Preparation and Photoresponsive Properties of Lignin-graft Azobenzene-Containing Liquid Crystalline Copolymers

Zhen-yao Wei; Yong-hong Deng; Hai-feng Yu; Xue-qing Qiu

doi:10.11777/j.issn1000-3304.2016.15307

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Preparation and Photoresponsive Properties of Lignin-graft Azobenzene-Containing Liquid Crystalline Copolymers

Research Article | 更新时间：2021-03-19

- Preparation and Photoresponsive Properties of Lignin-graft Azobenzene-Containing Liquid Crystalline Copolymers
- Acta Polymerica Sinica Issue 6, Pages: 742-749(2016)
- 作者机构：
  
  1.华南理工大学化学与化工学院制浆造纸工程国家重点实验室广州 510640
  2.北京大学工学院材料科学与工程系高分子化学与物理教育部重点实验室北京 100871
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2016.15307
  CLC：
- Published：2016-6，
  
  Received：11 November 2015，
  
  Revised：16 December 2015，
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Zhen-yao Wei, Yong-hong Deng, Hai-feng Yu, Xue-qing Qiu. Preparation and Photoresponsive Properties of Lignin-graft Azobenzene-Containing Liquid Crystalline Copolymers. [J]. Acta Polymerica Sinica (6):742-749(2016)
DOI：

Zhen-yao Wei, Yong-hong Deng, Hai-feng Yu, Xue-qing Qiu. Preparation and Photoresponsive Properties of Lignin-graft Azobenzene-Containing Liquid Crystalline Copolymers. [J]. Acta Polymerica Sinica (6):742-749(2016) DOI： 10.11777/j.issn1000-3304.2016.15307.

摘要

以天然高分子木质素为原料

通过亲核取代反应将木质素改性成为大分子引发剂

引发偶氮苯单体的原子转移自由基聚合(ATRP)

得到一系列木质素基光响应聚合物.接枝后的木质素的热稳定性明显改善

且平均接枝率达到72.8%时才能表现出液晶行为.小角X射线散射和偏光显微镜的结果表明所形成的液晶相为近晶C型

层间距为3.21nm.在此基础上

用紫外-可见吸收光谱(UV-Vis)对木质素基液晶聚合物的光响应性进行研究

发现溶液中的光响应性比膜状态的光响应速率快.在紫外光的辐照下

木质素基液晶聚合物表现出快速的光致液晶-各向同性相变行为.

Abstract

Lignin-based macroinitiator was synthesized by nucleophilic substitution reaction of lignin and 2-bromoisobutyryl bromide

which was used to initiate atom transfer radical polymerization of an azobenzene-containing monomer to obtain a series of lignin-graft photoresponsive liquid crystalline copolymers. The molecular structures and molecular weights of the graft copolymers were confirmed by

H-NMR

FTIR and GPC. The thermal properties of lignin-graft azobenzene-containing copolymers showed improved behaviors superior to that of unmodified lignin by measurements of thermal gravimetric analyzer (TGA) and differential scanning calorimeter (DSC). Furthermore

the modified lignin-graft azo copolymers exhibited liquid crystalline behaviors once their average grafting ratio were higher than 72.8% and the molecular weights of lignin-graft azo copolymer were higher than 19500 correspondingly. The liquid crystalline phases of lignin-graft azobenzene copolymers were shown to be the smetic C phase and the layer spacing was 3.21 nm evaluated by small-angel X-ray scattering (SAXS) and polarizing optical micrograph (POM). Moreover

the photoresponsive properties of lignin-based liquid crystalline copolymers were investigated using UV-Vis absorption spectroscopy

and the lignin-graft liquid crystalline copolymers in solution were more sensitive than that of the as-cast films. Photochemical liquid crystal to isotropic phase transition of the copolymer was successfully obtained upon UV irradiation

and the reversible isotropic to liquid crystal phase transition was exhibited rapidly when it was exposed to visible light.

关键词

木质素液晶聚合物偶氮苯光响应性

Keywords

LigninLiquid crystalline copolymerAzobenzenePhotoresponse

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