Spider dragline silk composite films doped with linear and telechelic polyalanine: Effect of polyalanine on the structure and mechanical properties.

ABSTRACT: Spider dragline silks have attracted intensive attention as eco-friendly tough materials because of their excellent mechanical property and biomass-based origin. Composite films based on a recombinant spider dragline silk protein (ADF3) from Araneus diadematus were prepared by doping with linear or telechelic poly(L-alanine) (L- or T-polyA, respectively) as a reinforcing agent. Higher tensile strength and toughness of the composite films were achieved with the addition of polyA compared with the tensile strength and toughness of the silk-only film. The difference in the reinforcing behavior between L- and T-polyA was associated with their primary structures, which were revealed by wide angle X-ray diffraction analysis. L-polyA showed a tendency to aggregate in the composite films and induce crystallization of the inherent silk ?-sheet to afford rigid but brittle films. By contrast, T-polyA dispersion in the composite films led to the formation of ?-sheet crystal of both T-polyA and the inherent silk, which imparted high strength and toughness to the silk films.

SUBMITTER: Tsuchiya K 

PROVIDER: S-EPMC5827030 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature