Influence of hydroquinone content on thermotropic liquid crystalline copolymers and nanocomposites: thermo-mechanical properties and morphology
- Authors
- Woo, Hyeonjun; Jeon, Hara; Jang, Du Chan; Kwac, Lee Ku; Kim, Hong Gun; Chang, Jin-Hae
- Issue Date
- Mar-2022
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- RSC ADVANCES, v.12, no.15, pp 8852 - 8861
- Pages
- 10
- Journal Title
- RSC ADVANCES
- Volume
- 12
- Number
- 15
- Start Page
- 8852
- End Page
- 8861
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/28237
- DOI
- 10.1039/d2ra00795a
- ISSN
- 2046-2069
2046-2069
- Abstract
- Thermotropic liquid crystalline copolyesters (Co-TLCPs) were synthesized by varying the hydroquinone (HQ) molar ratio from 1-5 with respect to the 2,5-diethoxyterephthalic acid (ETA) monomer. The thermal properties and liquid crystalline mesophases of the synthesized Co-TLCP were investigated. All of the Co-TLCPs synthesized using a HQ molar ratio of 1-5 showed a nematic liquid crystalline phase. Among the Co-TLCPs obtained using HQ in various molar ratios, the most stable physical properties and a clear liquid crystalline phase were obtained when HQ was 4 mol. Among the various Co-TLCPs synthesized, hybrids were prepared using Co-TLCP synthesized with a 1 : 4 = ETA : HQ ratio and organoclay. A 1-10% loading of the organoclay Cloisite 93A was employed per weight of TLCP, and the clay was dispersed using the melt intercalation method. Among the Co-TLCP hybrids, the morphology and thermal properties of the hybrids were investigated according to the changes in the Cloisite 93A in the 1-10 wt% range. In general, the thermal properties were superior when the organoclay loading was 3 wt% and were inferior when the organoclay amount was 5 wt% or more. This result was confirmed by the dispersibility of the clay through transmission electron microscopy.
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