Journal
POLYMER DEGRADATION AND STABILITY
Volume 96, Issue 9, Pages 1669-1675Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2011.06.012
Keywords
Flame retardance; Poly(lactic acid); Chain-extension; Phosphorus
Categories
Funding
- National Science Foundation of China [50933005]
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The molecular design for inherently flame-retardant poly(lactic acid) (IFR-PLA) was outlined and achieved by chemically incorporating an effective organophophorus-type flame retardant (FR) into the PLA backbone via the chain extension of the dihydroxyl-terminated prepolymer with 1, 6-hexamethylene diisocyanate (HDI). The structure of IFR-PLA was characterized by H-1- and P-31-nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectroscopy. IFR-PLA was further blended with the commercial PLA to prepare flame retardant PEA blends (PLA-FR blend). The relevant properties of IFR-PLA and PLA-FR blends were evaluated by differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA), limiting oxygen index (LOI) measurements and UL-94 tests. The thermal analysis revealed that the char yield of IFR-PLA and PEA-FR blend above 400 degrees C was greatly enhanced compared to that of pure PLA. The LOI value was significantly improved from 19 for pure PIA to 29 when 1 wt% of phosphorus content was introduced and all IFR-PLA samples achieved V-0 rating in the UL-94 tests. PEA-FR blends had an LOI value of 25-26 and UL-94 V-2 rating at 20 wt% of IFR-PLA content. The tensile strength of all the FR PLA systems was ca. 60 MPa. The method used in this study provided a novel route to permanently flame retard PEA. (C) 2011 Elsevier Ltd. All rights reserved.
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