Polyvinylchloride suspension

FIG. 23-23 Batch and continuous polymerizations, (a) Polyethylene in a tiihiilar flow reactor, up to 2 km long hy 6,4 cm ID, (h) Batch process for polystyrene, (c) Batch-continuous process for polystyrene, (d) Suspension (head) process for polyvinylchloride, (e) Emulsion process for polyvinylchloride, (Ray and Laurence, in Lapidus and Amundson, eds, Chemical Reactor Theory Review, Frentice-Hall, 1977. )... 

Transition from liquid behavior to solid behavior has been reported with fine particle suspensions with increased filler content in both Newtonian and non-Newtonian liquids. Industrially important classes are rubber-modified polymer melts (small rubber particles embedded in a polymer melt), e.g. ABS (acrylo-nitrile-butadiene-styrene) or HIPS (high-impact polystyrene) and fiber-reinforced polymers. Another interesting suspension is present in plasticized polyvinylchloride (PVC) at low temperatures, when suspended PVC particles are formed in the melt [96], The transition becomes evident in the following... 

Kiparissides, C., Daskalakis, G., Achilias, D. S., Sidiropoulou, E., Dynamic simulation of polyvinylchloride batch suspension polymerisation reactors, Ind. Eng. Chem. Res., 1997, 36, 1253-1267... 

Sample Materials. Vinnol H 60d. Vinnol Y 60, and Vinnol E 6Qg are commercial polyvinylchlorides from Wacker. produced by suspension, bulk, and emulsion polymerization techniques, respectively. All materials have nearly the same molecular weight distribution (MWD) as Solvlc 226 which, (with our SEC calibration) gave M = 74.000, M = 35,000. The samples used in this investigation in the Vinnol 60 series had molecular weights in the range M = 72,000 2000 and... 

On a technical scale, suspension polymerization is nsed in the prodnction of polyvinylchloride, polystyrene, polymethyl methacrylate, and others. For the production of rnbbery, sticky, polymers (e.g., the polyacrylates), this is less snitable. 

GRAFTING ON POLYVINYLCHLORIDE IN SUSPENSION USING PHASE TRANSFER CATALYSTS OR SOLVENTS... 

For polystyrene and polyvinylchloride (PVC), made by the suspension or emulsion processes, the reaction medium is an aqueous solution containing wetting agents, detergents, soaps and emulsifiers. Traces of all of these will occur in the final product. 

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