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Download filePlasticization of poly(vinyl chloride): PVC/plasticizer compatibility and its relationship with processing and properties of plasticized PVC
thesis
posted on 2010-10-18, 10:53 authored by Luis F. Ramos-deValleThe compatibility of suspension PVC with a series
of twelve different plasticizers was determined using
the estimated values of compatibility predictors, such
as the Hildebrand solubility parameter, as well as
actual measurements of compatibility, such as the
solid-gel transition temperature and the Flory-Huggins
interaction parameter. Different relative orders of
compatibility were obtained between the plasticizers
studied using the two different approaches.
Then, using the twelve different plasticized PVC
compounds, the ease of fusion during processing
(Brabender mixing and compression moulding) was
evaluated and found to be closely related to the
PVC/plasticizer compatibility. It was found that the
more compatible the plasticizer, the more rapid the
fusion during processing, but the higher the torque
peak during Brabender mixing. It was also found that
the temperature at the fusion peak in a Brabender
torque rheometer is closely related to the various
parameters used to measure the compatibility, (e.g. the
solid-gel transition temperature, the interaction
parameter, and the activity parameter). Finally, the
rheological and tensile properties of plasticized PVC
were determined and it was found that both the
rheological and tensile behaviour are highly dependent
on the level of fusion of the PVC compound, which in
turn depends on the plasticizer type. However, once a
high level of fusion is attained, these properties
depend more on the viscosity of the plasticizer and the
glass transition temperature of the compound.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Materials
Publisher
© Luis Francisco Ramos-deVallePublication date
1988Notes
A Doctoral Thesis. Submitted in partial fulfillment of the requirements for the award of Doctor of Philosophy of Loughborough University.EThOS Persistent ID
uk.bl.ethos.235124Language
- en