Azobenzene-Based (Meth)acrylates: Controlled Radical Polymerization, Photoresponsive Solid-Liquid Phase Transition Behavior, and Application to Reworkable Adhesives
Azobenzene-Based (Meth)acrylates: Controlled Radical Polymerization, Photoresponsive Solid-Liquid Phase Transition Behavior, and Application to Reworkable Adhesives
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DOI：
10.1021/acs.macromol.8b00156
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发表时间：
2018-05-08
期刊：
影响因子：
5.5
通讯作者：
Yoshida, Masaru
中科院分区：
文献类型：
--
作者：
Ito, Shotaro;Yamashita, Aishi;Yoshida, Masaru
采用原子转移自由基聚合（ATRP）方法，研究了含偶氮苯单体丙烯酸10- [4-（4-己基苯偶氮）苯氧基]癸酯（10- [4-（4-hexylphenylazo）boxy]decyl acrylate）的活性聚合，在等温条件下，光诱导偶氮苯基团形状发生可逆的固液相变，使聚丙烯酸酯和相应的聚甲基丙烯酸酯发生可逆的固液相变.辐射引起的性质变化进行了研究，通过核磁共振，紫外可见（UV-维斯）吸收光谱，和动态粘弹性测量，重点是主链的化学结构和分子量的影响。聚丙烯酸酯的偶氮苯部分光异构化和伴随的相变比聚甲基丙烯酸酯快，这表明主链结构的强烈影响。最后，通过单搭接剪切试验研究了使用偶氮聚合物粘结的玻璃基材的粘合强度的光调节，其中>3 MPa的最大粘合强度与商业热熔粘合剂的粘合强度相当。用UV光照射仅15秒就将粘合强度降低到约100 μ m。
Atom transfer radical polymerization was employed to induce the living polymerization of an azobenzene-containing monomer, 10- [4-(4-hexylphenylazo)phenoxy]decyl acrylate, with the resulting polyacrylate and the corresponding polymethacrylate undergoing a reversible solid liquid phase transition under isothermal conditions caused by the photoinduced change of the azobenzene moiety shape. Irradiation-induced property changes were investigated by nuclear magnetic resonance, ultraviolet visible (UV- vis) absorption spectroscopy, and dynamic viscoelasticity measurements, with focus on the effects of the main chain chemical structure and molecular weight. Azobenzene moiety photoisomerization and the concomitant phase transition were faster for the polyacrylate than for the polymethacrylate, which indicated the strong influence of the main chain structure. Finally, phototuning of the adhesion strength using azopolymer-bonded glass substrates was studied by single lap shear tests, with the maximum adhesion strength of >3 MPa being comparable to that of commercial hot-melt adhesives. Irradiation with UV light for only 15 s lowered the adhesion strength to