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Precipitation polymerization of methyl methacrylate in tetrahydrofuran with compressed CO 2 as antisolvent
Author(s) -
Xu Qun,
Han Buxing,
Yan Haike
Publication year - 2003
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.11978
Subject(s) - azobisisobutyronitrile , differential scanning calorimetry , materials science , polymer chemistry , polymerization , methyl methacrylate , tetrahydrofuran , glass transition , gel permeation chromatography , precipitation polymerization , poly(methyl methacrylate) , polymer , radical polymerization , chemical engineering , chemistry , composite material , organic chemistry , thermodynamics , solvent , physics , engineering
Abstract Precipitation polymerization of methyl methacrylate (MMA) in tetrahydrofuran (THF) with compressed CO 2 as an antisolvent was carried out at 335 K up to 8.5 MPa, and the decomposition rate of the initiator, 2,2′‐azobisisobutyronitrile (AIBN), was studied with UV/vis. Gel permeation chromatography (GPC) and differential scanning calorimetry (DSC) were used to determine the average molecular weights and glass transition temperature ( T g ), and scanning electron micrography (SEM) was used to observe the morphologies of the product. The results showed that the average molecular weights of the polymer vary considerably with the volume expansion of the solution induced by compressed CO 2 . © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2427–2433, 2003