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Temperature‐dependent permeability of polyelectrolyte complex capsule membranes having N ‐isopropylacrylamide domains
Author(s) -
Kono Kenji,
Okabe Hideki,
Morimoto Keiji,
Takagishi Toru
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/1097-4628(20000919)77:12<2703::aid-app180>3.0.co;2-p
Subject(s) - membrane , methacrylic acid , polymer chemistry , polyethylenimine , copolymer , polyelectrolyte , permeation , poly(n isopropylacrylamide) , materials science , swelling , capsule , differential scanning calorimetry , chemical engineering , chemistry , polymer , composite material , transfection , biochemistry , botany , thermodynamics , physics , biology , engineering , gene
As a microcapsule with temperature sensitivity, poly(methacrylic acid)–polyethylenimine complex capsules containing N ‐isopropylacrylamide units were designed. Two kinds of copolymers of methacrylic acid and N ‐isopropylacrylamide were synthesized by free‐radical copolymerization. Partly crosslinked poly(methacrylic acid)–polyethylenimine complex capsules containing the methacrylic acid– N ‐isopropylacrylamide copolymers were prepared at 40 or 25°C. The permeation of phenylethylene glycol through the capsule membranes was investigated. Permeability of the capsules prepared at 25°C increased monotonously with increasing temperature from 10 to 50°C. Permeability of the capsules prepared at 40°C also increased with increasing temperature up to 25°C but decreased above 30°C. Also, the degree of swelling of the membranes prepared at 40°C decreased above 30°C. Differential scanning calorimetry measurement showed that N ‐isopropylacrylamide units underwent more efficient transition in the capsule membranes prepared at 40°C than in the membranes prepared at 25°C. The capsule membranes prepared at 40°C might have domains in which N ‐isopropylacrylamide units are concentrated, whereas these units should distribute uniformly in the capsule membranes made at 25°C. Such a difference in distribution of N ‐isopropylacrylamide units might result in the different permeation property of the capsule membranes. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2703–2710, 2000