The effect of tertiary amines on the free radical copolymerization of unsaturated polyester and styrene


Ozeroglu C.

POLYMER-PLASTICS TECHNOLOGY AND ENGINEERING, vol.43, no.3, pp.661-670, 2004 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 43 Issue: 3
  • Publication Date: 2004
  • Doi Number: 10.1081/ppt-120038057
  • Journal Name: POLYMER-PLASTICS TECHNOLOGY AND ENGINEERING
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.661-670

Abstract

This article gives a discussion of the accelerating effects of tertiary amines in hardening unsaturated polyester. For this purpose, by using 2-methyl-1,3-propandiol, terephthalic acid, and maleic anhydride, an unsaturated polyester polymer was synthesized in a pilot reactor with a heater control. Stannous oxalate was used as an esterification catalyst. The polymer was dissolved in styrene containing a small part of hydroquinone. Cobalt octoate in toluene (1% m/m of Co) or and tertiary amines such as (DMA), (DMPT), (DHEPT), (PTDEA), and (TMEDA) were evaluated as curing reaction promotors or copromotors for the unsaturated polyester resin by using 1% methyl ethyl ketone peroxide (MEKp, Butanox M60). The increase of cobalt concentration for curing 100 g of unsaturated polyester resin by using 1 mL MEKp reduced gel time and curing time but increased peak exotherm temperature. Tertiary amine promotors, at a constant 1% MEKp and 0.5% cobalt solution catalyst system, were evaluated for efficiency as indicated by decreased gel and cure times: DMPA > DMA much greater than DHEPT > PTDEA greater than or equal to TMEDA.