Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 138, Issue 13, Pages -Publisher
WILEY
DOI: 10.1002/app.50116
Keywords
ethylene‐ propylene‐ diene monomer; inorganic particles; intumescent flame retardant; polypropylene
Categories
Funding
- Joint Research Program of Guizhou Province [20177251]
- Fundamental Research Key Project of Guizhou Province [20201Z044]
- Guizhou Science Fund for Excellent Young Scholars [20195665]
- International Science and Technology Cooperation Project of Chengdu [2017-GH02-00051-HZ, 2019-GH02-00026-HZ]
- Natural Science Research Project of Guizhou Department of Education [[2019] 068]
- Opening Project of State Key Laboratory of Polymer Materials Engineering (Sichuan University) [sklpme2020-4-01]
- Science and Technology Project of Guizhou [2016/5667]
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The study found that in EPDM/PP/IFR composites, the synergistic effect of ZB and EG with IFR is better than OMMT. The addition of inorganic particles improves the thermal stability of the composites and forms dense char layers. Additionally, composites with inorganic particles exhibit more rubber-filler interaction, restricting the movement of rubber chains.
Three kinds of inorganic particles, zinc borate (ZB), organic montmorillonite (OMMT), and expanded graphite (EG) as synergistic flame retardants, are incorporated into ethylene-propylene-diene monomer/polypropylene (EPDM/PP) composites filled with intumescent flame retardants (IFR). The effect of three synergistic flame retardants on the combustion, thermal stability, and mechanical properties of the EPDM/PP/IFR composites are investigated by limiting oxygen index (LOI), UL-94 test, cone calorimeter test (CCT), thermogravimetric analysis (TGA), scanning electron microscopy, mechanical property testing, and dynamic mechanical analysis (DMA). The results from LOI, UL-94, and CCT show that the synergistic effect of IFR with ZB and EG is better than IFR with OMMT in the flame retardant EPDM/PP/IFR composites. The TGA results indicate that the thermal stability and char residues of the composites is improved with the addition of inorganic particles, which is attributed to the formation of dense char layers to isolate heat flow. DMA results including storage modulus (G'), loss modulus (G), and loss factor (tan delta) suggest that the composites with inorganic particles exhibit more rubber-filler interaction, which limits the movement of the rubber chains.
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