Picture of UK Houses of Parliament

Leading national thinking on politics, government & public policy through Open Access research

Strathprints makes available scholarly Open Access content by researchers in the School of Government & Public Policy, based within the Faculty of Humanities & Social Sciences.

Research here is 1st in Scotland for research intensity and spans a wide range of domains. The Department of Politics demonstrates expertise in understanding parties, elections and public opinion, with additional emphases on political economy, institutions and international relations. This international angle is reflected in the European Policies Research Centre (EPRC) which conducts comparative research on public policy. Meanwhile, the Centre for Energy Policy provides independent expertise on energy, working across multidisciplinary groups to shape policy for a low carbon economy.

Explore the Open Access research of the School of Government & Public Policy. Or explore all of Strathclyde's Open Access research...

Monitoring the progress of a branching polymethylmethacrylate reaction via online rapid gel permeation chromatography (GPC) analysis

Cormack, Peter (2006) Monitoring the progress of a branching polymethylmethacrylate reaction via online rapid gel permeation chromatography (GPC) analysis. In: Proceedings of the world polymer congress (MACRO2006), 41st international symposium on macromolecules. Wiley-VCH.

Full text not available in this repository.Request a copy from the Strathclyde author

Abstract

A new methodology has been developed for the one-pot synthesis of a branched polymethyl methacrylate material. Employing a cross-linking comonomer and large amount of a chain transfer agent, a fully soluble material is produced through a conventional free radical reaction. It is thought that despite the presence of the cross-linker, a network is not formed due to the high chain transfer agent concentration instead resulting in a soluble polymer with a highly branched structure. Branched polymers are of interest for their unusual flow and viscometric properties, and this material is particularly attractive due to the relatively cheap and simple synthetic route. To better understand the mechanism of the reaction, an online monitoring system, the PL-PMC, was used to monitor the contents of the reactor at near real time during the polymerisation. A continuous stream of sample from the reactor was diluted to an appropriated level and injected into a rapid GPC analysis system comprising a differential refractive index detector, an online viscometer and a short GPC column to allow measurements in a ‘flow injection analysis’ mode. Measurements of bulk molecular weight and intrinsic viscosity parameters were made during synthesis, allowing the growth of the polymer to be closely followed. From the intrinsic viscosity measurements, the development of the branched structure was investigated as a function of reaction time. The final product was then isolated and investigated by offline analytical multi detector GPC to complete the study. Combining the data from the online monitoring investigation and the offline analysis of the final product, considerable insights into the reaction process were obtained from a single reaction.