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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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...
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...
Superplasticizers01:30

Superplasticizers

Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
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...
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...

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Updated: Jun 24, 2026

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
11:49

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application

Published on: March 8, 2019

Soft-Segment-Tuned Dynamic Polyurethanes With Low Compression Set and Recyclability.

Rui Bai1, Yuepeng Wang1, Yingqian Li2

  • 1State Key Laboratory of Advanced Fibers Materials, College of Materials Science and Engineering, Research Base of Textile Materials for Flexible Electronics and Biomedical Applications (China Textile Engineering Society), Shanghai Key Laboratory of Lightweight Composite, Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative Medicine, Donghua University, Shanghai, P. R. China.

Macromolecular Rapid Communications
|June 23, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed dynamic Diels-Alder cross-linked polyurethane elastomers (DAPU-EEs) that balance high performance and recyclability. These advanced materials offer improved mechanical properties and efficient reprocessing for sustainable applications.

Keywords:
Diels‐Alder reactiondynamic covalent cross‐linkinglow compression setpolyurethanerecyclable

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • High-performance polyurethane (PU) elastomers face a challenge balancing mechanical strength with recyclability.
  • Existing materials often compromise one property for the other.

Purpose of the Study:

  • To develop recyclable PU elastomers with high mechanical performance.
  • To investigate the structure-property relationships in PU elastomers with tailored soft segment ratios.
  • To create advanced materials for demanding sealing applications.

Main Methods:

  • Synthesized Diels-Alder (DA) dynamic covalently cross-linked PU elastomers (DAPU-EEs).
  • Precisely controlled polyether-to-polyester soft segment ratios.
  • Evaluated mechanical properties, thermal stability, and recyclability through hot-pressing cycles.

Main Results:

  • Optimized DAPU-EEs (DAPU-EE2) demonstrated excellent recyclability, retaining properties after multiple cycles.
  • Achieved a low compression set of 15%, outperforming commercial TPU sealing materials.
  • Exhibited superior solvent resistance and efficient processability with reduced viscosity.

Conclusions:

  • The developed DAPU-EEs offer a practical strategy for balancing mechanical performance and sustainable reprocessing.
  • These materials show significant potential for advanced sealing applications requiring durability and recyclability.