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    Composition Gradient, Structure, and Mechanical Properties of Mono Epoxy Terminated Polydimethylsiloxanes Grafted Gelatin Films

    Year: 2018

    Journal: Russ. J. Phys. Chem. A, Volume 92, SEP, page 1733–1741

    Authors: Li, Jing; Chi, Hong; Xu, Jing; Li, Tianduo

    Organizations: National Natural Science Funds of China [21376125, 21606138]; National Natural Science Funds of Shandong Province [2015GGX108002]; Program for Scientific Research Innovation Team in Colleges and Universities of Shandong Province

    Keywords: compositional gradient; self-assembly; migration; gelatin; polydimethylsiloxanes

    In present study, -[3-(2,3-epoxy propoxy) propyl]--butyl-polydimethylsiloxanes grafted gelatin (PGG) compositional gradient film was successfully fabricated by combining a solvent induced self-assembly procedure and the interaction between polymer and air/substrate induced migration. The variation of gelatin superstructures and the transformation of PGG aggregate structure with tuning volume ratio of water/ethanol studied by Atomic force microscopy (AFM), Fourier-transform infrared (FTIR) and High-resolution transmission electron microscopy (HR-TEM). At 1:3 vol/vol, gelatin chains self-assembled to cyclic aggregates that tended to deposit on the gelatin substrate, while PGG formed core-shell structure which should migrate to air-liquid interface driven by low free energy of PDMS chain during drying. X-ray photoelectron spectroscopy (XPS) showed that the surface of gradient film was covered with PDMS component and strong intermolecular interactions existed in between polymer and solvent molecules at 1:3 vol/vol. The gradients of PDMS composition along longitudinal orient in film were further confirmed by scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) with line scan. Contact angle results exhibited a successive decrease of hydrophobicity along longitudinal orient in gradient film. Dynamic mechanical analysis (DMA) results showed two tan and lower storage modulus in gradient than that of blank gelatin film, which led to good flexibility of gradient film.
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