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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。
In this paper, the linear comb polybutadiene (LC-PB-Sp) containing spiropyran groups and the star comb polybutadiene (SC-PB-Sp) containing spiropyran groups Effect of Branching Effect on Photochromic Properties. Both LC-PB-Sp and SC-PB-Sp were synthesized by anionic polymerization combined with “click chemistry”. The polymer structure was characterized by1H-NMR and FT-IR. The optical behavior of the polymer was measured using UV-Vis spectroscopy. The test results showed that the color fading rates were v (SC-PB-Sp)> v (LC-PB-Sp) -Sp)> v (Sp), indicating that the non-polar polybutadiene has the effect of stabilizing the non-polar closed-loop form of the spiropyran group. In addition, the spiropyran ring closure rate of SC-PB-Sp is faster than that of LC-PB-Sp due to its more compact polymer structure.