کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7170775 | 1463304 | 2016 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Deformation-induced mechanical anisotropy of gelatin films
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
مهندسی انرژی و فناوری های برق
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Deformation-induced mechanical and structural anisotropy has been analyzed using a gelatin film model. Specifically, gelatin films cast from water and 2,2,2-trifluoroethanol (TFE) are stretched at various draw ratios, locked-in the extended conformations, crosslinked by glutaraldehyde, and then mechanically analyzed in the longitudinal and transverse directions. Notably, the longitudinal modulus of the gelatin films that are cast from water or TFE linearly increases with draw ratio λ, accompanied by a substantial reduction in transverse modulus. When normalized by the Young's modulus of undrawn films, the transverse moduli as a function of draw ratio follow a power-law relationship E/E0âλα, where αââ2.5 for the water-cast films and αââ1.5 for the TFE-cast films. A Scanning Electron Microscopic analysis of the water- and TFE-cast films shows the formation of wrinkles and microcracks oriented in the drawing direction due to large deformations. Fourier Transform Infrared spectroscopy reveals the dominance of aggregated strands and β-sheets in the secondary structures of the gelatin films and the deformation-induced renaturation of triple-helical structures in the films. A model is thus proposed relate the observed mechanical anisotropy of drawn gelatin films to deformation-induced structural anisotropy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Extreme Mechanics Letters - Volume 7, June 2016, Pages 18-26
Journal: Extreme Mechanics Letters - Volume 7, June 2016, Pages 18-26
نویسندگان
Weibing Teng, Xiangming Zhang, Valerie Merkle, Xiaoyi Wu,