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Author Han, Sang Hun ♦ Park, Kyung Kyu ♦ Lee, Sang Ho
Source SpringerLink
Content type Text
Publisher Springer-Verlag
File Format PDF
Copyright Year ©2009
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Chemistry & allied sciences
Subject Keyword polymerization ♦ supercritical CO$_{2}$ ♦ macromonomer ♦ pressure effect ♦ mixing ♦ Polymer Sciences ♦ Soft and Granular Matter, Complex Fluids and Microfluidics ♦ Physical Chemistry ♦ Characterization and Evaluation of Materials ♦ Nanochemistry ♦ Nanotechnology
Abstract Using glycidyl methacrylate-linked poly(dimethylsiloxane), methyl methacrylate was polymerized in supercritical CO$_{2}$. The effects of CO$_{2}$ pressure, reaction time, and mixing on the yield, molecular weight, and molecular weight distribution (MWD) of the poly(methyl methacrylate) (PMMA) products were investigated. The shape, number average particle diameter, and particle size distribution (PSD) of the PMMA were characterized. Between 69 and 483 bar, the yield and molar mass of the PMMA products showed a trend of increasing with increasing CO$_{2}$ pressure. However, the yield leveled off at around 345 bar and the particle diameter of the PMMA increased until the pressure reached 345 bar and decreased thereafter. With increasing pressure, MWD became more uniform while PSD was unaffected. As the reaction time was extended at 207 bar, the particle diameter of PMMA decreased at 0.48 ± 0.03% AIBN, but increased at 0.25% AIBN. Mixing the reactant mixture increased the PMMA yield by 18.6% and 9.3% at 138 and 207 bar, respectively.
ISSN 15985032
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2013-03-16
Publisher Place Berlin, Heidelberg
e-ISSN 20927673
Journal Macromolecular Research
Volume Number 17
Issue Number 1
Page Count 7
Starting Page 51
Ending Page 57

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Source: SpringerLink