eprintid: 479
rev_number: 11
eprint_status: archive
userid: 7
dir: disk0/00/00/04/79
datestamp: 2011-12-19 14:38:54
lastmod: 2015-05-29 20:05:48
status_changed: 2011-12-19 14:38:54
type: report
metadata_visibility: show
item_issues_count: 0
creators_name: Carnie, S.
creators_name: White, L.
title: PVC autoclave model
ispublished: pub
subjects: materials
studygroups: misg12
companyname: ICI Engineering
full_text_status: public
abstract: The batch reaction of polyvinyl chloride (PVC) in a pressure autoclave is modelled by considering the various mechanisms for conversion from vinyl chloride monomer (VCM) to the polymer during the middle phase of the industrial process. A key step is to determine at what stage the droplets of VCM stop contracting because of the density difference between VCM and PVC - this is known as the 'freeze point'. A model is proposed that locates the freeze point as that point where the unfavourable energy due to wetting of the PVC by water is dominated by the energy required to compress the gel network inside the droplets. Preliminary investigations support this explanation and suggest avenues for further work. A corollary of this model is an explanation of the role of 'secondary granulating agents' in controlling the porosity of the final product.
date: 1995
citation:   Carnie, S. and White, L.  (1995) PVC autoclave model.  [Study Group Report]     
document_url: http://miis.maths.ox.ac.uk/miis/479/1/PVC-autoclave-model.pdf