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Synthesis of copolymers of N , N ‐dimethyl acrylamide and methacrylate esters and their surface tensions
Author(s) -
Weinert Raymond J.,
Piirma I.
Publication year - 1989
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/app.1989.070380907
Subject(s) - copolymer , polymer chemistry , methacrylate , solvent , acrylamide , methacrylic acid , surface tension , chemistry , organic chemistry , polymer , physics , quantum mechanics
A systematic study was made on the preparation of N , N ‐dimethylacrylamide (NDMA)/ methacrylic ester statistical copolymers. The methacrylic ester comonomers used in the copolymerizations were ethyl, n ‐butyl, n ‐hexyl, n ‐octyl, n ‐dodecyl, n ‐hexadecyl, and n ‐octadecyl methacrylates. It was found that the NDMA copolymers could be prepared in three molecular weight regions: 1.0 × 10 4 , 2.0 × 10 5 , and greater than 1.0 × 10 6 ([η] in water at 30°C of 0.1, 0.6, and greater than 1.5 dL/g, respectively). The molecular weights of the copolymers were dependent on the solvent employed in the polymerizations and on the presence of a chain transfer agent ( t ‐dodecyl mercaptan). All copolymer compositional analyses were made by 400 MHz 1 H‐NMR spectroscopy. The NDMA/methacrylic ester copolymers decreased the surface tension of water in the order: C 4 = C 6 > C 8 > C 12 > C 16 > C 2 = C 18 > P(NDMA), lowest surface tension (35 dyn/cm) to highest surface tension (59 dyn/cm).