Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5192043 | Polymer | 2005 | 6 Pages |
Abstract
The influence of 1-pentanol (C5OH) on the ST emulsion polymerization mechanisms and kinetics is investigated. The CMC of the ST emulsions first decreases rapidly and then levels off when the C5OH concentration ([C5OH]) increases from 0 to 72Â mM. The effect of C5OH increases to a maximum and then decreases when the SDS concentration ([SDS]) increases from 2 to 18Â mM. At [SDS]=2Â mM, homogeneous nucleation controls the polymerization kinetics regardless of [C5OH]. At [SDS]=4Â mM, the effect of [C5OH] appears due to the transition from homogeneous nucleation to a mixed mode of particle nucleation (homogeneous nucleation and micellar nucleation) occurs when [C5OH] increases from 0 to 72Â mM. The effect of [C5OH] is the strongest at [SDS]=6Â mM since the particle nucleation mechanisms span homogeneous nucleation (low [C5OH]), a mixed mode of particle nucleation (homogeneous nucleation and micellar nucleation) (medium [C5OH]) and micellar nucleation (high [C5OH]). At [SDS] >6Â mM, in which micellar nucleation controls the polymerization kinetics, the effect of [C5OH] decreases rapidly with increasing [SDS].
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Chorng-Shyan Chern, Ting-Chuan Yu,