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Related Concept Videos

Polymer Classification: Crystallinity01:21

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Updated: Jul 15, 2025

A Soft Tooling Process Chain for Injection Molding of a 3D Component with Micro Pillars
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From Transparent to Opaque: A Route towards Multifunctional Parts Injected with a Single Material.

Luís D Pedroso1, António J Pontes1, António Alves2

  • 1Department of Polymer Engineering, Institute for Polymers and Composites (IPC), University of Minho, 4800-058 Guimarães, Portugal.

Materials (Basel, Switzerland)
|September 28, 2023
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Summary

This study explores using polypropylene (PP) injection molding to create parts with varying transparency. Researchers found that controlling cooling rates and crystalline structures influences haze, enabling tailored optical properties for easier recycling.

Keywords:
circular economygraded propertyhazeinjection moldingpolypropylenerecyclingsustainabilitytransparency

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Area of Science:

  • Materials Science
  • Polymer Engineering
  • Sustainable Manufacturing

Background:

  • Increasing consumption necessitates sustainable material solutions.
  • Multi-material components pose significant recycling challenges.
  • Reducing material variety in multifunctional parts aids recyclability.

Purpose of the Study:

  • To assess polypropylene (PP) injection molding grades for producing parts with controlled transparency gradients.
  • To investigate the influence of processing conditions on PP optical properties.
  • To identify PP grades suitable for creating variable haze components.

Main Methods:

  • Injection molding of various PP grades under different thermal conditions (injection and mold temperatures).
  • Characterization of optical properties (haze) of molded parts.
  • Analysis of crystalline structures using Differential Scanning Calorimetry (DSC) and Polarized Light Microscopy.

Main Results:

  • Identified PP grades DR 7037.01 (29.2-68.7% haze) and PP070G2M (>75% haze) as promising for haze variation.
  • Processing conditions influenced spherulite size and crystalline zones (α and β).
  • Haze variation was primarily attributed to internal layers with differing birefringence and refractive indices.

Conclusions:

  • Polypropylene can be processed to achieve tunable transparency gradients.
  • Controlling cooling rates and resulting crystalline morphology impacts haze.
  • Internal structural variations, not just spherulite size, are key to controlling haze in PP components.