Article
  • Comparison of the Properties of Thermotropic Liquid Crystalline Polymer Nanocomposites with Organically Modified Montmorillonites
  • Tae-Young Ha*,**, Ji Hoon Choi*, and Jin-Hae Chang*,†

  • *Department of Polymer Science and Engineering, Kumoh National Institute of Technology, Gumi 39177, Korea
    **Seyang Polymer Co. Ltd., Tech Center/Anseong Plant, Anseong 17602, Korea

  • 유기화 몬모릴로나이트를 사용한 열방성 액정 고분자 나노 복합체의 물성 비교
  • 하태영*,** · 최지훈* · 장진해*,†

  • *금오공과대학교 고분자공학과, **세양폴리머(주) 안성공장 기술연구소

Abstract

A thermotropic liquid crystalline polymer (TLCP) nanocomposite was synthesized via in-situ intercalation polymerization of 4-(4-acetoxy-1,4-phenyleneoxytetramethyleneoxy)benzoic acid, which was newly synthesized in the presence of organoclay. Organoclay was prepared by the cation exchange reaction of sodium-montmorillonite (Na+-MMT) with a solution of the ammonium salt of ethyl-4-aminobenzoate (EAB). Ethyl-4-aminobenzoate-montmorillonite (EAB-MMT) and Cloisite® 30B were used in the formation of TLCP hybrids. The thermal properties, morphologies, and liquid crystalline phases of TLCP hybrids with two different organoclays were compared. The addition of only a small amount of organoclay was sufficient to improve the thermal properties of the TLCP hybrids. Even polymers with low organoclay content (1-9 wt%) were found to exhibit much higher glass transition temperature (Tg), melt transition temperature (Tm), and initial decomposition temperature (TDi) values than those of pure TLCP. The addition of EAB-MMT was more effective than that of Cloisite® 30B in improving the thermal properties. The intercalation of the polymer chains in the clays was examined by wide-angle X-ray diffraction (XRD) and transmission electron microscopy (TEM).


4-(4-acetoxy-1,4-phenyleneoxytetramethyleneoxy)benzoic acid와 유기화 점토를 사용하여 in-situ 삽입 중합법 (in-situ intercalation polymerization)을 통해 열방성 액정고분자(thermotropic liquid crystalline polymer, TLCP) 나노복합체를 합성하였다. Ethyl-4-aminobenzoate(EAB) 암모늄 염 용액과 나트륨 양이온 몬모릴로나이트(Na+-MMT)와의 양이온 교환 반응을 통해 유기화 점토(EAB-MMT)를 제조하였다. 유기화 점토인 EAB-MMT와 Cloisite® 30B를 이용하여 TLCP 복합체를 만들었으며, 두 가지 유기화 점토를 사용하여 만든 TLCP 나노 복합체의 열적 특성, 모폴로지 및 액정상을 서로 비교하였다. 단지 소량의 유기화 점토를 사용하여 TLCP 복합체의 열적 특성을 향상시켰으며, 낮은 유기화 점토 함량(1-9 wt%)을 넣은 TLCP가 순수한 TLCP보다 더 높은 유리 전이 온도(Tg), 녹음 전이 온도(Tm) 및 초기 열 분해 온도(TDi) 값을 보였다. 열적 특성에 관해서는 EAB-MMT가 Cloisite® 30B보다 더 효과적이었다. 고분자 사슬이 삽입된 점토는 넓은 각 X-선 회절도(X-ray diffraction, XRD)와 투과 전자 현미경(transmission electron microscopy, TEM)을 통해 관찰하였다.


Keywords: thermotropic liquid crystalline polymer, organoclay, nanocomposite, thermal property, morphology

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2022 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2018; 42(1): 41-51

    Published online Jan 25, 2018

  • 10.7317/pk.2018.42.1.41
  • Received on Jun 11, 2017
  • Revised on Aug 3, 2017
  • Accepted on Aug 14, 2017

Correspondence to

  • Jin-Hae Chang
  • Department of Polymer Science and Engineering, Kumoh National Institute of Technology, Gumi 39177, Korea

  • E-mail: changjinhae@hanmail.net