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Resin Chemistry-Driven Starch Reinforcement in Water-Free Photocurable Networks.

Md Arif Mahmud1, Chamil Abeykoon1, Prasad Potluri1

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Starch reinforcement in photocurable systems presents challenges but offers benefits. All-methacrylate formulations showed the highest strength, while biocompatible polymer blends exhibited reduced mechanical performance due to network heterogeneity.

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Area of Science:

  • Polymer Science
  • Biomaterials Engineering
  • Materials Science

Background:

  • Starch incorporation into water-free photocurable systems is explored for material reinforcement.
  • Challenges include starch compatibility and processing within these advanced polymer formulations.
  • Biocompatible polymers and methacrylic acid-based polymers are key components.

Purpose of the Study:

  • To investigate the effects of starch loading on the mechanical and thermal properties of photocurable systems.
  • To evaluate the influence of different polymer matrices (all-methacrylate vs. biocompatible blends) on starch reinforcement.
  • To understand how resin chemistry impacts starch incorporation and network structure.

Main Methods:

  • Mechanical testing (tensile, flexural strength) and dynamic mechanical analysis (DMA).
  • Thermal analysis, Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and gel fraction analysis.
  • Systematic variation of starch content and polymer matrix composition.

Main Results:

  • The all-methacrylate formulation achieved the highest tensile (17.0 MPa) and flexural (13.8 MPa) strength at 40% starch loading.
  • Highest flexural strength (17.1 MPa) was observed at lower starch loading, but with decreased tensile performance, indicating a trade-off between stiffness and toughness.
  • Biocompatible polymer combinations and coupling agents led to lower mechanical performance, suggesting more rigid network behavior in methacrylate systems and increased heterogeneity in starch-compatible systems.

Conclusions:

  • Resin chemistry significantly influences starch incorporation and the resulting network structure in photocurable systems.
  • All-methacrylate systems offer superior mechanical reinforcement with starch, albeit with potential impacts on toughness.
  • The study highlights the complex interplay between filler, matrix, and processing in developing reinforced photocurable biomaterials.