Journal
POLYMER DEGRADATION AND STABILITY
Volume 113, Issue -, Pages 46-54Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2015.01.016
Keywords
Layered double hydroxide; Poly(vinyl chloride); Heat stabiliser; Thermal analysis
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Funding
- THRIP programme of the Department of Trade and Industry [P2010072800070]
- National Research Foundation
- Greenfield Innovation
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The layered double hydroxide ([Mg0.667Al0.333(OH)(2)](CO3)(0.167).mH(2)O) (LDH) has found application as a heat stabiliser for PVC. Derivatives of this compound were synthesised using a hydrothermal method. Emulsion grade PVC was plasticised with 100 phr diisononyl phthalate and stabilised with 30 phr of the LDH filler additives. Heat stabilities were determined at 200 degrees C. The dynamic heat stability tests were performed on the plastisols using the torque rheometer method. Static heat stability was evaluated on the fused compounds. It was evaluated from discoloration profiles of strips exposed for various lengths of time to heat in a Metrastat oven. The time dependence of hydrogen chloride evolution was followed with a Metrohm Thermomat instrument. The conventional LDH provided the best dynamic heat stability. However, partial replacement of the magnesium with copper significantly delayed the release of volatile HCI. If instead the replacement was done using zinc, better colour retention was achieved. (C) 2015 Elsevier Ltd. All rights reserved.
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