Effect of processing parameters on fusion and mechanical properties of a twin‐screw extruded rigid PVC pipe
ABSTRACT The effect of varying mass temperature and screw speed on the fusion level and mechanical properties of a rigid PVC pipe produced by a twin-screw extruder has been investigated. Differential Scanning Calorimetry (DSC) and capillary rheometry have been used to determine pipe fusion levels. While yield stress was shown to be completely insensitive to fusion level, a very distinct maximum of falling weight and notched Charpy impact strengths and elongation at break was observed at moderate fusion level. Short-term burst strength values increased with degree of fusion while hydrostatic internal pressure tests revealed optimum resistance for pipes of varying fusion level. The effect of processing temperature on fusion in the Brabender Plasticorder was also examined.
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ABSTRACT: The effects of varying amounts of organically modified nanoclay (NC), calcium stearate (Ca.St.), stearic acid (St.Ac.), and an impact modifier (IM) on the fusion characteristics of a rigid Poly(vinyl chloride) (PVC) nanocompound were investigated by using the L9 orthogonal method of experimental design. The materials showed varying effects on the fusion parameters. Thus, while the fusion time was lowered and the fusion factor increased by NC, Ca.St., and IM, the reverse was true with St.Ac. Effects on the minimum and maximum viscosities of formulations also varied with material type. The behavior of the materials is discussed in terms of their effects on the transformation of PVC grains. Thermal stability and color change were sensitive to NC content. J. VINYL ADDIT. TECHNOL., 2009. © 2009 Society of Plastics EngineersJournal of Vinyl and Additive Technology 04/2009; 15(2):92 - 98. · 1.11 Impact Factor
- Polymer International 12/2009; 59(5):648 - 657. · 2.13 Impact Factor
- Journal of Vinyl & Additive Technology - J VINYL ADDITIVE TECHNOL. 01/2008; 14(2):73-78.