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Related Concept Videos

Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta catalyst, high molecular...
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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...

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Analysis and Advances in Additive Manufacturing as a New Technology to Make Polymer Injection Molds for World-Class

Adrian Benitez Lozano1,2, Santiago Henao Álvarez1, Carlos Vargas Isaza1

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Summary

Additive Manufacturing (AM) offers a flexible alternative to traditional methods for creating customized polymer molds. This review compares AM polymer molds with conventional metal molds, highlighting AM's advantages in cost and cycle time.

Keywords:
injection moldingmold additive manufacturingmold characterizationpolymer moldsrapid toolingsubtractive manufacturing

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Area of Science:

  • Manufacturing Engineering
  • Materials Science
  • Polymer Science

Background:

  • Growing demand for customized metallic and polymeric products necessitates advanced manufacturing.
  • Additive Manufacturing (AM) enables complex geometries and rapid production cycles.
  • AM is increasingly utilized for developing polymer molds in product manufacturing.

Purpose of the Study:

  • To review and compare polymer molds created by AM with conventional metal molds.
  • To address knowledge gaps regarding materials, mechanical properties, designs, and costs.
  • To highlight the advantages of AM for mold production.

Main Methods:

  • Literature review of existing research on AM polymer molds and subtractive manufacturing metal molds.
  • Analysis of data concerning material characterization, mechanical properties, design considerations, and cost-effectiveness.
  • Synthesis of findings to provide a comprehensive overview.

Main Results:

  • AM allows for the creation of customized products with complex geometries and shorter lead times.
  • AM polymer molds offer reduced costs and cycle times compared to traditional methods.
  • Identified gaps in literature concerning specific material characterization, mechanical properties, and cost analysis for AM molds.

Conclusions:

  • Additive Manufacturing presents a desirable and advantageous alternative for polymer mold production.
  • Further research is needed to fully characterize AM molds and optimize their application.
  • AM technology is crucial for adapting to evolving manufacturing demands and enabling flexible product customization.