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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
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Modelling pH-Optimized Degradation of Microgel-Functionalized Polyesters.

Lisa Bürgermeister1, Marcus Hermann2, Katalin Fehér3

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|October 25, 2017
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Summary
This summary is machine-generated.

A new mathematical model predicts pH stability in biodegradable polymers using VCL/AAEM/VIm microgels. This innovation addresses pH drops during degradation, crucial for medical applications.

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Area of Science:

  • Polymer Science
  • Biomaterials Engineering
  • Mathematical Modeling

Background:

  • Biodegradable polymers like polyesters are vital for medical devices (stents, scaffolds).
  • A major limitation in their application is the pH drop during degradation.
  • Poly(N-vinylcaprolactam-co-acetoacetoxyethyl methacrylate-co-N-vinylimidazole) (VCL/AAEM/VIm) microgels show promise for pH stabilization.

Purpose of the Study:

  • To develop a novel mathematical model for analyzing pH in the vicinity of microgel-functionalized polymers during biodegradation.
  • To predict the pH-stabilizing performance of VCL/AAEM/VIm microgels in biodegradable polymers.
  • To support the design of advanced microgel-functionalized polymer components for medical applications.

Main Methods:

  • A diffusion-reaction partial differential equation (PDE) system models polymer degradation and acid diffusion.
  • Reaction rate equations quantify degradation processes.
  • A system of algebraic equations simulates the microgel's buffering capacity.

Main Results:

  • The model accurately describes and analyzes pH dynamics near microgel-functionalized polymers.
  • Validation against experimental pH-monitored biodegradation confirms model efficacy.
  • The model provides a predictive tool for pH level evaluation in these systems.

Conclusions:

  • The established mathematical model is effective for predicting pH stabilization in biodegradable polymers functionalized with VCL/AAEM/VIm microgels.
  • This work enables the rational design of microgel-functionalized polymer components, overcoming limitations in medical applications.
  • The model is a valuable tool for advancing the use of biodegradable polymers in cardiovascular and drug delivery systems.