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Preparation of poly(vinyl acetate) microspheres with narrow particle size distributions by low temperature suspension polymerization of vinyl acetate
Author(s) -
Lee Se Geun,
Kim Jae Pil,
Kwon Ick Chan,
Shin Dong Soo,
Han Sung Soo,
Lyoo Won Seok
Publication year - 2006
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.23242
Subject(s) - vinyl acetate , polymerization , suspension polymerization , polymer chemistry , polyvinyl acetate , materials science , emulsion polymerization , suspension (topology) , monomer , particle size , particle (ecology) , chemical engineering , bulk polymerization , radical polymerization , polymer , composite material , copolymer , oceanography , mathematics , homotopy , pure mathematics , engineering , geology
To estimate influences of suspension polymerization conditions including conversion, polymerization temperature, stirring rate, initiator concentration, monomer concentration, and suspending agent concentration on the volume average diameter ( D avg ) and particle size distribution (PSD) of poly(vinyl acetate) (PVAc) microspheres, vinyl acetate (VAc) was suspension‐polymerized at low temperature using 2,2′‐azobis(2,4‐dimethylvaleronitrile) as an initiator. The effects of each condition, on D avg of PVAc microspheres, were expressed as follows, D avg = [conversion] a [temperature] b [rpm] c [ADMVN] d [VAc] f [suspending agent] g . Logarithms of D avg were linearly proportional to those of polymerization conditions, and their exponents, a , b , c , d , f , and g were calculated as 0.27, −13.7, −1.37, −0.21, 0.58, and 0.29, respectively. Variations of PSDs, according to polymerization conditions, were examined by considering polymerization rate, droplet or suspension viscosity, and droplet break‐up/coagulation equilibrium. From these results, PVAc microspheres with various sizes and narrow PSDs were obtained effectively under carefully controlled polymerization conditions, which can be used as promising precursors of novel PVA microspheres through heterogeneous surface saponification. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 4064–4070, 2006