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Mechanism of microemulsion polymerization of methyl methacrylate: Experimental evidence
Author(s) -
Roy Santanu,
Devi Surekha
Publication year - 1996
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/(sici)1097-4628(19961205)62:10<1509::aid-app3>3.0.co;2-s
Subject(s) - microemulsion , emulsion polymerization , methyl methacrylate , polymerization , materials science , polymer chemistry , polymer , radical polymerization , poly(methyl methacrylate) , chemical engineering , emulsion , chemistry , organic chemistry , pulmonary surfactant , composite material , engineering
Free radical polymerization of methyl methacrylate in emulsion and microemulsion media was studied for the understanding of the mechanism of the polymerization process. Average particle size of the poly(methyl methacrylate) (PMMA) latex formed during microemulsion polymerization was observed to be ≈ 45 nm. Nuclear magnetic resonance data indicated a larger number of interactions for β‐methylene protons of PMMA synthesized in microemulsion, indicating dominant isotaciticity in the polymer. Activation energy of degradation of the products was calculated by Broido's method and was found to be 44.70 kJ/mol and 65.47 kJ/mol for PMMA synthesized from microemulsion and emulsion media, respectively. Solution properties of the above polymers were also studied. Intramolecular expansion factors indicate a more rigid structure for PMMA synthesized from microemulsion medium. © 1996 John Wiley & Sons, Inc.