Issue 2, 2017

Particle activation/deactivation effect in RAFT emulsion polymerization of styrene

Abstract

The seeded RAFT emulsion polymerization of styrene at low initiator concentrations was modelled using population balance equations and Monte Carlo simulations. Without any adjusting parameter, the models accurately predicted the polymerization kinetics, particle size, particle size distribution (PSD), and the characteristic changing trend of molecular weight distribution (MWD) at various initiator concentrations. An initiator concentration-dependent particle activation/deactivation process (PADeP), which played a decisive role in PSD and MWD at very low initiator concentrations, was highlighted to account for the unexpected simultaneous increase in the dispersities of PSD (PDIPS) and MWD (PDIMW) with the decrease of the initiator concentration. It was concluded that at low initiator concentrations, both PDIPS and PDIMW should be mappings of the dispersity of the number of PADeP experienced by particles during the whole polymerization course. The random nature of PADeP caused the dramatic increases in both PDIPS and PDIMW with the decrease of the initiator concentration. However, in the cases of higher initiator concentrations where the average number of PADeP was above 15, the effect of PADeP became much weaker. In such cases, PDIMW should be mainly controlled by the RAFT reaction.

Graphical abstract: Particle activation/deactivation effect in RAFT emulsion polymerization of styrene

Supplementary files

Article information

Article type
Paper
Submitted
19 Sept. 2016
Accepted
14 Nov. 2016
First published
06 Dec. 2016

React. Chem. Eng., 2017,2, 159-167

Particle activation/deactivation effect in RAFT emulsion polymerization of styrene

K. Yan and Y. Luo, React. Chem. Eng., 2017, 2, 159 DOI: 10.1039/C6RE00168H

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements