Journal
JOURNAL OF MACROMOLECULAR SCIENCE PART B-PHYSICS
Volume 49, Issue 1, Pages 143-154Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00222340903346411
Keywords
elongation at break; intumescent fire retardant; mechanical properties; melt flowability; polypropylene; ultrafine full-vulcanized powdered rubber
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Funding
- National Natural Science Foundation commission of China [20874066]
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Ultrafine full-vulcanized powdered rubber (UFPR) was added into intumescent fire retardant polypropylene (IFR-PP) composites, and fire retardance, morphology, and properties of the composite were analyzed. Ammonium polyphosphate and pentaerythritol were used as the intumescent fire retardants (IFR). The mechanical properties (elongation at break increased from 70% to 110%) and the melt flowability of IFR-PP improved by adding a small quantity of UFPR (less than 0.5 phr) but decreased when the UFPR was more than 0.5 phr. At the same time, the fire retardance, as measured by the limiting oxygen index and the UL94 vertical test rating, and other mechanical properties decreased appreciably with adding UFPR. The reasons were analyzed by using SEM micrographs, and a model was proposed to explain the reasons.
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