Fabrication, functionalization, and exploration of polymer -based rancdevices

聚合物基 Ranc 器件的制造、功能化和探索

基本信息

批准号：
17201033
负责人：
KAWATA Satoshi
金额：
$ 31.03万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

We experimentally presented proof that several mechanical properties of polymer, such as elasticity, viscoelasticity, and glass transition temperature, are dependent on the size of the polymer in nano meter scale. To our knowledge, this result is the first report of the size -effect on mechanical property of nano materials. We fabricated nano spring made of 〜200 nm diameter poly (methylmethacrylate) nanowire by means of two-photon photopolymerization. We manipulated the fabricated nano spring in solution by laser trapping method, and measured the spring constant of the nano spring. We installed temperature controllable stage into our hand -made laser trapping system, which made it possible to change the temperature of the nano spring from about 200 to 400 K during spring constant measurement. First, we found that the elasticity of nano size polymer is 109 times smaller than that of the bulk of the same material. This giant elasticity is not related to degree of polymerization, or solve … More nt, but purely dependent on the size of polymer. We also observed that transition temperature of the polymer changes remarkably depending on the size of polymer. Actually, the transition temperature decreased more than 40 K when the size of the nano spring was decreased from 450 nm to 150 nm. The experimental data also suggest a novel functionality in polymer based nano devices, which is reversible temperature -switchable elasticity/viscoelasticity. The change of elasticity/viscoelasticity by transition temperature is actually intrinsic in any polymer materials, and so not surprising, though the glass transition temperature of bulk polymer is usually 〜370 K. However by designing the size of polymer structures at the nanoscale, it becomes possible to control the switching temperature, even at room temperature. We also developed new polymer materials functionalized by az o-benzene contained monomers. This polymer shows refractive index change and volume change by light irradiation. We fabricated three -dimensional photonic crystals by two-photon polymeriation, and demonstrated optical switching of photonic bandgaps. Since the refractive index and volume change is induced by photo -isomerization of azo-benzene derivative, the optical switching of photonic bandgaps is reversible. These novel mechanical and optical functions we have shown through this project are intrinsic to nano-sized polymers, and would lead to exploring future novel polymer-based nanodevices. Less

我们通过实验证明了聚合物的多种机械性能，例如弹性、粘弹性和玻璃化转变温度，取决于纳米级聚合物的尺寸，据我们所知，该结果是尺寸效应的第一份报告。我们通过双光子光聚合方法制备了由直径约 200 nm 的聚（甲基丙烯酸甲酯）纳米线制成的纳米弹簧，并通过激光捕获方法在溶液中操纵了制备的纳米弹簧。我们在手工制作的激光捕获系统中安装了温度可控的平台，这使得在弹簧常数测量过程中可以将纳米弹簧的温度从大约 200 K 改变到 400 K。我们还观察到，纳米尺寸聚合物的弹性比相同材料的本体小 109 倍，这种巨大的弹性与聚合度或解无关，而纯粹取决于聚合物的尺寸。那个转变实际上，当纳米弹簧的尺寸从 450 nm 减小到 150 nm 时，聚合物的温度会发生明显的变化。实验数据还表明聚合物具有新的功能。纳米器件，可逆温度切换弹性/粘弹性弹性/粘弹性的变化实际上是任何聚合物材料所固有的，因此并不奇怪，尽管本体聚合物的玻璃化转变温度通常是~370 K。然而，通过设计纳米级聚合物结构的尺寸，即使在室温下也可以控制转换温度。我们还开发了由含偶氮苯的单体功能化的新型聚合物材料。我们通过双光子聚合制备了三维光子晶体，并证明了光子带隙的光学开关，因为折射率和体积变化是由光引起的。 -偶氮苯衍生物的异构化，光子带隙的光学转换是可逆的，我们通过这个项目展示的这些新颖的机械和光学功能是纳米级聚合物所固有的，并将导致未来探索基于聚合物的新型纳米器件。