화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.42, No.1, 41-51, January, 2018
DOI10.7317/pk.2018.42.1.41  Export Citation
유기화 몬모릴로나이트를 사용한 열방성 액정 고분자 나노 복합체의 물성 비교
Comparison of the Properties of Thermotropic Liquid Crystalline Polymer Nanocomposites with Organically Modified Montmorillonites
하태영1, 2, 최지훈2, 장진해2, †
  • 1금오공과대학교 고분자공학과
  • 2세양폴리머(주) 안성공장 기술연구소
Tae-Young Ha1, 2, Ji Hoon Choi1, and Jin-Hae Chang1, †
  • 1Department of Polymer Science and Engineering, Kumoh National Institute of Technology, Gumi 39177, Korea
  • 2Tech Center/Anseong Plant, Seyang Polymer Co. Ltd., Anseong 17602, Korea
E-mail:
초록
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) 나노 복합체를 합성하였다. Ethyl-4-aminobenzoate(EAB) 암모늄 염 용액과 나트륨 양이온 몬모릴로나이트(Na+-MMT)와 의 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 향상시켰으 며, 낮은 유기화 점토 함량(1-9 wt%)을 넣은 TLCP가 순수한 TLCP보다 더 높은 유리 전이 온도(T g), 녹음 전이 온도(Tm) 및 초기 열 분해 온도(TDi) 값을 보였다. 열적 특성에 관해서는 EAB-MMT가 Cloisite® 30B보다 더 효과적이 었다. 고분자 사슬이 삽입된 점토는 넓은 각 X-선 회절도(X-ray diffraction, XRD)와 투과 전자 현미경(transmission electron microscopy, TEM)을 통해 관찰하였다.
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).
Keywords:thermotropic liquid crystalline polymer;organoclay;nanocomposite;thermal property;morphology
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