?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F479%2F&rft.title=PVC+autoclave+model&rft.creator=Carnie%2C+S.&rft.creator=White%2C+L.&rft.subject=Materials&rft.description=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.&rft.date=1995&rft.type=Study+Group+Report&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F479%2F1%2FPVC-autoclave-model.pdf&rft.identifier=++Carnie%2C+S.+and+White%2C+L.++(1995)+PVC+autoclave+model.++%5BStudy+Group+Report%5D+++++