Analysis of Surfactant-Free Emulsion Polymerization Processes of Styrene and Methyl Methacrylate by the Light Scattering Method

A rapid angular-scanning light scattering photometer, which was developed previously in our laboratory, was employed to throw light on the process of polymer particle formation during surfactant-free emulsion polymerizations of styrene and methyl methacrylate. In most experiments, accumulation of sc...

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Bibliographic Details
Published in:KOBUNSHI RONBUNSHU 1993/05/25, Vol.50(5), pp.397-402
Main Authors: HASHIYA, Shigeo, TAKASHIMA, Yasutaka, MATSUO, Togoro
Format: Article
Language:eng ; jpn
Subjects:
Emulsion Polymerization
Guinier Plot
Light Scattering
Methyl Methacrylate
Particle Diameter
Particle Number
Real-Time Measurement
Styrene
Surfactant-Free
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Summary:A rapid angular-scanning light scattering photometer, which was developed previously in our laboratory, was employed to throw light on the process of polymer particle formation during surfactant-free emulsion polymerizations of styrene and methyl methacrylate. In most experiments, accumulation of scattering intensity data in the angular range from 20°to 160°was made at a rate of 2 seconds per scanning, allowing us to observe the particle formation process. It dependence of scattering intensity, which converts gradually with the further polymerization to expected angular dependence represented by the Guinier approximation. This suggests that concentration fluctuation of as-born polymer particles is considerable so as to give such large angular dependence of the scattering intensity. The particle diameter and number were calculated, using data beyond the early stage. The diameter increases and the number decreases with an increase in polymerization time, the both leveling off soon. Styrene and methyl methacrylate give finally similar particle numbers in the order of 1011/ml, irrespective of the initial concentration.
ISSN:0386-2186
1881-5685
DOI:10.1295/koron.50.397