Preparation of a thermosensitive cobalt phthalocyanine/N-isopropylacrylamide copolymer and its catalytic activity on thiol.
A thermosensitive copolymer of cobalt tetra(N-acryliccarbonyl)aminophthalocyanine (Co-TACAPc) and N-isopropylacrylamide (NIPA) was prepared through redox polymerization in aqueous solution, and its catalytic activity for oxidation of 2-mercaptoethanol was investigated. The products of Co-TACAPc and its copolymer were characterized by elemental analysis, IR, UV/vis, and TGA. The copolymer can be dissolved into most solvents, particularly into water over a wide range of pH. The copolymer also revealed a lower critical solution temperature (LCST) phenomenon at 32.6 degrees C in water; i.e., it was soluble in cold water (below 32.6 degrees C) but insoluble in hot water (above 32.6 degrees C). As a result, in contrast to Co-TACAPc, the copolymer is able to serve as a homogeneous catalyst on oxidation of 2-mercaptoethanol below 31.0 degrees C and be recovered with increasing temperature due to its lower solubility above 31.0 degrees C.
Chen
Wenxing
W
Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China. chenwxg@yahoo.com.cn
Zhao
Baoyan
B
Pan
Yong
Y
Yao
Yuyuan
Y
Lu
Shenshui
S
Chen
Shiliang
S
Du
Lijuan
L