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

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
권호 표지
DOI QR코드

DOI QR Code

Synthesis and Properties of Liquid Crystalline Copolymers with Ether-ether-ester Linkage in Main Chain

주사슬에 ether-ether-ester 결합을 갖는 액정공중합체의 합성 및 성질

  • Bang, Moon-Soo (Division of Advanced Materials Science and Engineering, Kongju National University)
  • 방문수 (공주대학교 신소재공학부)
  • Received : 2010.03.02
  • Accepted : 2010.04.09
  • Published : 2010.04.30
Download PDF
⟨ Previous Next ⟩

Abstract

Copoly(ether-ether-ester)s having flexible side chain were synthesized by polycondensation. Intrinsic viscosities of polymers were between 0.42 and 0.78dl/g in tetrachloroethane. The polymer structures were investigated by $^1H$-NMR and FT-IR, and thermal and liquid crystalline properties of polymers were measured by DSC, TGA, POM and XRD. As results of investigations, synthetic copolymers exhibited lower melting temperature than homopolymers. When the biphenylene units contents in copolymer were more than 60 mol %, nematic mesophase was observed, and the mesophase of synthetic polymers was dependent upon biphenylene content.

유연한 곁사슬을 가지고 있는 copoly(ether-ether-ester)가 중축합반응에 의하여 합성되었다. 테트라클로로에탄 중에서 측정된 중합체의 고유점성도 값은 0.42~0.78 dl/g을 나타내었다. 합성된 고분자의 구조는 $^1H$-NMR과 FT-IR에 의하여 조사되었으며, 열적성질과 액정성은 DSC, TGA, POM, XRD에 의하여 측정되었다. 조사된 결과에 의하면 합성된 공중합체들은 모두 단독중합체보다 낮은 용융전이온도를 나타내었으며, 공중합체 내의 비페닐렌 단위의 함량이 60 mol %이상일 때 네마틱액정상이 관찰되었으며, 합성된 중합체의 액정성은 비페닐렌 함량에 의존하였다.

Keywords

References

  1. T.-S. SHUNG, "The Recent Developments of Thermotropic Liquid Crystalline Polymers" J. Polym. Eng. & Sci., 26, 901-919, 1986. https://doi.org/10.1002/pen.760261302
  2. Y.-W. Kwon, D. H. Choi, and J.-I. Jin, "Liquid Crystalline Aromatic Polyesters" polymer(Korea), 29, 523-535, 2005.
  3. D.Y.Kim, "Main Chain Liquid Crystalline Polymers" Polymer Science and Technology, 2, 415-423, 1991.
  4. C. K. Ober, J.-I. Jin, and R. W. Lenz, "Liquid crystal polymers with flexible spacers in the main chain", Adv. Polym. Sci., 59, 103-146, 1984. https://doi.org/10.1007/3-540-12818-2_8
  5. L.L.Lin, and J.L.Hong, Semi-rigid thermotropic polyester containing a rigid, bent spirobicromane moieties-primary characterization and the thermal behavior", Polymer, 41, 4501-4512, 2000. https://doi.org/10.1016/S0032-3861(99)00668-0
  6. M.Bagheri, Kh.Didehban, Z. Rezvani, and A. Entezami, "Thermotropic polyester: Part 1. Synthesis, characterization and thermal transition of poly[4,4'-bis(${\omega}$$-alkoxy biphenyl isophthalate], Eur. Polym. J., 40, 865-871, 2004. https://doi.org/10.1016/j.eurpolymj.2003.11.026
  7. W.J.Jackson Jr., and H.F.Kuhfuss, "liquid crystal polymers. I. Preparation and properties of p-hydroxybenzoic acid copolyesters", J. Polym. Sci., Polym. Chem., 34, 3031-3046, 1975.
  8. M.S.Bang, "Synthesis and Properties of Aromatic Poly(ether-ether-ester)s having Flexible Side Chain" J. the Korean Academic Industrial Society, 10, 3060-3065, 2009. https://doi.org/10.5762/KAIS.2009.10.11.3060
  9. R.Cai and E.T.Samulski, "liquid crystals polyesters containing isophthalic acid", Macromolecules., 27,135-140, 1994. https://doi.org/10.1021/ma00079a020
  10. M.Ballauff, "Rigid rod polymers having flexible side chains, 1. thermotropic poly(1,4-phenylene 2,5- dialkoxyterephthalate)s", Makroml. Chem., Rapid Commun., 7, 407-414, 1986. https://doi.org/10.1002/marc.1986.030070615
  11. A.H.Al-Dujaili, A.D.JenKins, and D.R.M.Walton, "Liquid crystal polymers with tris(oxy-1,4-phenylene)unit" Makroml. Chem., Rapid Commun., 5, 33-36, 1984. https://doi.org/10.1002/marc.1984.030050105
  12. F.Higashi, T.Mashimo, and I.Takahashi, "Preparation of aromatic polyesters by direct polycondensation with thionyl chloride in pyridine" J. Polym. Sci., Polym. Chem, 24, 97-102, 1986. https://doi.org/10.1002/pola.1986.080240108

Cited by

  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