Sulfonated Styrene-Acrylic Acid Copolymers with pH-Indicator Property

被引：1
|
作者：
Fan, Xin [1 ,2 ]
Fan, Ping [3 ]
Wu, Yuehuan [2 ]
机构：
[1] Shanghai Univ Engn Sci, Coll Chem & Chem Engn, Shanghai 201620, Peoples R China
[2] Taiyuan Inst Technol, Dept Chem & Chem Engn, Taiyuan 030008, Shanxi, Peoples R China
[3] North Univ China, Sch Mat Sci & Engn, Taiyuan 030051, Shanxi, Peoples R China
来源：
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY | 2019年 / 30卷 / 09期
基金：
山西省归国人员基金;
关键词：
polymers; sulfonated; pH-indicator; reusability; EXCHANGE; SENSORS;
D O I：
10.21577/0103-5053.20190107
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
In this study, a polymer pH-indicator was synthesized by sulfonation of poly(styrene-coacrylic acid) with concentrated sulfuric acid. The synthesized polymer pH-indicator exhibited pH-responsive color changes in aqueous solutions, being purple in alkaline medium (pH < 4), whereas yellow in acidic medium (pH > 9). The sulfonation process extent and polymer color were affected by time and temperature of the process, as well as acrylic acid (AA) content. The addition of acrylic acid was a crucial point for color change due to the facility of cyclic ketone structure to turn into phenol under acidic condition. Compared with low molecule pH-indicators, the sulfonated copolymer was prepared in form of films being repeatedly used as pH-indicator and easily removed from the acid-base medium.
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页码：1941 / 1946
页数：6
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