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Polymers 2018, 10(6), 677; https://doi.org/10.3390/polym10060677

Preparation of Compositional Gradient Polymeric Films Based on Gradient Mesh Template

1
Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
2
College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250100, China
*
Authors to whom correspondence should be addressed.
Received: 19 May 2018 / Revised: 12 June 2018 / Accepted: 15 June 2018 / Published: 18 June 2018
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Abstract

In this paper, a template-filling method was found to prepare composition gradient gelatin films by incorporating α-[3-(2,3-epoxypropoxy) propyl]-ω-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 µm. Colloidal particles about 0.9~10 µm 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 Full-Text
Keywords: compositional gradient; gradient mesh template; filling method; hydrophilic/hydrophobic; water vapor permeability compositional gradient; gradient mesh template; filling method; hydrophilic/hydrophobic; water vapor permeability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Teng, H.; Li, J.; Hou, Z.; Yan, X.; Han, L.; Xu, J.; Li, T. Preparation of Compositional Gradient Polymeric Films Based on Gradient Mesh Template. Polymers 2018, 10, 677.

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