Contact
    Start Publications Preparation of Compositional Gradient Polymeric Films Based on ...
    ←  Publication Finder
    Attension

    Preparation of Compositional Gradient Polymeric Films Based on Gradient Mesh Template

    Year: 2018

    Journal: Polymers, Volume 10, JUN

    Authors: Teng, Honglei; Li, Jing; Hou, Zhaosheng; Yan, Xilu; Han, Linru; 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; gradient mesh template; filling method; hydrophilic; hydrophobic; water vapor permeability

    In this paper, a template-filling method was found to prepare composition gradient gelatin films by incorporating -[3-(2,3-epoxypropoxy) propyl]--butyl-polydimethylsiloxane (PDMS-E) grafted gelatin (PGG) into a gradient gelatin mesh template. The method can be used to prepare other composition gradient biopolymer films. Gradient mesh template prepared by the methacrylic anhydride cross-linked gelatin under temperature gradient field. The porosity of the template decreased from 89 to 35% which was accompanied by decrease in average pore size from 160 to 50 mu m. Colloidal particles about 0.9 similar to 10 mu m were formed from PGG after adding them to a mixed solvent system of 9:1 (v/v) of ethanol/water, which were filled in the mesh template under vacuum (0.06 MPa). A gradient film was obtained after drying at room temperature for 48 h. The results of scanning electron microscope-energy dispersive X-ray combined with freezing microtome and Fourier transform infrared spectroscopy suggested that the distribution of the Si element along the thickness showed a typical gradient pattern, which led to hydrophilic/hydrophobic continuous changing along the thickness of film. The water vapor permeability, thermal gravimetric analysis, differential scanning calorimetry and dynamic mechanical tensile results show that the gradient films had excellent water vapor permeability and flexibility, and hence could be used as biomimetic materials and leather finishing agents.
    View publication