Processing and performance of aromatic-aliphatic thermotropic polyesters based on vanillic acid

Autor:	Yefeng Yao, Yogesh S. Deshmukh, Han E. H. Meijer, Wenqing Liu, Bart A. J. Noordover, Sanjay Rastogi, Carolus H. R. M. Wilsens
Přispěvatelé:	Processing and Performance, RS: FSE AMIBM, AMIBM
Jazyk:	angličtina
Rok vydání:	2015
Předmět:	chemistry.chemical_classification Diffraction Materials science Polymers and Plastics Organic Chemistry Polymer Thermotropic crystal Polyester chemistry.chemical_compound chemistry Liquid crystal Vanillic acid Materials Chemistry Thermotropic melt Fiber Composite material Spinning
Zdroj:	Polymer, 60, 198-206. Elsevier Polymer, 60, 198-206. ELSEVIER SCI LTD
ISSN:	0032-3861
DOI:	10.1016/j.polymer.2015.01.045
Popis:	In this work we report on the processing, melt-drawing, and performance of new vanillic acid based aliphatic-aromatic thermotropic polyesters. It is demonstrated that these materials are easily processed from their nematic melts yielding highly oriented products. Furthermore, we demonstrate that a molecular weight (M-w) of roughly 30 kg/mol is required in order to successfully perform spinning on these polymers. The application of a polymer with lower M-w results in poor mechanical performance and fiber breakage during the winding process. Wide-angle X-ray diffraction analysis has been performed on the fibers and it is demonstrated that the orientation parameter increases with increasing draw-ratio of the fiber. Although these polymers are readily processed from their thermotropic melts, the obtained fibers only retain their orientation up to temperatures in the range of 120-130 degrees C, after which they start to melt. In general, these fibers exhibit tensile moduli in the range of similar to 10 GPa and a tensile strength around similar to 150-200 MPa. FTIR and solid-state NMR experiments indicate that only the aromatic components are molecularly oriented during the spinning process. In contrast, the aliphatic moieties exhibit a high mobility, normally corresponding to a local isotropic motion. It is expected that the poor molecular orientation of the aliphatic moieties in these aliphatic-aromatic thermotropic polyesters contribute to the relatively low tensile modulus of the fibers, obtained after the extrusion and melt-drawing process.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a534b1232f09b6f72ecff2698344f2cd https://doi.org/10.1016/j.polymer.2015.01.045 Zobrazit plný text záznamu Full Text from ScienceDirect