By Nicholas P. Cheremisinoff
This quantity covers complicated polymer processing operations and is designed to supply an outline of a few of the newest advancements for targeted items and fabrication tools. individuals for this quantity are from either and academia from the foreign neighborhood. This e-book includes 9 chapters protecting complicated processing purposes and applied sciences.
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Additional resources for Advanced Polymer Processing Operations
Degradation of PVC is accelerated by thermal heating, oxygen attack, UV radiation and mechanical shearing which also accelerates the process (38). Depending on their protecting mechanism stabilizers may be categorized into two groups,namely thermal and UV. Thermal Stabilizers There are mainly two types of stabilizers. Primary stabilizers are chemicals which are capable of reacting with labile structures and accept HCI to inhibit the initiation of degradation. Secondary stabilizers inhibit or reduce the degradation of PVC by accepting thermo-oxidative groups.
Reducing particle size also increases plasticizer up take rate. The fusion rate of non porous PVC particles are relatively higher than porous particles due to the low thermal conductivity of air inside the pores. Flow characteristics and bulk density of PVC is influenced by particle shape, size, distribution and porosity of particles. With spherical particles the bulk density increases as particle size and/or porosity decreases. 42 Advanced Polymer Processing Operations Molecular Weight The average molecular weight of PVC is usually expressed as viscosity number or K value.
The compatibility of plasticizer with PVC resin is also an important parameter in plasticizer selection (27). There are many ways in which plasticizers are incorporated into PVC. Dry blending, hot compounding, plastisol and solvent casting are more frequently used techniques. Hot compounding is usually applied to rigid PVC types, which involves the mixing of plasticizer resin and other additives in an intensive mixer followed by heating and fluxing in two- roll mixers. At the end of this process a fused gel called “crepe” is obtained.
Advanced Polymer Processing Operations by Nicholas P. Cheremisinoff