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Related Concept Videos

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Polymer Classification: Architecture01:14

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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Step-Growth Polymerization: Overview01:03

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Related Experiment Video

Updated: Oct 9, 2025

Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application
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Oxime-Urethane Structure-Based Dynamically Crosslinked Polyurethane with Robust Reprocessing Properties.

Yuan Lei1, Xiaowei Fu1, Liang Jiang1

  • 1State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, 610065, China.

Macromolecular Rapid Communications
|December 22, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel reprocessable polyurethane (DOPU) using reversible bonds. This advanced material offers excellent mechanical properties, solvent resistance, and recyclability, addressing polyurethane waste issues.

Keywords:
degradationdibutanone oxime-carbamate bondspolyurethanereprocessing

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Crosslinked polyurethanes are widely used but difficult to recycle due to permanent chemical crosslinks, leading to significant waste.
  • Developing recyclable and reprocessable polyurethanes is crucial for sustainability.

Purpose of the Study:

  • To synthesize a novel, reprocessable polyurethane (DOPU) with enhanced mechanical properties and environmental degradability.
  • To investigate the thermal recyclability and shape memory properties of the new material.

Main Methods:

  • Facile preparation of DOPU utilizing reversible dibutanone oxime-carbamate bonds.
  • Characterization of gel fraction, visible light transmittance, and mechanical properties after multiple thermal recycles.
  • Evaluation of elastic shape memory and permanent shape reconstruction capabilities.

Main Results:

  • DOPU exhibited a gel fraction over 95%, indicating excellent solvent resistance.
  • Visible light transmittance reached up to 97.48%.
  • Recycled DOPU retained significant tensile strength (3.21 MPa) and elongation at break (219.09%) after four cycles.
  • The material demonstrated excellent elastic shape memory and permanent shape reconstruction under thermal stimulation.
  • Degradability under UV irradiation was also confirmed.

Conclusions:

  • The synthesized DOPU offers a promising solution for recyclable and reprocessable polyurethane materials.
  • Its excellent mechanical properties, transparency, solvent resistance, and degradability make it suitable for various applications.
  • Potential applications include coatings, elastomers, and advanced functional materials.