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A Multi-Scale Approach to Microencapsulation by Interfacial Polymerization.

Fabián Ricardo1, Diego Pradilla1, Ricardo Luiz2

  • 1Grupo de Diseño de Productos y Procesos (GDPP), Department of Chemical and Food Engineering, Universidad de los Andes, Bogotá 111711, Colombia.

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Summary
This summary is machine-generated.

This study optimizes microencapsulation by examining molecular, microscopic, and macroscopic factors. Increased amine functionality enhances microcapsule strength and appearance, while high amine concentrations can cause agglomeration.

Keywords:
aggregationcompressive strengthcontrolled releaseinterfacial polymerizationmicroencapsulationmulti-scale analysis

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Polymer Chemistry

Background:

  • Microencapsulation via interfacial polymerization is crucial for delivering fertilizers, pesticides, and drugs.
  • Optimizing microcapsule properties requires understanding variations across molecular, microscopic, and macroscopic scales.
  • Simultaneous consideration of product and process variables is key to effective microcapsule design.

Purpose of the Study:

  • To investigate the impact of formulation, composition, and pH on microcapsule properties.
  • To evaluate a novel method for measuring microcapsule compressive strength.
  • To explain microcapsule aggregation phenomena based on reaction kinetics and thermodynamics.

Main Methods:

  • Multi-scale analysis of microencapsulation by interfacial polymerization.
  • Quantification of formulation, composition, and pH effects on microcapsule characteristics.
  • Testing a suspension-based method for assessing microcapsule compressive strength.

Main Results:

  • Higher amine functionality leads to stronger crosslinking, reducing xylene release rate and improving microcapsule compression force and appearance.
  • High initial amine concentrations result in elevated pH, causing microcapsule agglomeration.
  • The tested compressive strength measurement method showed low sensitivity to formulation and composition differences.

Conclusions:

  • Microcapsule properties are significantly influenced by amine functionality, crosslinking, and pH.
  • Aggregation can be explained by kinetic and thermodynamic controls during polymerization.
  • The pH measurement method is unsuitable for studying polymerization kinetics due to accounting for side reactions like carbamate formation.
  • The developed compressive strength test requires further refinement for practical application in formulation analysis.