2-FLUID POLYMER COORDINATION SOLUTION THE ORY - EQUATION OF STATE FORPURE COMPONENTS AND ITS APPLICATIONS

A new model named polymer's two-fluid coordination thermodynamic stati stic model based on Flory's cell theory coupled with local composition is proposed, The hole similar to that in the Simha-Socmcynsky hole th eory is introduced and two concepts of site fraction and local site fr action in Flory's theory are replaced by coordination fraction and loc al coordination fraction, Quasi-chemical treatment is applied to calcu late the local coordination fraction, An equation of state of pure com ponents based on the new model is derived and the P-V-T properties of three systems [polystyrene, polypropylene and poly(1-betene)], were co rrelated by the new equation, The results were fine, According to the relation between segment structure of polymer and holes, we predict th at if polymers are similar to each other in structure, their holes and flow properties of melts decrease with the increase of size of subgro up of polymer's segment.