2134/4230
David Hitt
David
Hitt
Barry Haworth
Barry
Haworth
Noreen Thomas
Noreen
Thomas
M.A. Algahtani
M.A.
Algahtani
Melt compounding of rigid PVC formulations with hydrotalcites
Loughborough University
2009
PVC
Hydrotalcite
Processing
Thermal stability
Mechanical properties
Materials Engineering not elsewhere classified
Mechanical Engineering
2009-02-13 14:10:59
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/Melt_compounding_of_rigid_PVC_formulations_with_hydrotalcites/9235700
Hydrotalcites, compounds of magnesium–aluminium–hydroxycarbonate, are promoted as
environmentally safe materials for costabilisation of PVC products. Commercial grades of
hydrotalcites have been added to rigid PVC formulations, containing a range of different stabiliser
types, to evaluate their contribution to heat stability and their effect on mechanical properties.
Hydrotalcites are confirmed to be effective costabilisers for rigid PVC: static thermal stability
(through oven testing) and dynamic thermal stability (via torque rheometry) of PVC compounds
are modified by their presence. The extent of change is determined by the primary stabiliser type
and the grade of the hydrotalcite. Detailed analysis of mechanical properties has been carried out
on compression moulded samples and on extruded compounds. With the former, no significant
change in tensile or impact performance was observed, for hydrotalcite levels up to 5 phr. Charpy
impact data on extruded PVC have shown significant increase in performance of compounds
containing an acrylate modifier when hydrotalcites are used.