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Development of coated conductive nano-wires by use of self-organized block copolymers

利用自组织嵌段共聚物开发涂层导电纳米线

基本信息

批准号：
14550011
负责人：
MINAGAWA Keiji
金额：
$ 2.43万
依托单位：
The University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

Block copolymers composed of poly(p-phenylene vinylene) (PPV) and poly(ethylene glycol) were synthesized. Pouring the copolymer solution into a polar solvent, which is a good solvent for PPV and a poor solvent for PEG, induced self-association of the obtained copolymers. Observation with a transmission electron microscope revealed the formation of nano-wires with the diameter of 10 nm and the length of more than 100 nm. The association of PPV segments was indicated from the UV and fluorescence spectroscopy. It was also found that the block copolymer could solubilize PPV homopolymer within the nano-wires formed in THF/water mixed solvent. Graft copolymers of PPV and PEG, which can be used as the self-association materials, were also successfully synthesized. From the above results, it is possible to prepare nano-wires having regulated shapes by adjusting the condition such as the composition and polymer concentration.Besides the PPV-based copolymers, other polymer associations were studied. The thermosensitive aggregation of poly(alkyl acylaminoacrylate)s was successfully controlled by replacement of various alkyl substituents. Urethane-modified PEG and other polyethers such as poly(propylene glycol) (PPG) and PEG/PPG copolymers were synthesized and the rheological properties under an electric field were examined in detail. The aggregation state of these polyethers can be reversibly changed in response to the electric field, which suggests the useful property of these polymers as an electrorheological fluid. Aqueous solutions of this kind of urethane-modified polyethers showed characteristic thermosensitive properties. The poly(alkyl acylaminoacrylate)s and polyethers responsive to temperature can be utilized as a component of nano-wires because of the controllability of association structures.

合成了由聚对苯基乙烯烯（PPV）和聚乙二醇组成的嵌段共聚物。将共聚物溶液倒入极性溶剂中（极性溶剂对PPV来说是好的溶剂，对PEG来说是不好的溶剂），可以诱导共聚物自缔合。通过透射电镜观察，形成了直径10 nm、长度超过100 nm的纳米线。紫外光谱和荧光光谱分析表明了PPV片段的结合。嵌段共聚物可以在THF/水混合溶剂中形成的纳米线中溶解PPV均聚物。还成功地合成了可作为自缔合材料的PPV和PEG接枝共聚物。根据上述结果，可以通过调整组成和聚合物浓度等条件来制备具有调节形状的纳米线。除ppv基共聚物外，还研究了其他聚合物的结合。通过取代不同的烷基取代基，成功地控制了聚烷基酰基氨基丙烯酸酯的热敏聚集。合成了聚氨酯改性聚乙二醇（PEG）及聚丙二醇（PPG）、PEG/PPG共聚物等聚醚，并对其在电场作用下的流变性能进行了详细研究。这些聚醚的聚集状态可以响应电场可逆地改变，这表明这些聚合物作为电流变流体的有用性质。这类聚氨酯改性聚醚的水溶液表现出特有的热敏性。对温度有响应的聚烷基酰基氨基丙烯酸酯和聚醚由于其缔合结构的可控性，可以作为纳米线的组成部分。