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Kinetic and Thermodynamic Studies of Emulsion Polymerization of a Sugar Monomer by Calorimetry with Compensation Heating and Differential Cooling
Author(s) -
Dobre Adrian Cosmin,
Yaacoub EmileJoseph,
Schumpe Adrian
Publication year - 2003
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200390049
Subject(s) - materials science , polymerization , differential scanning calorimetry , emulsion polymerization , polymer chemistry , monomer , copolymer , enthalpy , activation energy , radical polymerization , bulk polymerization , thermodynamics , chemical engineering , polymer , chemistry , composite material , physics , engineering
The kinetic and thermodynamic features of free‐radical batch emulsion polymerization of a sugar monomer (3‐MDG) and butyl acrylate (BA) were investigated in a power compensation calorimeter. The homopolymerizations as well as the copolymerization have been studied. The overall activation energy of 3‐MDG homopolymerization was 140 ± 3.8 kJ · mol −1 , the polymerization enthalpy was Δ H MDG = −51.6 ± 1.9 kJ · mol −1 and the calculated adiabatic temperature rise was Δ T ad = 78.5 K. The effects of the initiator and the emulsifier concentrations on the 3‐MDG/BA batch copolymerization kinetics and on the colloidal properties of the final sugar latexes were studied at 60 °C. At higher emulsifier and initiator concentration, respectively, the polymerization rate increases and the particle size decreases, but the trends do not conform to the Smith‐Ewart theory. Polydisperse sugar latex particles with a mean diameter in the range of 50–67 nm were obtained.Relationship between the activation energy and the conversion for BA (open symbols) and 3‐MDG (solid symbols).