高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (5): 1078-1083.doi: 10.7503/cjcu20170754

• 高分子化学 • 上一篇    下一篇

Gemini对PVA分散螺吡喃有机凝胶薄膜光致变色行为的调控

龙世军1,2, 陈明敏1,2, 赵友姣1,2, 王小涛1,2, 李学锋1,2, 廖永贵3   

  1. 1. 湖北工业大学材料与化学工程学院, 2. 绿色轻工材料湖北省重点实验室, 武汉 430068
    3. 华中科技大学化学与化工学院, 武汉 430074
  • 收稿日期:2017-11-12 出版日期:2018-04-04 发布日期:2018-04-04
  • 作者简介:

    联系人简介: 李学锋, 男, 博士, 教授, 主要从事高强度智能水凝胶研究. E-mail: li_xf@mail.hbut.edu.cn;廖永贵, 男, 博士, 教授, 主要从事有序功能高分子复合材料研究. E-mail: ygliao@mail.hust.edu.cn

  • 基金资助:
    国家自然科学青年基金(批准号: 51603065)和湖北省教育厅青年人才项目(批准号: Q20151406)资助.

Regulation of Gemini Surfactant on Photochromic Behavior of PVA Dispersed Spiropyran Organogel Thin Film

LONG Shijun1,2, CHEN Mingmin1,2, ZHAO Youjiao1,2, WANG Xiaotao1,2, LI Xuefeng1,2,*, LIAO Yonggui3,*   

  1. 1. School of Materials and Chemical Engineering, 2. Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan 430068, China
    3. School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:2017-11-12 Online:2018-04-04 Published:2018-04-04
  • Contact: LI Xuefeng,LIAO Yonggui
  • Supported by:
    Supported by the National Natural Science Youth Foundation of China(No.51603065) and the Youth Project of Hubei Provincial Education Department, China(No.Q20151406).

摘要:

通过共溶剂-乳化-溶剂挥发法制备了聚乙烯醇(PVA)分散螺吡喃(SP)光致变色有机凝胶薄膜(PDPG-SP), 采用双子型表面活性剂六亚甲基-1,6-双十二烷基二甲基溴化铵(Gemini)调控聚合物/有机凝胶界面相互作用, 系统研究了薄膜光致变色行为、 褪色行为、 微观结构形貌、 力学性能及耐疲劳性能. 结果表明, PDPG-SP薄膜表现出良好的光致变色行为与类溶液的褪色行为, SP在薄膜中褪色速率与聚丙二醇(PPG)溶液相近; 薄膜具有优异的力学性能, 其弹性模量与拉伸强度分别高达~547和~23.5 MPa; 经过10次变色-褪色循环后, 薄膜最大吸收波长处吸光度A衰减了约35 %, 相比以PVA1为表面活性剂(衰减约53%), 耐疲劳性明显提升. Gemini有序聚集过程中头基分离力的有效阻抑, 抑制了PVA/有机凝胶界面对SP的锚定, 使更多SP分子分布于自由异构的有机凝胶微环境, 提高薄膜褪色速率, 同时可逆异构分子数量的增加, 使薄膜耐疲劳性提高.

关键词: 光致变色, 螺吡喃, Gemini表面活性剂, 聚乙烯醇, 褪色速率, 耐疲劳性

Abstract:

Polyvinyl alcohol(PVA) dispersed spiropyran(SP) organogel thin film(PDPG-SP) was prepared by a facile co-solvent-evaporation strategy. 1,6-Didodecyl(dimethyl) azanium bromide hexamethylene used to regulate interface interaction between PVA/organogel was used as one sort of Gemini surfactant. The photochromic and fading behavior, microstructure morphology, mechanical properties and light fatigue resistance of PDPG-SP were investigated. The results show that the thermal decay behavior for PDPG-SP film is similar to that of SP/PPG solution. Interestingly, PDPG-SP also has excellent mechanical property with elastic modulus and tensile strength as high as ca. 547 and ca. 23.5 MPa respectively. After 10 repeated coloration-discoloration cycles, the intensity at the maximum absorption wavelength decreases by about 35%, which was decreased dramatically comparing with that using PVA1 as a surfactant(ca. 53%). Based on the separation force by head-end gathering process of Gemini, the anchor effect of PVA/organogel interface on SP is suppressed. Meanwhile, more SP molecules were protected within micro-solvent environment, which was homogeneously dispersed in PVA matrix. The anchor effect increases the number of SP molecules that could conduct reversible free isomerization, accelerating the fading rate and improving the fatigue resistance of the PDPG-SP thin film concurrently.

Key words: Photochromic, Spiropyran, Gemini surfactant, Polyvinyl alcohol, Fading rate, Fatigue resistance

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