Cargando…

Effects of Poly(ethylene-co-glycidyl methacrylate) on the Microstructure, Thermal, Rheological, and Mechanical Properties of Thermotropic Liquid Crystalline Polyester Blends

In this study, a series of thermotropic liquid crystalline polyester (TLCP)-based blends containing 1–30 wt% poly(ethylene-co-glycidyl methacrylate) (PEGMA) were fabricated by masterbatch-assisted melt-compounding. The scanning electron microscopy (SEM) images showed a uniformly dispersed microfibri...

Descripción completa

Detalles Bibliográficos
Autores principales: Lee, Sang Hoon, Jeon, Ha-Bin, Hwang, Gyu-Hyun, Kwon, Young Seung, Lee, Ji-Su, Park, Gyu-Tae, Kim, Soo-Yeon, Kang, Ha-Eun, Choi, Eun-Ji, Jang, Sun-Hwa, Lee, Youn Eung, Jeong, Young Gyu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7570049/
https://www.ncbi.nlm.nih.gov/pubmed/32957630
http://dx.doi.org/10.3390/polym12092124
_version_ 1783596859826110464
author Lee, Sang Hoon
Jeon, Ha-Bin
Hwang, Gyu-Hyun
Kwon, Young Seung
Lee, Ji-Su
Park, Gyu-Tae
Kim, Soo-Yeon
Kang, Ha-Eun
Choi, Eun-Ji
Jang, Sun-Hwa
Lee, Youn Eung
Jeong, Young Gyu
author_facet Lee, Sang Hoon
Jeon, Ha-Bin
Hwang, Gyu-Hyun
Kwon, Young Seung
Lee, Ji-Su
Park, Gyu-Tae
Kim, Soo-Yeon
Kang, Ha-Eun
Choi, Eun-Ji
Jang, Sun-Hwa
Lee, Youn Eung
Jeong, Young Gyu
author_sort Lee, Sang Hoon
collection PubMed
description In this study, a series of thermotropic liquid crystalline polyester (TLCP)-based blends containing 1–30 wt% poly(ethylene-co-glycidyl methacrylate) (PEGMA) were fabricated by masterbatch-assisted melt-compounding. The scanning electron microscopy (SEM) images showed a uniformly dispersed microfibrillar structure for the TLCP component in cryogenically-fractured blends, without any phase-separated domains. The FT-IR spectra showed that the carbonyl stretching bands of TLCP/PEGMA blends shifted to higher wavenumbers, suggesting the presence of specific interactions and/or grafting reactions between carboxyl/hydroxyl groups of TLCP and glycidyl methacrylate groups of PEGMA. Accordingly, the melting and crystallization temperatures of the PEGMA component in the blends were greatly lowered compared to the TLCP component. The thermal decomposition peak temperatures of the PEGMA and TLCP components in the blends were characterized as higher than those of neat PEGMA and neat TLCP, respectively. From the rheological data collected at 300 °C, the shear moduli and complex viscosities for the blend with 30 wt% PEGMA were found to be much higher than those of neat PEGMA, which supports the existence of PEGMA-g-TLCP formed during the melt-compounding. The dynamic mechanical thermal analysis (DMA) analyses demonstrated that the storage moduli of the blends decreased slightly with the PEGMA content up to 3 wt%, increased at the PEGMA content of 5 wt%, and decreased again at PEGMA contents above 7 wt%. The maximum storage moduli for the blend with 5 wt% PEGMA are interpreted to be due to the reinforcing effect of PEGMA-g-TLCP copolymers.
format Online
Article
Text
id pubmed-7570049
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-75700492020-10-29 Effects of Poly(ethylene-co-glycidyl methacrylate) on the Microstructure, Thermal, Rheological, and Mechanical Properties of Thermotropic Liquid Crystalline Polyester Blends Lee, Sang Hoon Jeon, Ha-Bin Hwang, Gyu-Hyun Kwon, Young Seung Lee, Ji-Su Park, Gyu-Tae Kim, Soo-Yeon Kang, Ha-Eun Choi, Eun-Ji Jang, Sun-Hwa Lee, Youn Eung Jeong, Young Gyu Polymers (Basel) Article In this study, a series of thermotropic liquid crystalline polyester (TLCP)-based blends containing 1–30 wt% poly(ethylene-co-glycidyl methacrylate) (PEGMA) were fabricated by masterbatch-assisted melt-compounding. The scanning electron microscopy (SEM) images showed a uniformly dispersed microfibrillar structure for the TLCP component in cryogenically-fractured blends, without any phase-separated domains. The FT-IR spectra showed that the carbonyl stretching bands of TLCP/PEGMA blends shifted to higher wavenumbers, suggesting the presence of specific interactions and/or grafting reactions between carboxyl/hydroxyl groups of TLCP and glycidyl methacrylate groups of PEGMA. Accordingly, the melting and crystallization temperatures of the PEGMA component in the blends were greatly lowered compared to the TLCP component. The thermal decomposition peak temperatures of the PEGMA and TLCP components in the blends were characterized as higher than those of neat PEGMA and neat TLCP, respectively. From the rheological data collected at 300 °C, the shear moduli and complex viscosities for the blend with 30 wt% PEGMA were found to be much higher than those of neat PEGMA, which supports the existence of PEGMA-g-TLCP formed during the melt-compounding. The dynamic mechanical thermal analysis (DMA) analyses demonstrated that the storage moduli of the blends decreased slightly with the PEGMA content up to 3 wt%, increased at the PEGMA content of 5 wt%, and decreased again at PEGMA contents above 7 wt%. The maximum storage moduli for the blend with 5 wt% PEGMA are interpreted to be due to the reinforcing effect of PEGMA-g-TLCP copolymers. MDPI 2020-09-17 /pmc/articles/PMC7570049/ /pubmed/32957630 http://dx.doi.org/10.3390/polym12092124 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lee, Sang Hoon
Jeon, Ha-Bin
Hwang, Gyu-Hyun
Kwon, Young Seung
Lee, Ji-Su
Park, Gyu-Tae
Kim, Soo-Yeon
Kang, Ha-Eun
Choi, Eun-Ji
Jang, Sun-Hwa
Lee, Youn Eung
Jeong, Young Gyu
Effects of Poly(ethylene-co-glycidyl methacrylate) on the Microstructure, Thermal, Rheological, and Mechanical Properties of Thermotropic Liquid Crystalline Polyester Blends
title Effects of Poly(ethylene-co-glycidyl methacrylate) on the Microstructure, Thermal, Rheological, and Mechanical Properties of Thermotropic Liquid Crystalline Polyester Blends
title_full Effects of Poly(ethylene-co-glycidyl methacrylate) on the Microstructure, Thermal, Rheological, and Mechanical Properties of Thermotropic Liquid Crystalline Polyester Blends
title_fullStr Effects of Poly(ethylene-co-glycidyl methacrylate) on the Microstructure, Thermal, Rheological, and Mechanical Properties of Thermotropic Liquid Crystalline Polyester Blends
title_full_unstemmed Effects of Poly(ethylene-co-glycidyl methacrylate) on the Microstructure, Thermal, Rheological, and Mechanical Properties of Thermotropic Liquid Crystalline Polyester Blends
title_short Effects of Poly(ethylene-co-glycidyl methacrylate) on the Microstructure, Thermal, Rheological, and Mechanical Properties of Thermotropic Liquid Crystalline Polyester Blends
title_sort effects of poly(ethylene-co-glycidyl methacrylate) on the microstructure, thermal, rheological, and mechanical properties of thermotropic liquid crystalline polyester blends
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7570049/
https://www.ncbi.nlm.nih.gov/pubmed/32957630
http://dx.doi.org/10.3390/polym12092124
work_keys_str_mv AT leesanghoon effectsofpolyethylenecoglycidylmethacrylateonthemicrostructurethermalrheologicalandmechanicalpropertiesofthermotropicliquidcrystallinepolyesterblends
AT jeonhabin effectsofpolyethylenecoglycidylmethacrylateonthemicrostructurethermalrheologicalandmechanicalpropertiesofthermotropicliquidcrystallinepolyesterblends
AT hwanggyuhyun effectsofpolyethylenecoglycidylmethacrylateonthemicrostructurethermalrheologicalandmechanicalpropertiesofthermotropicliquidcrystallinepolyesterblends
AT kwonyoungseung effectsofpolyethylenecoglycidylmethacrylateonthemicrostructurethermalrheologicalandmechanicalpropertiesofthermotropicliquidcrystallinepolyesterblends
AT leejisu effectsofpolyethylenecoglycidylmethacrylateonthemicrostructurethermalrheologicalandmechanicalpropertiesofthermotropicliquidcrystallinepolyesterblends
AT parkgyutae effectsofpolyethylenecoglycidylmethacrylateonthemicrostructurethermalrheologicalandmechanicalpropertiesofthermotropicliquidcrystallinepolyesterblends
AT kimsooyeon effectsofpolyethylenecoglycidylmethacrylateonthemicrostructurethermalrheologicalandmechanicalpropertiesofthermotropicliquidcrystallinepolyesterblends
AT kanghaeun effectsofpolyethylenecoglycidylmethacrylateonthemicrostructurethermalrheologicalandmechanicalpropertiesofthermotropicliquidcrystallinepolyesterblends
AT choieunji effectsofpolyethylenecoglycidylmethacrylateonthemicrostructurethermalrheologicalandmechanicalpropertiesofthermotropicliquidcrystallinepolyesterblends
AT jangsunhwa effectsofpolyethylenecoglycidylmethacrylateonthemicrostructurethermalrheologicalandmechanicalpropertiesofthermotropicliquidcrystallinepolyesterblends
AT leeyouneung effectsofpolyethylenecoglycidylmethacrylateonthemicrostructurethermalrheologicalandmechanicalpropertiesofthermotropicliquidcrystallinepolyesterblends
AT jeongyounggyu effectsofpolyethylenecoglycidylmethacrylateonthemicrostructurethermalrheologicalandmechanicalpropertiesofthermotropicliquidcrystallinepolyesterblends