Synthesis of novel side‐chain triphenylamine polymers with azobenzene moieties via RAFT polymerization and investigation on their photoelectric properties
Synthesis of novel side‐chain triphenylamine polymers with azobenzene moieties via RAFT polymerization and investigation on their photoelectric properties
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DOI：
10.1002/pola.26167
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发表时间：
2012-09
期刊：
影响因子：
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通讯作者：
Yan Sun;Nianchen Zhou;Wei Zhang-;Yaowen Li;Zhenping Cheng;Jian Zhu;Zhengbiao Zhang;Xiu-lin Zhu
中科院分区：
文献类型：
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作者：
Yan Sun;Nianchen Zhou;Wei Zhang-;Yaowen Li;Zhenping Cheng;Jian Zhu;Zhengbiao Zhang;Xiu-lin Zhu
两种新型且结构明确的聚合物，聚（6-（5-（二苯氨基）-2-（（4-甲氧基苯基）二氮烯基）苯氧基）甲基丙烯酸己酯）（PDMMA）和聚（6-（4-（（3-乙炔基苯基）二氮烯基）苯氧基）甲基丙烯酸己酯）（PDPMMA）， 通过可逆加成断裂链转移聚合技术，成功地制备了直接（PDMMA）或间隔（PDPMMA）作为侧基掺入偶氮苯的三苯胺（TPA）。通过循环伏安（CV）测量研究了PDPMMA和PDMMA的电化学行为。通过将 J-V（电流-电压）曲线拟合到空间电荷限制电流法中来确定聚合物薄膜的空穴迁移率。研究了偶氮苯部分的光异构化对这两种聚合物的荧光发射、CV和空穴迁移率行为的影响。这两种聚合物在CH2Cl2中的荧光发射强度在UV照射后增加了约100倍。 PDMMA 和 PDPMMA 在 CH2Cl2 中的氧化峰电流 (IOX) 在 UV 照射后增加。与PDPMMA相比，PDMMA中偶氮苯部分的光致异构化对电化学行为有显着影响。两种聚合物的空穴迁移率在紫外线照射前后的变化非常小。通过理论计算得到了PDMMA和PDPMMA中偶氮苯顺式异构体和反式异构体掺入的TPA侧链部分的HOMO能量（EHOMO、HOMO：最高占据分子轨道），与实验结果基本一致。 VC 2012 Wiley periodicals, Inc. J Polym Sci Part A：Polym Chem 50：3788-3796，2012
Two novel and well-defined polymers, poly(6-(5-(diphe- nylamino)-2-((4-methoxyphenyl)diazenyl)phenoxy)hexyl methacry- late) (PDMMA) and poly(6-(4-((3-ethynylphenyl)diazenyl) phenoxy)hexyl methacrylate) (PDPMMA), which bear triphenyl- amine (TPA) incorporated to azobenzene either directly (PDMMA) or with an interval (PDPMMA) as pendant groups were successfully prepared via reversible addition-fragmentation chain transfer polymerization technique. The electrochemical behaviors of PDPMMA and PDMMA were investigated by cyclic voltammograms (CV) measurement. The hole mobilities of the polymer films were determined by fitting the J-V (current-voltage) curve into the space-charge-limited current method. The influence of photoisomerization of the azobenzene moiety on the behaviors of fluorescence emission, CV and hole mobilities of these two polymers were studied. The fluorescent emission intensities of these two polymers in CH2Cl2 were increased by about 100 times after UV irradiation. The oxidation peak currents (IOX )o f the PDMMA and PDPMMA in CH2Cl2 were increased after UV irradia- tion. The photoisomerization of the azobenzene moiety in PDMMA had significant effect on the electrochemical behavior, compared with that in PDPMMA. The changes of the hole mobility before and after UV irradiation were very small for both polymers. The HOMO energies (EHOMO, HOMO: the highest occupied molecular orbital) of side chain moieties of TPA incorporated with cis-isomer and trans-isomer of azobenzene in PDMMA and PDPMMA were obtained by theoretical calculation, which are basically consistent with the experimental results. V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 3788-3796, 2012