Journal
POLYMER DEGRADATION AND STABILITY
Volume 95, Issue 5, Pages 763-770Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2010.02.011
Keywords
Polylactide; Hyperbranched polyamine charring agent; Synergistic effect; Flame retardancy; Anti-dripping effect
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Funding
- National Natural Science Foundation of China (NSFC) [20804056]
- Ningbo Natural Science Foundation of China [2009A610051]
- Science and Technology Department of Zhejiang Province [2008C11092-2]
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A novel hyperbranched polyamine charring agent (HPCA), a derivative of triazines, was synthesized and well characterized by H-1 NMR and FTIR. HPCA and ammonium polyphosphate (APP) were added into polylactide (PLA) resin as an intumescent flame retardant (IFR) system to impart flame retardancy and dripping resistance to PLA. The flammability and thermal stability of IFR-PLA composites were investigated by limiting oxygen index (LOI), UL-94 vertical burning, cone calorimetry and thermogravometric analysis (TGA) tests. The results showed that the IFR system had both excellent flame retardant and anti-dripping abilities for RA. The TGA curves suggested that HPCA has good ability of char formation and when combined with APP, would induce synergistic effect which could be clearly observed. This effect greatly promoted the char formation of IFR-PLA composites, hence improved the flame retardant property. Additionally, the structure and morphology of char residues were studied by XPS, FTIR and SEM. (C) 2010 Elsevier Ltd. All rights reserved.
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