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Related Concept Videos

Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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...
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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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Optimization of Polymer Processing: A Review (Part I-Extrusion).

António Gaspar-Cunha1, José A Covas1, Janusz Sikora2

  • 1Institute of Polymers and Composites, University of Minho, Campus de Azurém, 4804-533 Guimarães, Portugal.

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This review explores optimization methods for polymer processing, focusing on extrusion. It identifies effective techniques suitable for industrial application without requiring extensive computational resources.

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Area of Science:

  • Polymer Science and Engineering
  • Chemical Engineering
  • Materials Science

Background:

  • The polymer industry holds significant global economic and societal importance.
  • Continuous improvement of polymer processing techniques is crucial for practical applications.

Purpose of the Study:

  • To evaluate the application of optimization methodologies in main polymer processing operations.
  • To identify key features of optimization systems for polymer processing and define optimal procedures for specific situations.

Main Methods:

  • Literature review of state-of-the-art optimization methodologies.
  • Analysis of optimization techniques applied to major polymer processing techniques, focusing on extrusion (single/twin-screw extruders, dies, calibrators).
  • Discussion of objective function nature, algorithm types, modeling approaches, and parameters for optimization.

Main Results:

  • Identified a core set of optimization methodologies applicable to polymer processing.
  • Demonstrated that these methods offer good performance.
  • Confirmed that these techniques do not necessitate demanding computational requirements.

Conclusions:

  • A selection of optimization methodologies can be confidently applied to polymer processing.
  • These methods are effective and computationally efficient for extrusion processes.
  • Further research can build upon these findings for broader polymer processing optimization.