کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1443614 1509457 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Bio-based conductive composites: Preparation and properties of polypyrrole (PPy)-coated silk fabrics
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد بیومتریال
پیش نمایش صفحه اول مقاله
Bio-based conductive composites: Preparation and properties of polypyrrole (PPy)-coated silk fabrics
چکیده انگلیسی

Silk fabrics were coated with electrically conducting doped polypyrrole (PPy) by in situ oxidative polymerisation from an aqueous solution of pyrrole (Py) at room temperature, by using FeCl3 as catalyst. The amount of polymer deposited on the fabrics increased with increasing the reaction time or the concentration of Py in the reaction system. PPy-coated silk fabrics were characterized by optical microscopy (OM) and scanning electron microscopy (SEM), Fourier transform-infrared (FT-IR) spectroscopy, and thermal analysis (differential scanning calorimetry (DSC), thermogravimetric (TG)). OM and SEM showed that PPy completely coated the surface of individual silk fibres and that the polymerisation process occurred only at the fibre surface and not in the bulk. FT-IR (attenuated total reflectance (ATR) mode) showed a mixed spectral pattern with bands typical of silk and PPy overlapping over the entire wavenumbers range. The intrinsic crystalline structure and the molecular conformation of silk were not affected by the polymerisation. PPy-coated silk fabrics attained a significantly higher thermal stability than untreated ones, owing to the protective effect of the PPy layer against thermal degradation. PPy-coated silk fabrics displayed excellent electrical properties. Current versus voltage curves showed a linear fit, with higher current increments at higher PPy amount. The resistance of PPy-coated silk fabrics decreased exponentially with increasing the reaction time or the concentration of Py in the reaction system. Due to the Joule effect, the temperature of PPy-coated silk fabrics increased as a function of the electrical potential applied and of the amount of PPy. The encouraging results reported in this study open new perspectives for future application of PPy-coated silk fabrics, from interactive and smart textiles to innovative bio-based conductive composites for biomedical end-uses.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Synthetic Metals - Volume 159, Issues 3–4, February 2009, Pages 246–253
نویسندگان
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