Journal
POLYMER DEGRADATION AND STABILITY
Volume 94, Issue 5, Pages 845-850Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2009.01.024
Keywords
Polyvinyl chloride (PVC); Calcium/zinc stabilizers; Lanthanum stearate; Co-stabilizer
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Funding
- Key Projects in the National Science & Technology Pillar Program [2007BAElOB04]
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Influence of lanthanum stearate (LaSt(3)) as a co-stabilizer on stabilization efficiency of calcium stearate (Ca)/zinc glutarate (Zn) stabilizers to polyvinyl chloride (PVC) at 180 degrees C in air was investigated. The results showed that combination of LaSt(3) with Ca/Zn stabilizers presented an obvious improvement of stabilization efficiency to PVC compared with the Ca/Zn stabilizers. Moreover, addition of LaSt(3) to the Ca/Zn stabilizers could significantly enhance static stability time of PVC. Incorporation of 2 phr LaSt(3) co-stabilizer to PVC containing 3 phr Ca/Zn stabilizers resulted in marked increase of onset degradation temperature and reductions in average degradation rate as well as the dynamic storage modulus (G') and loss modulus (G '') at 180 degrees C. Influence of Ca/Zn ratio on tensile strength of PVC in the absence or in the presence of LaSt(3) was discussed in detail. At low Ca/Zn ratios LaSt(3) had an obvious improvement in the tensile strength, while at high Ca/Zn ratios this effect became inconspicuous. (C) 2009 Published by Elsevier Ltd.
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