کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5180232 1502546 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Processing and performance of aromatic-aliphatic thermotropic polyesters based on vanillic acid
ترجمه فارسی عنوان
پردازش و عملکرد پلی استرهای ترموتروپیک آلفا-آلیفاتیک بر اساس اسید وانیلیک
کلمات کلیدی
فیبر، ذوب ترمودرویک، اسید وانیلیک،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی


- Bio-based aliphatic-aromatic thermotropic polyesters.
- Vanillic acid based polymers.
- Fiber spinning, solution casting, compression molding.

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 (Mw) of roughly 30 kg/mol is required in order to successfully perform spinning on these polymers. The application of a polymer with lower Mw 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 °C, after which they start to melt. In general, these fibers exhibit tensile moduli in the range of ∼10 GPa and a tensile strength around ∼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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 60, 9 March 2015, Pages 198-206
نویسندگان
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