体阵列结构具有良好的光学成像功能,可以作为微透镜阵列使用。该技术简捷有效、成本低、精确度高、适用于大多数热塑性高聚物,它为球面微透镜阵列的制备提供了一种新的途径,有望用于昆虫复眼的生物仿生。
     3.微接触印刷技术制备高分子微阵列图案
     用十二烷基三氯硅烷(OTS)做“墨水”,通过微接触印刷技术将亲水性硅片表面组装成由亲水微区和疏水微区相间组成的微反应器阵列,将高分子反应体系(甲基丙烯酸甲酯+苯酚)引入到微反应器阵列内进行紫外光聚合,从而制备了图案化的PMMA微六角体阵列。研究结果表明微聚合反应是在疏水性的OTS微区内进行的,这完全符合(甲基丙烯酸甲酯+苯酚)的疏水去润特性;同时还发现微阵列内PMMA颗粒的形貌和大小与反应体系的组成有关。这种直接由高分子单体制备高分子微颗粒阵列是一种新的高分子微/纳米图案化技术,也为制备不同晶态的高分子微颗粒提供了一种新的研究途径。
     4.制备高分子链微观模型
     (1)分别用毛细微模塑技术和磁场自组装技术制备了单个的线型PS微球链,对各自的成链机理、成链条件以及链长的可控制性做了相关研究,发现磁场自组装技术更简捷有效。
     (2)分别采用加热软化和添加中间连接剂聚乙烯吡咯烷酮(PVP)两种途径将微球链上前后仅是物理相邻的PS微球粘接起来,研究结果发现:加热软化粘接起来的PS微球链极其脆弱,易断裂并散落开来,稳定性很差,而且不能够弯曲,呈现出明显的刚性特征,我们称之为“刚性高分子链”;由PVP粘接起来的线型PS微球链有一定的柔性和稳定性,我们称之为“柔性高分子链”,并将其作为真实高分子链的微观模型进行下一步的亚微观模拟工作。
     5.高分子链凝聚过程的亚微观模拟
     将PS微球视作高分子链的结构单元,将PVP粘接起来的线型PS微球链当作是真实高分子链的微观模型,通过溶剂挥发的途径分别对不同构型“高分子链”的凝聚过程进行亚微观模拟,观察到了不同条件下“高分子链”的凝聚过程和最终凝聚态,实验结果与已有的理论有一定程度的吻合。希望该工作能够抛砖引玉,为高分子凝聚态物理的研究工作提供一个新的研究思路。
P7olymer is the perfect micro/nano-meter architecture material because of the peculiar macromolecule chain structure、chemical and physical characteristic. Polymeric microstructures have special functions and had applications in the fields such as chemistry, biology, communication, and physics. Soft lithography (SL) is one low-cost and high-precision microfabrication technology, it can effectively fabricate abundant microstructures of many kinds of materials without costly equipments and rigorous environment. SL has a wonderful applied foreground.
     In this Ph.D. dissertation, author introduced SL technology into polymer science and fabricated polymeric microstructures via SL technology, these microstructures had been of value of scientific research or applications, the obtained results are summarized as following:
     1. Micromolding in Capillaries by Swollen Elastomeric Stamp
     The PDMS elastomeric stamp can be swelled by some organic solvent, the swollen PDMS stamp induce the distortion of microstructure, which is one of disadvantages of SL. We changed this disadvantage into one new advantage and obtained polymethylmethacrylate (PMMA) microstructure via micromolding in capillaries by the swollen PDMS elastomeric stamp (MIMICSES). In MIMICSES, the polymeric microstructure can be controlled by changing the amount of polymer solution and the external pressure. MIMICSES extends the variety of materials patterned via SL, and offers us a new microfabrication technique of polymer.
     2. Micro-lens Array of Polymer Fabricated via Micro-molding and Heating
     Micro-lens and micro-lens array are important optical components widely usedin many fields. Taking advantage of the principle of liquid or melting matters will be the most stable state by means of reducing its surface energy to minimum, the micro-hemispheroid arrays of PMMA and polystyrene (PS) were successfully obtained via micro-molding of SL and heating technology . The optical imaging testing indicated that these micro-hemispheroid arrays had good optical behavior and could be used as micro-lens arrays. This micro-molding & heating technology is easy and low-cost with high precision and can be suitable for other transparent plastics, it offers us a new microfabrication technique of polymer micro-lens array.
     3. Polymer Microstructures Array Fabricated via Micro-Contact Printing (μCP) Technique
     Using octadecyltrichlorosilane (OTS) as "ink", Micro-reactions array was fabricated viaμCP on hydrophilic silica, then the array was immerged into the reaction system making up of methylmethacrylate (MMA) & benzonphenone(BP) , and then polymerized by UV. PMMA microstructures array was obtained. Research results indicated that the micro-polymerization occurred in the hydrophobic OTS micro-area, which tallied hydrophobia characteristic of the reaction system. PMMA particles of microstructure array depended on the ratio MMA to BP. Micro-reactions array offers us an new polymer micro/nano- patterning technology which fabricates polymer micro/nano- particles array with monomer, and it also offers us an new method fabricating polymer micro/nano- particles with different crystals.
     4. Fabrication of the Micro-mold of Macromolecule Chain
     (1) Single linear PS microspheres chain was successfully obtained respectively via MIMIC technology and magnetic field self-assembly technology. We investigated respectively the mechanisms and condition of PS microspheres arranging into linear PS microspheres chain and the controllability of linear PS microspheres chain, and found that magnetic field self-assembly technology is better simple and effective.
     (2) The neighboring PS microspheres of linear microspheres chain were linked respectively by heating and polyvinylpyrrolidone (PVP) linker. The linear PS microspheres chain linked by heating was most brittle and ruptured under slight outside force, and didn't curve; we named it "rigid macromolecule chain". The linear PS microspheres chain linked by PVP was stable with some degree of flexibility; we named it "soft macromolecule chain" and looked it as the micro-mold of real macromolecule chain to simulate the condensed state of polymers in mesoscopic scale.
     5. Simulating. the Condensed Process of Macromolecule Chain in Mesoscopic Scale
     Looking the linear PS microspheres chain linked by PVP as the micro-mold of real macromolecule chain, we simulated respectively the condensing process of macromolecule chain with different configuration in mesoscopic scale by solvent-volatilizing, and observed the condensing action and condensed state of "soft macromolecule chain" at different conditions. The experiment results tallied the existing theories at certain degree. We hope that this work could offer one new method for the study of the condensed state physics of polymers.
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