Thermoplastic Composites with Reduced Discoloration and Enhanced Fire-Retardant Property
This paper discusses a light-weight reinforced thermoplastic (LWRT) composite with superior fire retardancy. This porous LWRT composite is manufactured using polyolefin, fiberglass, and fire retardant additives via a wet-lay process. However, discoloration of the LWRT can be induced by various mechanisms, which may be a concern in the building and construction industry. It is commonly understood that discoloration is strongly associated with the presence of phenolic antioxidant(s) and NOx. The over-oxidation of phenolic antioxidant(s) is probably the root-cause of the discoloration (pinking/yellowing). Hanwha Azdel, Inc. developed a LWRT with fire-retardant property of ASTM E84-Class A specification, as well as negligible discoloration even under harsh conditions. In addition, this thermoplastic material is suitable for secondary processing (e.g. compression molding) if necessary.
 F. M. AL-Oqla and M. S. Salit, “Materials selection for natural fiber composites,” Cambridge: Elsevier Ltd., 2017.
 R. Bon and R. Pietroforte, “New construction versus maintenance and repair construction technology in the US since World War II,” Construction Management and Economics, vol. 11, pp. 151-162, May 1992.
 B. T. Good, T. A. Ebeling, D. S. Woodman, J. J. McHugh, H. A. Jerri, and P. L. Wallace, “Fiber-reinforced thermoplastic composite material,” US Patent 0196637, Aug. 2007.
 R. Wang, “Self-extinguishing light weight reinforced thermoplastic composite,” Society of Plastics Engineers, Automotive Composites Conference & Exhibition, pp. 1-6, Sep. 2016.
 AATCC Test Method 23-2015, “Colorfastness to burnt gas fumes,” American Association of Textile Chemists and Colorists, Jan. 2015.
 R. S. Hunter and R. W. Harold, “The measurement of appearance” 2nd ed. New York: JohnWiley and Sons, Inc., 1987.
 ASTM E84-19b, “Standard test method for surface burning characteristics of building materials,” ASTM International, West Conshohocken, PA, 2019.
 L. Wei and L. Scott, “Poly-coated paper laminated onto light weight reinforced thermoplastic composite panel via in-line lamination,” In proceeding of CAMX – The Composites and Advanced Materials Expo, Dallas, TX, Oct. 2018.
 I. Vulic, G. Vitarelli, and J. M. Zenner, “Stucture-property relationships: phenolic antioxidants with high efficiency and low colour contribution,” Polymer Degradation and Stability, vol. 78, pp. 27-34. Mar. 2002.
 P. Patel, T. R. Hull, A. A. Stec., and R. E. Lyon, “Influence of physical properties on polymer flammability in the cone calorimeter,” Polymers for Advanced Technologies, vol. 22, pp. 1100-1107, Mar. 2011.