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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

我们的实验证明，聚合物的几个机械性能，如弹性，粘弹性，和玻璃化转变温度，是依赖于纳米尺度的聚合物的尺寸。据我们所知，这是首次报道纳米材料力学性能的尺寸效应。采用双光子光聚合法制备了直径约为200 nm的聚甲基丙烯酸甲酯纳米线纳米弹簧。利用激光陷阱法对制备的纳米弹簧进行了溶液操控，并测量了弹簧的弹性常数。我们在自制的激光捕获系统中安装了温度可控平台，使得在测量弹簧常数时可以在200 ~ 400 K之间改变纳米弹簧的温度。首先，我们发现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无关，或解决了 ...更多信息 nt，但完全取决于聚合物的尺寸。我们还观察到，聚合物的转变温度的变化显着依赖于聚合物的大小。实际上，当纳米弹簧的尺寸从450 nm减小到150 nm时，相变温度降低了40 K以上。实验数据还表明了基于聚合物的纳米器件中的新功能，其是可逆的温度可切换的弹性/粘弹性。弹性/粘弹性随转变温度的变化实际上是任何聚合物材料固有的，因此并不令人惊讶，尽管本体聚合物的玻璃化转变温度通常为370 K。然而，通过在纳米级设计聚合物结构的尺寸，即使在室温下也可以控制开关温度。我们还开发了含偶氮苯单体功能化的新型高分子材料。该聚合物通过光照射显示折射率变化和体积变化。利用双光子聚合技术制备了三维光子晶体，并研究了光子晶体带隙的光开关。由于偶氮苯衍生物的光致异构化引起折射率和体积的变化，因此光子带隙的光开关是可逆的。这些新的机械和光学功能，我们已经通过这个项目显示是固有的纳米尺寸的聚合物，并将导致探索未来的新型聚合物为基础的纳米器件。少