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Related Concept Videos

Classification and Mechanical Properties of Synthetic Polymers01:28

Classification and Mechanical Properties of Synthetic Polymers

Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...
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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.
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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.
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Artificial Thermal Ageing of Polyester Reinforced and Polyvinyl Chloride Coated Technical Fabric
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Published on: January 29, 2020

Performance Prediction of Antiaging Aliphatic Polyurethane Topcoat.

Xueyun Xiang1, Tiancong Wang1, Jiangyan Liu1

  • 1Corrosion and Protection Center, Northeastern University, Shenyang 110819, P. R. China.

ACS Omega
|June 8, 2026
PubMed
Summary
This summary is machine-generated.

This study quantifies polyurethane coating aging using infrared spectroscopy and glossiness. Carbonyl group increases correlate with glossiness loss, providing a framework for predicting long-term durability under UV exposure.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Science

Background:

  • Polyurethane coatings offer excellent durability but their aging behavior is difficult to quantify.
  • Accelerated testing is crucial for predicting the service life of protective coatings.

Purpose of the Study:

  • To develop a quantitative method for evaluating the aging of aliphatic acrylic polyurethane topcoats.
  • To correlate surface chemical changes with glossiness degradation during accelerated aging.

Main Methods:

  • Accelerated cyclic aging tests were performed on two polyurethane topcoats.
  • Infrared spectroscopy was used to monitor changes in chemical structure, specifically carbonyl content.
  • Glossiness measurements were conducted to assess surface degradation.

Main Results:

  • The ratio of C=O/C-H band area increased with aging time, indicating carbonyl group formation.
  • A strong negative correlation was found between glossiness and carbonyl content (Spearman coefficients -0.772 and -0.782).
  • Glossiness decay followed an exponential function with extended UV exposure.

Conclusions:

  • The study provides a quantitative framework for assessing polyurethane coating aging.
  • The findings enable prediction of long-term durability based on carbonyl group formation and glossiness reduction.
  • This research aids in material selection and performance prediction for UV-exposed polyurethane applications.