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Area of Science:

  • Polymer Science
  • Materials Science
  • Photochemistry

Background:

  • Improving low-temperature physical and mechanical properties of 3D printing compositions is crucial.
  • Ethylene-vinyl acetate copolymer (EVA) is explored as a potential modifier for photosensitive materials.
  • Investigating EVA's role as both a thermoplastic modifier and a polymer chain brancher in photopolymer formulations.

Purpose of the Study:

  • To evaluate the feasibility of using heat-treated EVA as a modifier in tert-butyl acrylate (tBA)-based photosensitive compositions.
  • To understand the impact of EVA on rheological, curing, and structural properties of photocured systems.
  • To assess EVA's potential as a crosslinking agent in conjunction with tBA.

Main Methods:

  • Fourier-transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopy for molecular structure analysis.
  • Rheometry and spectrophotometry to study composition flow and curing kinetics.
  • Photo-differential scanning calorimetry (Photo-DSC) and scanning electron microscopy (SEM) for phase organization and morphology.

Main Results:

  • Heat treatment of EVA generates C=C bonds, enabling potential crosslinking with tBA.
  • EVA acts as an effective thickener, shifting composition flow from Newtonian to pseudoplastic with increasing concentration.
  • Higher EVA concentrations reduce photochemical polymerization rates and the overall degree of conversion.

Conclusions:

  • Heat-treated EVA can modify and thicken photosensitive compositions for 3D printing.
  • The formation of a heterogeneous phase structure and lack of a continuous network limit EVA's use as a simultaneous crosslinker.
  • EVA's primary role is as a functional additive, not a crosslinking agent, in this tBA-based system.