title: Dendronlike main-chain nonlinear optical (NLO) polyurethanes constructed from "H"-type chromophores: synthesis and NLO properties.
abstract: 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.
authors.affiliation: Department of Chemistry, Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials, Wuhan University, Wuhan 430072, China.
authors.forename: Zhong'an
authors.initials: Z
authors.lastname: Li
authors.forename: Wenbo
authors.initials: W
authors.lastname: Wu
authors.forename: Gui
authors.initials: G
authors.lastname: Yu
authors.forename: Yunqi
authors.initials: Y
authors.lastname: Liu
authors.forename: Cheng
authors.initials: C
authors.lastname: Ye
authors.forename: Jingui
authors.initials: J
authors.lastname: Qin
authors.forename: Zhen
authors.initials: Z
authors.lastname: Li