Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Synthesis and Properties of Aromatic Poly(ether-ether-ester)s having Flexible Side Chain

유연한 곁사슬을 갖는 방향족 Poly(ether-ether-ester)의 합성 및 성질

  • Bang, Moon-Soo (Division of Advanced Materials Engineering, Kongju National University)
  • 방문수 (공주대학교 신소재공학부)
  • Published : 2009.11.30
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Abstract

A series of wholly aromatic Poly(ether-ether-ester)s with flexible side chain was synthesized by direct polycondensation from ether linkaged triad diol and 2,5-dialkoxyterephthalic acid. The chemical structures and physical properties of these polymers were investigated by using $^1H$-NMR, FT-IR, DSC and TGA. As results of investigations, the inherent viscosities($\eta$inh) measured at $40^{\circ}C$ in 1,1,2,2-tetrachloroethane(TCE) were 0.45~0.86 dl/g and initial decomposition(Td) in TGA occurred at 378~418 $^{\circ}C$ in N2 gas. The majority of these polymers were soluble in organic solvents used in this experiments at elevated temperatures. Melting temperatures(Tm) decreased with increasing the length of the side chain and showed odd-even effects.

알콕시 곁사슬을 갖는 유연한 곁사슬을 갖는 전방향족 Poly(ether-ether-ester)가 ether기로 연결된 triad diol과 2,5-dialkoxyterephthalic acid로부터 direct polycondensation에 의하여 합성되었다. 중합체의 구조와 물리적 성질은 1H-NMR, FT-IR, DSC, TGA를 이용하여 조사되었다. 연구결과에 의하면, 용매로서 1,1,2,2-tetrachloroethane(TCE)를 사용하여 측정된 고분자의 고유점성도는 0.45~0.86 이/g의 값을 나타내었으며, 질소 분위기하에서 측정된 초기열분해온도는 378~418 $^{\circ}C$를 나타내었다. 중합체 대부분은 측정에 사용된 유기용매에 용해되었고, 용융전이온도(Tm)는 곁사슬의 길이가 길수록 감소되었으며 홀수-짝수 효과를 나타내었다.

Keywords

References

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  1. Effects of Alkoxy Side Chain on the Properties of Wholly Aromatic Liquid Crystalline Polyesters with Biphenylene Units vol.11, pp.10, 2010, https://doi.org/10.5762/KAIS.2010.11.10.4041
  2. Synthesis and Properties of Liquid Crystalline Copolymers with Ether-ether-ester Linkage in Main Chain vol.11, pp.4, 2010, https://doi.org/10.5762/KAIS.2010.11.4.1367