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Preparation of Compositional Gradient Polymeric Films Based on Gradient Mesh Template.

Honglei Teng1, Jing Li2, Zhaosheng Hou3

  • 1Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China. Tenghonglei1122@163.com.

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|April 11, 2019
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Summary

This study introduces a novel method for creating composition gradient gelatin films using a template-filling technique. The resulting films exhibit a continuous change in hydrophilicity/hydrophobicity, offering potential as biomimetic materials and leather finishing agents.

Keywords:
compositional gradientfilling methodgradient mesh templatehydrophilic/hydrophobicwater vapor permeability

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Developing advanced biopolymer films with tailored properties is crucial for applications in biomaterials and surface coatings.
  • Existing methods for creating gradient materials often lack control over composition and structural uniformity.
  • Gelatin, a natural biopolymer, offers biocompatibility but requires modification for enhanced functionality and stability.

Purpose of the Study:

  • To develop a template-filling method for preparing composition gradient gelatin films.
  • To incorporate polydimethylsiloxane (PDMS) into gelatin to create a hydrophilic/hydrophobic gradient.
  • To evaluate the properties and potential applications of the gradient gelatin films.

Main Methods:

  • Preparation of a gradient gelatin mesh template using methacrylic anhydride cross-linking under a temperature gradient.
  • Synthesis of PDMS-grafted gelatin (PGG) and formation of colloidal particles.
  • Filling the gradient template with PGG colloidal particles under vacuum and subsequent drying to form gradient films.
  • Characterization using SEM-EDX, FTIR, TGA, DSC, and mechanical tensile testing.

Main Results:

  • The gradient mesh template exhibited controlled porosity and pore size reduction.
  • PDMS-grafted gelatin colloidal particles were successfully incorporated into the template.
  • Analysis confirmed a gradient distribution of silicon (from PDMS) along the film thickness.
  • The gradient films displayed a continuous change in hydrophilic/hydrophobic properties.
  • Excellent water vapor permeability and flexibility were observed in the gradient films.

Conclusions:

  • The template-filling method is effective for preparing composition gradient gelatin films with tunable properties.
  • The gradient films possess a unique hydrophilic/hydrophobic gradient, making them suitable for advanced applications.
  • These gradient films show promise as biomimetic materials and effective leather finishing agents.