Thermal properties and flame retardance of Al(OH)₃/polypropylene composites modified by polypropylene grafting with acrylic acid

Abstract

ABSTRACT:The effect of polypropylene grafting with acrylic acid, PP-g-AA (FPP), on crystallization and melting behavior, thermal degradation, and limiting oxygen index of Al(OH) 3 /PP composites were investigated. The results indicated that crystallization temperature of PP shifted to high temperature with increasing content of Al(OH) 3 because of the interfacial heterogeneous nucleation of Al(OH) 3 and further increased by the addition of FPP and with increasing FPP content because of the improvement of the dispersion of Al(OH) 3 in PP matrix and the increase in the nucleating sites of Al(OH) 3 . With adding Al(OH) 3 and increasing the content of Al(OH) 3 , limiting oxygen index values of composites increased and further improved by adding FPP. This is attributed to the presence of an interfacial interaction between FPP and Al(OH) 3 .

Study on the Graft Reaction of Poly(propylene) Fiber with Acrylic Acid

“…Therefore, chemical modification technologies have been used to modify or improve the surface properties of PP fiber. Among them, surface graft modification through free radical polymerization technique is one of the most commonly used methods,3–7 and methacrylic acid (MAA), methacrylamide (MAAm), acrylamide (AAm), and 2‐hydroxyethyl methacrylate (HEMA) are taken as grafting monomer for modification of PP 8–25. However, one major limitation for this method is that the grafting degree is rather low because a large quantity of homopolymers come into being as side products in the reaction.…”

Physical and mechanical properties of nano-CaCO3/PP composites modified with acrylic acid

“…[35][36][37][38][39][40][41] The experiments showed that the general properties of Al(OH) 3 /PP and Mg(OH) 2 /PP composites modified by functionalised PP (FPP) or acrylic acid were better than those of unmodified composites.…”

Physical and mechanical properties of Al(OH)3/polypropylene composites modified by in situ‐functionalized polypropylene

“…The addition of AA and DCP had little influence on the LOI of the Al(OH) 3 /PP composite, which may be due to the better dispersion of the filler in the Al(OH) 3 /PP composites prepared by powdered PP. The LOI of the Al(OH) 3 /PP composites modified by in situ FPP was also found to be higher than that of the composites modified by the addition of FPP 33. The interfacial interaction and the filler dispersion appeared to be more significantly improved in composites modified by in situ FPP than by the addition of FPP, resulting in enhanced mechanical properties and flame retardance of the Al(OH) 3 /PP composites.…”

“…Studies have shown that the addition of a functionalized polymer is an effective method for the modification of the compatibility of immiscible polymer blends and interfacial adhesion in polymeric composites 8–31. In our laboratory,32–34 PP functionalized with acrylic acid (AA) was prepared by the melt‐extrusion process and the effect of PP‐ g ‐AA (FPP) on the structure and physical and mechanical properties of Al(OH) 3 /PP composites was investigated. The experimental results indicated that the addition of FPP led to an increase in the melt‐flow index, flame retardance, and mechanical properties.…”