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

POLYMER

卷:60

Article

Wilsens, Carolus H. R. M.^1,2,3  Deshmukh, Yogesh S.³  Liu, Wenqing⁴  Noordover, Bart A. J.¹  Yao, Yefeng⁴  Meijer, Han E. H.¹  Rastogi, Sanjay^2,3,5 

[1] Eindhoven Univ Technol, Lab Polymer Mat, NL-5600 MB Eindhoven, Netherlands

[2] Dutch Polymer Inst, NL-5600 AX Eindhoven, Netherlands

[3] Maastricht Univ, Dept Biobased Mat, NL-6200 MD Maastricht, Netherlands

[4] E China Normal Univ, Shanghai Key Lab Magnet Resonance, Shanghai 200062, Peoples R China

[5] Univ Loughborough, Dept Mat, Loughborough, Leics, England

关键词: Fiber;    Thermotropic melt;    Vanillic acid;   

DOI  :  10.1016/j.polymer.2015.01.045

来源: Elsevier

【 摘 要 】

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. (C) 2015 Elsevier Ltd. All rights reserved.

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