Page 132 - 《精细化工》2022年第11期
P. 132
第 39 卷第 11 期 精 细 化 工 Vol.39, No.11
2 022 年 11 月 FINE CHEMICALS Nov. 2022
功能材料
pH、温度和光三重敏感的 PDMAEMA-AZO 的研究
侯玉梅 1,2 ,杨 栋 1,2 ,黄如霞 1,2 ,罗春华 1,2* ,董秋静 1,2*
(1. 阜阳师范大学 化学与材料工程学院,安徽 阜阳 236037;2. 环境污染物降解与监测安徽省重点实
验室,安徽 阜阳 236037)
摘要:在含偶氮苯的三硫酯链转移剂(CTA-AZO)存在下,将甲基丙烯酸二甲氨基乙酯(DMAEMA)通过可
逆加成断裂链转移(RAFT)聚合,制备了 pH、温度和光三重敏感的含偶氮苯端基的聚甲基丙烯酸二甲氨基乙
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酯聚合物(PDMAEMA-AZO)。采用 UV、FTIR、 HNMR 和 GPC 对 PDMAEMA-AZO 的结构进行了表征,并
考察了聚合物的光敏性、温敏性和 pH 敏感性。结果表明,PDMAEMA-AZO 的相对分子质量可控,且相对分子
质量分布(PDI)≤1.78。PDMAEMA-AZO 在氯仿、乙醇和水中均能够快速进行可逆光致顺反异构反应,在紫
外与可见光的交替照射下,快速达到光稳态。与聚甲基丙烯酸二甲氨基乙酯(PDMAEMA)相比,PDMAEMA-AZO
的低临界溶解温度(LCST)更低。随着聚合物浓度的增加,PDMAEMA-AZO 的 LCST 降低,且相变窗口变窄。
当 pH≥9.44 时,PDMAEMA-AZO 的 LCST 保持不变,pH 由 9.44 下降到 7.34 时,LCST 升高,pH<7.34 时不再
具有温敏性,说明 PDMAEMA-AZO 是一种 pH 控制的具备 LCST 的温敏性聚合物。在紫外与可见光交替照射下,
PDMAEMA-AZO 的 LCST 表现为可逆的升高和降低,表明聚合物 PDMAEMA-AZO 具备光控温敏性。
关键词:聚甲基丙烯酸二甲氨基乙酯;RAFT 聚合;光敏性;温敏性;偶氮苯;功能材料
中图分类号:TQ317 文献标识码:A 文章编号:1003-5214 (2022) 11-2282-08
Studies on pH/temperature/light triple-sensitive PDMAEMA-AZO
1,2
1,2
1,2
HOU Yumei , YANG Dong , HUANG Ruxia , LUO Chunhua 1,2* , DONG Qiujing 1,2*
(1. School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang 236037, Anhui, China;
2. Anhui Provincial Key Laboratory for Degradation and Monitoring of the Pollution of the Environment, Fuyang
236037, Anhui, China)
Abstract: Azobenzene-terminated poly(dimethylaminoethylmethacrylate) (PDMAEMA-AZO) with pH,
temperature and light triple-sensitivity was synthesized by reversible addition fragmentation chain transfer
(RAFT) polymerization of dimethylaminoethylmethacrylate (DMAEMA) in the presence of azobenzene-
containing trithiocarbonate chain transfer agent (CTA-AZO). The structure of PDMAEMA-AZO obtained
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was characterized by UV, FTIR, HNMR and GPC, followed by investigation on its photo-thermal-pH triple
response. The results indicated that PDMAEMA-AZO, with controllable relative molecular mass and a
polymer dispersity index (PDI) ≤1.78, could undergo reversible light-induced cis-trans isomerization
rapidly in water, ethanol and chloroform, while achieve quick photostability under the alternating irradiation
of ultraviolet and visible light. Meanwhile, in comparison to PDMAEMA, PDMAEMA-AZO exhibited a
reduced lower critical solution temperature (LCST), which decreased along with the increase of polymer
concentration, and narrower phase transition temperature range. The LCST of PDMAEMA-AZO remained
unchanged when pH≥9.44, increased when pH dropped from 9.44 to 7.34, and the polymer no longer
showed thermo-sensitivity when the pH<7.34. Moreover, The LCST of the polymer reversibly increased
and decreased under the alternating irradiation of UV and visible light, indicating that PDMAEMA-AZO
had pH and light-controlled thermos-sensitivity.
收稿日期:2022-01-18; 定用日期:2022-06-17; DOI: 10.13550/j.jxhg.20220065
基金项目:安徽高校优秀青年人才支持计划项目(gxyq2020027);省级大学生创新训练项目(S202010371054,S202010371070)
作者简介:侯玉梅(1995—),女,硕士生,E-mail:1497851574@qq.com。联系人:罗春华(1979—),男,教授,E-mail:lch197919@
163.com;董秋静(1980—),女,副教授,E-mail:dongqj1980@163.com。