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This study developed pigmented linear low-density polyethylene (LLDPE) sheets with maintained mechanical properties and infrared (IR) transparency. Pigments like ZnO and TiO2 were used, showing tunable IR properties for various applications.

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Area of Science:

  • Materials Science
  • Polymer Science

Background:

  • Developing functionalized polymers for specific applications is crucial.
  • Linear low-density polyethylene (LLDPE) is a versatile polymer with potential for modification.

Purpose of the Study:

  • To create pigmented LLDPE sheets with preserved mechanical strength and infrared (IR) transparency.
  • To investigate the effect of different pigments and concentrations on LLDPE properties.
  • To explore micro-structuring for tunable IR properties.

Main Methods:

  • Six pigments (ZnO, ZnS, TiO2, FeO yellow, FeO light brown, FeO dark brown) were blended with LLDPE at 1, 3, and 5 wt%.
  • Mechanical properties were assessed using tensile strength tests.
  • Infrared (IR) transparency was measured using direct and reflected heat sources.
  • Fourier Transform Infrared Spectroscopy (FTIR) and ultraviolet-visible (UV-VIS) spectroscopy were employed.

Main Results:

  • Tensile strength remained largely unaffected at lower pigment concentrations (1-3 wt%), with slight reductions at 5 wt%.
  • White-pigmented sheets retained over 85% IR transparency; colored pigments showed 70-91% transmittance.
  • The critical IR transparency range (8-12 μm) was unaffected by pigments.
  • UV-VIS testing indicated increased visible-light absorption in white-pigmented sheets and high opacity in colored sheets.
  • Micro-structuring effectively scattered IR radiation.

Conclusions:

  • Pigmented LLDPE sheets can be developed while maintaining essential mechanical properties and IR transparency.
  • The choice of pigment and concentration allows for tunable IR and visible light properties.
  • These materials are suitable for applications requiring visual opacity and IR transparency, such as thermal management and camouflage.