Modification of nylon-6 with semi-or wholly-aromatic polyamides |
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Authors: | Huei-Hsiung Wang Ming-Fung Lin |
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Affiliation: | (1) Department of Textile Engineering, Feng Chia University, Taichung, 40710, Taiwan, ROC |
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Abstract: | In this study, flexible Nylon-6 was reinforced by semi-or wholly-aromatic polyamides; poly(m-phenylene isophthalamide) (PmIA), poly(4,4′-diphenylmethane terephthalamide) (PMA), and poly(4,4′-diphenylsulfone terephthalamide)
(PSA). Various high molecular weight block copolyamides were synthesized by solution polymerization using p-aminophenylacetic acid (p-APA) as a coupling agent. Their thermal properties have shown that the block copolyamides exhibit higher Tg and Tm, and better thermal stability than those of Nylon-6, especially PmIA modified Nylon-6. The order of their thermal properties
of aromatic modified Nylon-6 copolyamides is PmIA > PMA > PSA. Moreover, the Tg and Tm of multiblock copolyamides are higher than those of triblock copolyamides. From the wide-angle X-ray diffraction pattern,
it is found that the triblock copolyamides have two diffraction peaks, i.e., 2θ = 20.5° and 24°. However, the multiblock has
only one peak at 2θ = 20°, indicating a different crystal structure for multiblock copolyamides. For the mechanical properties,
it is found that the multiblock copolyamides have a more significant reinforcing effect than the triblock copolyamides. Also,
the order of the physical properties of aromatic modified Nylon-6 copolyamides, such as tensile strength, is PmIA > PMA >
PSA, but for the elongation PSA > PMA > PmIA. |
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Keywords: | Aromatic polyamide Nylon-6 Poly(m-phenylene isophthalamide) Poly(4 4′ -diphenylmethane terephthalamide) Poly(4 4′ -diphenylsulfone terephthalamide) |
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