Department of Chemistry, Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials, Wuhan University, Wuhan 430072, China.
ACS Appl Mater Interfaces. 2009 Apr;1(4):856-63. doi: 10.1021/am800255t.
For the first time, a series of dendronlike main-chain polyurethanes have been successfully designed and synthesized, in which different isolation groups with different sizes were introduced to modify the subtle structure of the used "H"-type chromophores, according the concept of "suitable isolation groups". Thanks to the advantages of "H"-type chromophores and the introduced suitable isolation group, all of the polymers demonstrated large NLO effects, good processability, improved optical transparency, and thermal stability. The obtained experimental results indicated that the utilization of "H"-type chromophores might be a promising choice to efficiently translate the large beta values of the organic chromophores into high macroscopic NLO activities of polymers.
首次成功设计并合成了一系列树枝状主链型聚氨酯，根据“合适的隔离基团”的概念，在其中引入了不同尺寸的不同隔离基团来修饰所使用的“H”型发色团的细微结构。得益于“H”型发色团和引入的合适隔离基团的优势，所有聚合物均表现出较大的 NLO 效应、良好的加工性能、提高的光学透明度和热稳定性。获得的实验结果表明，利用“H”型发色团可能是一种很有前途的选择，可以有效地将有机发色团的大β值转化为聚合物的高宏观 NLO 活性。
