By Nicholas P. Cheremisinoff
This quantity covers complex polymer processing operations and is designed to supply an outline of a few of the most recent advancements for special items and fabrication tools. individuals for this quantity are from either and academia from the foreign neighborhood. This ebook comprises 9 chapters masking complicated processing purposes and applied sciences.
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Additional info for Advanced Polymer Processing Operations
PVC is fundamentally unstable to heat and light and loses hydrogen chloride by an autocatalytic reaction. HCl formation during degradation plays a catalytic role in PVC thermal degradation and it also causes corrosion problems. The PVC chain also contains fragments of initiators emulsifying or suspending agents or other polymerization recipe ingredients as end-groups. End-groups may also be formed as a result of terminating reactions. PVC is not hygroscopic and therefore normally does not absorb moisture.
Processing aids do not reduce melt viscosity, they improve the elastic behavior of the melt. These additives are characterized by a high level of compatibility with PVC and much higher molecular weights than PVC, therefore these long chains tend to bind together the PVC melt structure thus increasing the extensibility of the melt. They can also produce faster plastication. The effect of processing aids on PVC is reviewed (35). Processing aids are usually copolymers of metbylmetacrylate and other acrylates.
Jang, Polym. Composites, 15 (1994) 488. Processing of PVC Tiilin Bilgif Petkim Petrochemicals PROPERTIES Research Center; Turkey OF PVC General Properties Commercial PVC is generally produced by addition polymerization. It may be produced by a variety of techniques such as suspension, emulsion, micro suspension and bulk. 8 g/cc. Emulsion type PVC is usually smaller in particle size. This type of PVC is also called dispersion type. Dispersion type PVC is grounded to further decrease particle size and this type of PVC is called paste type.