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N ‐Isopropylacrylamide and N ‐Isopropylmethacryl‐amide: Cloud Points of Mixtures and Copolymers
Author(s) -
Djokpé Esther,
Vogt Walter
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010301)202:5<750::aid-macp750>3.0.co;2-8
Subject(s) - cloud point , copolymer , poly(n isopropylacrylamide) , aqueous solution , ternary operation , polymer chemistry , lower critical solution temperature , materials science , ternary numeral system , chemical engineering , chemistry , thermodynamics , polymer , physics , composite material , computer science , engineering , programming language
The cloud point curve of aqueous solutions of poly( N ‐isopropylacrylamide), poly( N ‐isopropylmethacrylamide) and their statistical copolymers were determined turbidimetrically. All the Systems demix upon heating at the cloud point temperature and mix reversibly upon cooling. The cloud points are independent of the total concentration of the solutions (dilute range) and of the sample thickness. Mixtures of the homopolymers poly( N ‐isopropylacrylamide) and poly( N ‐isopropylmethacrylamide) in water (ternary systems) exhibit two cloud points, which are nearly the same as the cloud points of the two binary systems homopolymer/water. A quantitative correlation was found between the cloud point temperatures of copolymers of N ‐isopropylacrylamide and N ‐isopropylmethacrylamide and the composition of the latter.