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Area of Science:

  • Polymer science and engineering
  • Materials science
  • Manufacturing processes

Background:

  • Rotational molding produces hollow parts with good aesthetics and properties.
  • Key limitations include lack of pressure and long cycle times, restricting material choices.
  • Fillers are used to create composite materials for rotational molding.

Purpose of the Study:

  • To review the use of fillers in rotational molding to create composite materials.
  • To identify common filler types and their effects on material properties and processability.
  • To highlight research gaps, particularly concerning inorganic waste materials.

Main Methods:

  • Literature review of studies on fillers in rotational molding.
  • Analysis of filler types, loadings, and their impact on mechanical properties.
  • Assessment of processability and final properties of rotomolded composites.

Main Results:

  • Glass fibers/particles are common fillers; carbon fibers and clays are also studied.
  • Optimal filler loadings (around 10%) often increase mechanical properties.
  • Micro/nano-fillers (clay, graphene) require lower loadings (≤3%); higher loadings can decrease properties or processability.

Conclusions:

  • Inorganic filler incorporation, especially waste materials, is underexplored in rotational molding.
  • Further research is needed on processing and properties of composites with inorganic waste.
  • Investigating filler/reinforcement ratios and preprocessing methods (dry blending vs. melt compounding) is crucial.