NISCAIR Online Periodicals Repository

NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR)  >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.14 [2007] >
IJCT Vol.14(5) [September 2007] >


Title: Effect of monomer feed rate on the properties of copolymer butyl acrylate/vinyl acetate in semi-batch emulsion polymerization
Authors: Palma, M S A
Keywords: Co-polymerization
Vinyl acetate
Emulsion polymerization
Issue Date: Sep-2007
Publisher: CSIR
IPC CodeC08F2/00
Abstract: In this work, the effects of the pre-emulsion feed rate on the instantaneous and overall conversion, average particle diameter, particle size distribution, polymer particle concentration, polymerization rate, average number of radicals per particle, viscosity and coagulum of a 65 wt% total solid contents of butyl acrylate/vinyl acetate copolymer latexes during relevant emulsion polymerization over pre-emulsion feeding times of 1, 2, 3, 4 and 6 h were investigated. The temperature of reaction was maintained at 85ºC during the feed input and at 90ºC for 1 h after the end of the feed. The effect was quite significant for feeding times of 1 to 3 h and it was of minor significance for feeding times varying from 3 to 6 h for the conversion, average particle diameter and polymer particle concentration. The polymerization rate was influenced by the feeding time, while the particle size distribution was not affected by the feeding time. The viscosity and average number of radicals per particle exhibited a clear tendency of inversion at the critical feeding time of 3 h. The coagulum formation decreased with feeding time up to 4 h and increased drastically for 6 h.
Page(s): 515-522
ISSN: 0971–457X
Source:IJCT Vol.14(5) [September 2007]

Files in This Item:

File Description SizeFormat
IJCT 14(5) (2007) 515-522.pdf146 kBAdobe PDFView/Open
 Current Page Visits: 881 
Recommend this item

 

National Knowledge Resources Consortium |  NISCAIR Website |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2012 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 621865 since 06-Feb-2009  Last updated on 13-Nov-2014Webmaster: nopr@niscair.res.in