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Thermal Sensitivity of tert ‐Butyloxycarbonylmethyl‐Modified Polyquats in Condensed Phase and Solubility Properties of Copolymers with N ‐Isopropylacrylamide
Author(s) -
Gonsior Nina,
Schmitz Sarah,
Ritter Helmut
Publication year - 2010
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/macp.201000077
Subject(s) - lower critical solution temperature , copolymer , polymer chemistry , monomer , chemistry , thermal decomposition , polymerization , solvent , methacrylate , molar mass , cloud point , solubility , aqueous solution , polymer , organic chemistry
The synthesis of the easily decomposable ionic monomer 2‐ tert ‐butoxy‐ N ‐[2‐(methacryloyl‐oxy)ethyl]‐ N , N ‐dimethyl‐2‐oxoethanammonium chloride ( 3 ) via thermally induced syn‐elimination of a tert ‐butyl ester group was realized simply by mixing N , N ‐dimethylaminoethyl methacrylate ( 1 ) and tert ‐butyl chloroacetate ( 2 ) at ambient temperature without solvent. The obtained salt was polymerized via free radical polymerization. The decomposition and foaming via iso ‐butene formation takes place by heating up to about 160 °C. IR, DSC, TGA, and GC/MS measurements were performed to follow this pyrolysis reaction. Furthermore, the copolymerization of 3 with N ‐isopropylacrylamid (NiPAAm, 5 ) was carried out with different monomer ratios. Molar mass distributions were measured using an asymmetrical flow field‐flow fractionation (aFFFF) system. The obtained copolymers 6–10 exhibit lower critical solution temperature (LCST) behaviour in water with cloud points at different temperatures depending on the monomer ratio.