Photochromic polysiloxanes substituted with 1,2-Bis(2-methylbenzo[b]thiophene-3-yl)hexafluorocyclopentene

被引:0
作者
Hee-Won Shin
Yong-Rok Kim
Eunkyoung Kim
机构
[1] Yonsei University,Department of Chemistry
[2] Yonsei University,Department of Chemical Engineering
来源
Macromolecular Research | 2005年 / 13卷
关键词
photochromism; diarylethene polymer; free inner volume; quantum yield; average lifetime;
D O I
暂无
中图分类号
学科分类号
摘要
Photochromic diarylethene polymers (DPs) in which 1,2-bis(2-methylbenzo[b]thiophene-3-yl)hexafluorocyclopentene (BTF6) were covalently grafted onto the polymer main chain as pendant photochromic units were newly synthesized and their photochromic properties were investigated using steady-state and picosecond timeresolved spectroscopies. Polysiloxanes substituted with BTF6 molecules were prepared by sol-gel process using a mixture of tetraethoxysilane (TEOS), a silylated BTF6, and an organically modified silane precursor in the presence of HCl. The polysiloxane film (DP1) prepared from ω-methoxy poly(ethylene glycol) 3-(triethoxysilyl) propylcarbamate (MPGSC) as the silane precursor showed a much lower glass transition temperature than that (DP2) from heptadecafluorodecyltrimethoxysilane (HDFTMS). The ring-closure quantum yields ofDP1 andDP2 were determined to be 0.20 and 0.02, respectively. Such a large difference in the quantum yield was attributed to the polymer matrix environment of the free inner volume.
引用
收藏
页码:321 / 326
页数:5
相关论文
共 95 条
[1]  
Irie M.(1988)undefined J. Org. Chem. 53 803-803
[2]  
Mohri M.(1996)undefined Pure Appl. Chem. 68 1367-1367
[3]  
Irie M.(1995)undefined Angew. Chem. Int. Ed. Engl. 34 1119-1119
[4]  
Tsivgoulis G. M.(1998)undefined Eur. J. Org. Chem. 1998 2333-2333
[5]  
Lehn J.-M.(1997)undefined Chem. Phys. Lett. 269 281-281
[6]  
Bens A. T.(2000)undefined Chem. Phys. Lett. 328 234-234
[7]  
Frewert D.(1998)undefined Chem. Phys. Lett. 293 555-555
[8]  
Kodatis K.(2002)undefined Opt. Mater. 21 279-279
[9]  
Kryschi C.(1992)undefined J. Am. Chem. Soc. 114 8715-8715
[10]  
Martin H.-D.(1994)undefined J. Am. Chem. Soc. 116 9894-9894