含螺吡喃基团的高支化聚丁二烯中支化效应对光致变色性能的影响

Effect of Dendritic Architecture on Photochromism of Spiropyran Functionalized Dendrigraft Polybutadiene

本文主要阐述了含有螺吡喃基团的线型梳状聚丁二烯(LC-PB-Sp)及含有螺吡喃基团的星型梳状聚丁二烯(SC-PB-Sp)的支化效应对光致变色性能的影响。LC-PB-Sp和SC-PB-Sp均采用阴离子聚合结合"点击"化学的方式合成,聚合物结构采用1H-NMR及FT-IR进行表征。聚合物的光学行为采用UV-Vis光谱检测。测试结果表明上色速度依次为v(Sp)>v(SC-PB-Sp)>v(LC-PB-Sp),而褪色速度依次为v(SC-PB-Sp)>v(LC-PB-Sp)>v(Sp),表明非极性的聚丁二烯有稳定非极性闭环形式螺吡喃基团的作用。此外,SC-PB-Sp的螺吡喃闭环速度较LC-PB-Sp快,这是由于其较为致密的聚合物结构造成的。

The photochromic behavior of two novel spiropyran functionalized dendrigraft polybutadiene with linear-comb and star-comb architectures （LC-PB-Sp and SC-PB-Sp, respectively） was demonstrated. LC-PB-Sp and SC-PB-Sp were synthesized via the com- bination of anionic polymerization and ＂click＂ chemistry methodology. The photochromic behavior was investigated based on UV-Vis spectroscopy. The results showed that the coloring speed was in an order of v （Sp） 〉v （SC-PB-Sp） 〉v （LC-PB-Sp） , while the discoloration speed exhibited in an order of v （SC-PB-Sp） 〉v （LC-PB-Sp） 〉v （Sp）, suggesting that the nonpolar dendritic PB matrices tended to stabilize the nonpolar closed form of spiropyran. Furthermore, the retrieval rate of SC-PB-Sp was much faster than its corresponding LC-PB-Sp due to its more compact structure.