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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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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...
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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...
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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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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,...
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Molecular Weight of Step-Growth Polymers01:08

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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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Related Experiment Video

Updated: Aug 23, 2025

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
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Polysiloxane-Based Polyurethanes with High Strength and Recyclability.

Wencai Wang1,2,3, Xueyang Bai1, Siao Sun1

  • 1State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.

International Journal of Molecular Sciences
|October 27, 2022
PubMed
Summary
This summary is machine-generated.

This study developed strong, flexible polysiloxane-polyurethanes (Si-TPUs) for biomedical uses. These new materials show improved mechanical strength and durability, overcoming limitations of current flexible polysiloxanes.

Keywords:
high strengthmicrophase separationpolysiloxane-basedpolyurethanerecyclability

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomedical Engineering

Background:

  • Polysiloxanes offer flexibility and biocompatibility but lack mechanical strength for many applications.
  • Improving mechanical properties is crucial for expanding polysiloxane use in demanding fields.

Purpose of the Study:

  • To synthesize and characterize novel polysiloxane-based polyurethanes (Si-TPUs).
  • To investigate the impact of hard-segment content and soft-segment molecular weight on Si-TPU properties.
  • To enhance the mechanical strength and durability of polysiloxane materials.

Main Methods:

  • Chemical copolymerization of hydroxyl-terminated polydimethylsiloxane, 4,4'-dicyclohexylmethane diisocyanate (HMDI), and 1,4-butanediol.
  • Synthesis of thermoplastic polysiloxane-polyurethanes (Si-TPUs) with varying compositions.
  • Evaluation of material properties including microphase separation, mechanical strength, and regeneration cycles.

Main Results:

  • The synthesized HMDI-based Si-TPUs demonstrated good microphase separation and excellent mechanical properties.
  • Tensile strength reached 21.5 MPa for SiTPU-2K-39, surpassing other flexible polysiloxane materials.
  • SiTPU-2K-39 maintained significant tensile strength (80.9%) and elongation (94.6%) after three regeneration cycles.

Conclusions:

  • The developed Si-TPUs offer a promising combination of flexibility, biocompatibility, and enhanced mechanical strength.
  • These materials exhibit good processability and durability, making them suitable for advanced applications.
  • Potential applications include gas separation membranes, medical devices, and antifouling coatings.