Room Temperature Initiated and Self-Heating Polymerization via Concentrated Emulsions: Application to Acrylonitrile Based Polymers

Authored by: Eli Ruckenstein , Hangquan Li

Concentrated Emulsion Polymerization

Print publication date:  April  2019
Online publication date:  March  2019

Print ISBN: 9780367134556
eBook ISBN: 9780429026577
Adobe ISBN:

10.1201/9780429026577-27

 Download Chapter

 

Abstract

A novel concentrated emulsion polymerization procedure, in which the polymerization is initiated at room temperature and the heat generated by the reaction accelerates the process, is proposed. The polymerization of acrylonitrile (AN) and its copolymerization with vinylidene chloride (VDC) are used as examples. AN (alone or with a comonomer) containing an oxidant was first dispersed in water to generate a concentrated emulsion. The polymerization of the monomers was initiated at room temperature by introducing an aqueous solution containing a mixture of reductants (ferrous sulfate and sodium metabisulfite) into the concentrated emulsion. The heat generated in the system increased its temperature and accelerated the polymerization. Under optimal conditions, the polymerization could reach >90% conversion within one hour. The small volume of the continuous phase in a concentrated emulsion constitutes an advantage of the procedure, since only a small amount of the produced heat is used for its heating. In addition, because the reductant, which is present in the water phase, together with the oxidant, which is present in the oil phase, constitute the initiator, the large oil-water interfacial area of the concentrated emulsion constitutes an additional advantage.

 Cite
Search for more...
Back to top

Use of cookies on this website

We are using cookies to provide statistics that help us give you the best experience of our site. You can find out more in our Privacy Policy. By continuing to use the site you are agreeing to our use of cookies.