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The inverse emulsion polymerization of acrylamide with pentaerythritolmyristate as emulsifier. 1. Experimental studies
Author(s) -
Pross Alexander,
Platkowski Kristina,
Reichert KarlHeinz
Publication year - 1998
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199801)45:1<22::aid-oi905>3.0.co;2-2
Subject(s) - emulsion polymerization , polymerization , molar mass , radical polymerization , polymer chemistry , emulsion , chemical engineering , polymer , bulk polymerization , materials science , acrylamide , chemistry , organic chemistry , monomer , engineering
The inverse emulsion polymerization of aqueous acrylamide solutions in isooctane as dispersing media with the emulsifier pentaerythritolmyristate and an oil‐soluble azo initiator was studied, particularly with respect to the influence of the chemically pure emulsifier. In this free radical polymerization, a water‐in‐oil emulsion with droplet sizes around 10μm is converted into a latex with average particle diameters between 80 and 200nm containing a polymer with molar masses up to 16×10 6 gmol ‐1 Kinetic data were measured by adiabatic as well as by isothermal calorimetry. The influences of various parameters on polymerization kinetics, particle numbers and molar mass averages were studied. Experimental results show a positive influence of the emulsifier concentration on the reaction rate and indicate the dominance of a bimolecular termination re‐action with respect to the polymer radicals above a certain initiator concentration. © 1998 SCI.