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Nanocomposites of Polydiacetylene and Rare Earth Ions with Reversible Thermochromism
Kai-yu Fu,Dao-yong Chen*
Author NameAffiliationE-mail
Kai-yu Fu The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, Shanghai 200433, China  
Dao-yong Chen* The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, Shanghai 200433, China chendy@fudan.edu.cn 
Abstract:
We report a facile approach to water-dispersible polydiacetylene/rare earth ions nanocom-posites with reversible thermochromism. The nanocomposites were prepared by doping rare earth ions Dy3+ or Sm3+ into layer-structured 10,12-pentacosadiynoic acid (PCDA) nanopar-ticles to obtain PCDA/rare earth ions nanocomposites (PCDA-RE) and subsequently an-nealing PCDA-RE at the temperature slightly higher than the melting point of pure PCDA crystals, followed by topochemically polymerizing the annealed PCDA-RE. The polymerized PCDA-RE, i.e. poly(10,12-pentacosadiynoic acid)/rare earth ions nanocomposites (PDA-RE: PDA-Dy or PDA-Sm), are largely reversible (PDA-Sm) or even completely reversible (PDA-Dy) in the thermochromism, while, without the doping, pure PDA is completely irre- versible. It is con rmed that, PDA-RE are also layer-structured with a d-spacing of 5.4 nm, higher than the d-spacing of pure PDA (4.7 nm). In PDA-RE, the rare earth ions form a layer in-between and interact strongly with the PDA bilayers, being responsible for the high degree or even the complete reversibility. This is the rst example to make PDA completely reversible through the doping of rare earth ions; the annealing process is essential for the complete reversibility since it removes any defects in the structure.
Key words:  Polydiacetylenes, Rare earth ions, Reversible thermochromism, Thermal an-nealing
FundProject:
热致可逆变色的聚二炔/稀土离子纳米复合物
傅凯昱,陈道勇*
摘要:
将Dy+或Sm+掺杂到具有层状结构的10,12-二十五碳二炔酸(PCDA)纳米粒子中,得到二炔酸/稀土离子(PCDA-RE)纳米复合物.随后在稍微高于二炔酸熔点的温度下对PCDA-RE纳米复合物进行退火处理,退火后的PCDA-RE纳米复合物发生拓扑聚合反应得到聚二炔酸/稀土离子(PDA-RE)纳米复合物.虽然纯聚二炔酸的热致变色过程是不可逆的,但是PDA-Sm纳米复合物和PDA-Dy纳米复合物分别具有不完全和完全热致可逆变色的性能.研究表明,PDA-RE纳米复合
关键词:  聚二炔,稀土离子,热致可逆变色,热退火
DOI:10.1063/1674-0068/27/04/465-470
分类号: