Kinetic and Thermodynamic Studies of Emulsion Polymerization of a Sugar Monomer by Calorimetry with Compensation Heating and Differential Cooling

✍ Scribed by Adrian Cosmin Dobre; Emile-Joseph Yaacoub; Adrian Schumpe

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 156 KB
• Volume: 288
• Category: Article
• ISSN: 1438-7492
• DOI: 10.1002/mame.200390049

✦ Synopsis

Abstract

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).

magnified imageRelationship between the activation energy and the conversion for BA (open symbols) and 3‐MDG (solid symbols).