Effect of fatty acid esters of hydroxyl-terminal hyperbranched polyester on performance of nylon 6/glass fiber reinforced composites
Due to the inherent differences in properties between glass fibers and nylon,the weak interfacial interactions result in low mechanical properties and rough surfaces of the composite materials of them.In this study,fatty acid esters of hydroxyl-terminal hyperbranched polyester with different fatty acid chain lengths(H24-n,n=8,12,16,18)were synthesized using fatty acid and hydroxyl-terminal hyperbranched polyesters(H24),to prepare nylon 6/glass fiber composites.The structure and molecular weight of the polymers were characterized using Fourier transform infrared spectroscopy,1H nuclear magnetic resonance spectroscopy and gel permeation chromatography.The influence of fatty acid chain length of H24-n on the mechanical,processing and thermal properties of nylon 6/glass fiber composites was systematically investigated.The performance of composites was improved with the increase of terminal fatty acid chain length of H24-n,and the flow properties of the composites increased with the increase of H24-18 content,while their mechanical properties increased firstly and then decreased.The melt index,tensile strength,flexural strength and impact strength of the composites with H24-18 mass fraction of 0.9%were improved by 73.04%,14.53%,5.60%and 9.71%,respectively,compared with those of nylon 6/glass fiber composites.The improving mechanism of H24-n in the composites was analyzed by scanning electron microscopy and differential scanning calorimetry.
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