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Titolo:
Studies on copolymerization of N-isopropylacrylamide and glycidyl methacrylate
Autore:
Virtanen, J; Tenhu, H;
Indirizzi:
Univ Helsinki, Polymer Chem Lab, FIN-00014 Helsinki, Finland Univ Helsinki Helsinki Finland FIN-00014 ab, FIN-00014 Helsinki, Finland
Titolo Testata:
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
fascicolo: 21, volume: 39, anno: 2001,
pagine: 3716 - 3725
SICI:
0887-624X(20011101)39:21<3716:SOCONA>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLUBLE ACRYLAMIDE COPOLYMERS; POLY(ETHYLENE OXIDE); METHYL-METHACRYLATE; THERMAL-PROPERTIES; LIGHT-SCATTERING; POLY(N-ISOPROPYLACRYLAMIDE); HYDROGELS; POLYMERS; BIOTECHNOLOGY; TRANSITION;
Keywords:
homopolymerization; copolymerization; N-isopropyl acrylamide; glycidyl methacrylate; Fineman-Ross method; extended Kelen-Tudos method; Markov distribution;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Tenhu, H Univ Helsinki, Polymer Chem Lab, PB 55, FIN-00014 Helsinki, Finland Univ Helsinki PB 55 Helsinki Finland FIN-00014 Helsinki, Finland
Citazione:
J. Virtanen e H. Tenhu, "Studies on copolymerization of N-isopropylacrylamide and glycidyl methacrylate", J POL SC PC, 39(21), 2001, pp. 3716-3725

Abstract

Free-radical homopolymerization of N-isopropyl acrylamide (NIPA, monomer 1) and copolymerizations of NIPA with glycidyl methacrylate (GMA, monomer 2)were conducted in deuterated dioxane at 70 degreesC. The conversion of themonomers was followed by H-1 NMR spectroscopy. After the polymerization reactions the polymers were precipitated and analyzed. Reactivity ratios weredetermined using both Fineman-Ross and extended Kelen-Tudos methods. Values obtained by these two methods were r(1) = 0.39, r(2) = 2.69 and r(1) = 0.30, r(2) = 2.66, respectively. In both cases, r(1r2) similar to 1, which isindicative of an ideal copolymerization resulting in a first-order Markov distribution of the monomers in the final copolymer. The compositional heterogeneities of the polymers were estimated by following the instantaneous copolymer compositions as functions of conversion. Given the different reactivities of the two monomers it is concluded that a copolymer with a homogeneous distribution of monomers may be obtained not by a batch reaction, but by slowly and continuously adding GAIA into the polymerizing reaction mixture. (C) 2001 John Wiley & Sons, Inc.

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Documento generato il 24/09/20 alle ore 09:18:46