Drawing-Induced Changes in Morphology and Mechanical Properties of Hornet Silk Gel Films

作者：Kameda Tsunenori^*; Kojima Katsura; Togawa Eiji; Sezutsu Hideki; Zhang Qiang; Teramoto Hidetoshi; Tamada Yasushi

来源：Biomacromolecules, 2010, 11(4): 1009-1018.

DOI：10.1021/bm901472a

Complete amino acid sequences of the four major proteins (Vssilk 1-4) of silk (hornet silk) obtained from yellow hornet (Vespa Vespinae, Vespidae) cocoons have been determined. The native structure of the hornet silk (HS), in which Vssilk 1-4 have an alpha-helix domain with coiled-coil alpha-helices and a beta-sheet domain, is restored when hornet silk gel films (HSGFs) are formed by pressing and drying HS hydrogel. Necking occurs when dry HSGFs are drawn; however, wet HSGFs can be uniaxially drawn with a draw ratio (DR) of 2. Drawing helps obtain high-performance films with a maximum tensile strength and tensile modulus of 170 MPa and 5.5 GPa, respectively. Drawing-induced changes in the orientation and conformation of the coiled-coil structure are investigated.

• 出版日期2010-4