Page 132 - 《精细化工》2022年第11期
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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
                                                         1
                 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
                                           1
                 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。
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