温度/ pH 敏感κ-卡拉胶接枝共聚物的合成、表征及溶胀性能。
Synthesis, characterization and swelling performance of a temperature/pH-sensitive κ-carrageenan graft copolymer.
机构信息
Alaca Avni Çelik Vocational School, Hitit University, 19600 Alaca, Çorum, Turkey; Department of Chemistry, Faculty of Arts and Sciences, Kırıkkale University, Yahşihan, 71450, Kırıkkale, Turkey.
Department of Chemistry, Faculty of Arts and Sciences, Kırıkkale University, Yahşihan, 71450, Kırıkkale, Turkey.
出版信息
Int J Biol Macromol. 2020 Jun 1;152:359-370. doi: 10.1016/j.ijbiomac.2020.02.129. Epub 2020 Feb 13.
A binary graft copolymerization of dimethylaminoethyl methacrylate (DMAEMA) and acrylic acid (AA) onto κ-carrageenan (CG) was performed by using microwave irradiation in the presence of 4,4'-Azobis(4-cyanovaleric acid) (ACVA). The structure of the CG-g-P(DMAEMA/AA) copolymers was confirmed using C NMR, FTIR, DSC/TGA and XRD. The effects of the DMAEMA/AA ratio, the microwave power and irradiation duration, and the concentrations of CG and ACVA on grafting yield and grafting efficiency were all investigated, and the best values of them were found to be 150% and 85%, respectively. The lower critical solution temperatures (LCST) for CG-g-P(DMAEMA/AA) copolymers at various pH conditions were determined, and when the pH value of the medium was increased from 1.2 to 10, the LCST of the copolymer decreased from 53 °C to 39 °C. Moreover, swelling performance of the copolymers under various pH conditions was examined, and it was observed that the swelling ratio of the copolymer increased with a decrease in the pH value of the medium.
通过在 4,4'-偶氮双(4-氰基戊酸)(ACVA)存在下使用微波辐射，将二甲基氨基乙基甲基丙烯酸酯(DMAEMA)和丙烯酸(AA)二元接枝共聚到κ-卡拉胶(CG)上。使用 C NMR、FTIR、DSC/TGA 和 XRD 证实了 CG-g-P(DMAEMA/AA)共聚物的结构。研究了 DMAEMA/AA 比、微波功率和辐照时间以及 CG 和 ACVA 的浓度对接枝率和接枝效率的影响，发现最佳值分别为 150%和 85%。在不同 pH 值条件下测定了 CG-g-P(DMAEMA/AA)共聚物的低临界溶液温度(LCST)，当介质的 pH 值从 1.2 增加到 10 时，共聚物的 LCST 从 53°C 降低到 39°C。此外，还研究了共聚物在不同 pH 值条件下的溶胀性能，观察到共聚物的溶胀比随介质 pH 值的降低而增加。
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