Effects of the Heat Treatment on the Mechanical Properties of a Novel Thermotropic Liquid-Crystalline Polymer Fiber
| Periodical | Solid State Phenomena (Volumes 181 - 182) |
|---|---|
| Main Theme | Liquid Crystals and Related Materials II |
| Edited by | Yuan Ming Huang |
| Pages | 63-66 |
| DOI | 10.4028/www.scientific.net/SSP.181-182.63 |
| Citation | Wei Biao Zhu et al., 2011, Solid State Phenomena, 181-182, 63 |
| Online since | November, 2011 |
| Authors | Wei Biao Zhu, Hai Xiao Gan, Yuan Yuan Zhuang, Wei Min Qin, Yan Ping Wang, Yi Min Wang |
| Keywords | Crystallization, Heat Treatment, Mechanical Property, TLCPs Fiber |
| Price | US$ 28,- |
Thermotropic liquid-crystalline polymers (TLCPs) have aroused wide public concern which is attributed to their high strength, stiffness, chemical resistance and perfect dimensional stability as high-performance engineering materials. Vectran heat treated after melt spinning is a representative commercial aromatic copolyester fiber. In this study, a novel TLCP melt-polymerized with 4,4’-diphenyloxide dicarboxylic acid (DODA), 4-acetoxybenzoic acid (ABA), hydroquinone diactate (HQA), 2,6-naphthalene dicarboxylic (NDA) and terephthalic acid (TA) were melt spun into fibers and heat treated to enhance the breaking strength and Young’s modulus. Intermolecular mechanical elements slipped between 120-130 oC and crystallization or the conformational rotations occurred along the extended polymer chain. For this new TLCP fiber, the optimal heat treatment temperature was 260 oC and the suitable heat-treatment time was over 48 hours. The breaking strength, Young’s modulus and breaking elongation of the as-spun fiber were improved from 1.58GPa, 45.21GPa and 1.97% to 3.20GPa, 133.44GPa and 2.42% respectively after heat treatment.
