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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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Two kinds of semi-aromatic polyamide terpolymers based on the isomorphic replacement copolymer system of poly(hexamethylene adipamide-co-hexamethylene terephthalamide) (PA 66/6T), that is, poly(hexamethylene adipamide-co-hexamethylene terephthalamide-co-hexamethylene sebacamide) (PA 66/6T/610) and poly(hexamethylene adipamide-co-hexamethylene terephthalamide-co-hexamethylene isophthalamide) (PA 66/6T/6I), were synthesized by melt polycondensation in order to study the effect of comonomer structure on the properties of terpolyamides. Although the incorporation of the 610 or 6I in the PA terpolymers led to overall depression in the thermal properties of terpolymers, PA 66/6T/610 exhibited noticeably higher thermal properties such as melting point ($T_m$), heat of fusion (${\Delta}H_m$), and tensile mechanical performances as well as lower water absorption than those of PA 66/6T/6I. The lower water absorption might be originated from the enhanced chain mobility and the lower density of amide bond owing to the long aliphatic chain of the sebacic acid. On the other hand, the glass transition temperatures ($T_g$) of PA 66/6T/6I copolymers increased with the increment of the 6I content, which was resulted from the reduced chain mobility due to the rigid aromatic structure of the comonomer.
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