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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

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Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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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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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...
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Synthesis and Characterization of Alkyne-Functionalized Photo-Cross-Linkable Polyesters.

Warrick Ma1, Xiaochu Ding2, Ying Chen3

  • 1Department of Chemistry and Chemical Biology, College of Arts and Sciences, Cornell University, Ithaca, New York 14853, United States.

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Summary

A novel elastomer synthesized from sebacic acid and functionalized with alkynes offers tunable properties. Rapid UV-triggered cross-linking via thiol-yne chemistry yields a material with soft tissue-like mechanics, degradability, and cytocompatibility.

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Area of Science:

  • Polymer Chemistry
  • Biomaterials Science
  • Click Chemistry

Background:

  • Development of advanced elastomers with tunable mechanical properties is crucial for biomedical applications.
  • Thiol-yne click chemistry offers efficient and rapid cross-linking under mild conditions.

Purpose of the Study:

  • To synthesize and characterize a novel alkyne-functionalized elastomer.
  • To investigate the cross-linking behavior and mechanical properties of the resultant elastomer.
  • To evaluate the in vitro degradability and cytocompatibility of the elastomer for potential biomedical use.

Main Methods:

  • Melt condensation polymerization to synthesize the alkyne-functionalized elastomer.
  • UV-triggered thiol-yne click chemistry for rapid cross-linking.
  • Photorheology and Nuclear Magnetic Resonance (NMR) spectroscopy to study cross-linking dynamics.
  • Mechanical testing to assess tissue-like properties.
  • In vitro degradation and cell viability assays to evaluate biocompatibility.

Main Results:

  • Successful synthesis of an alkyne-functionalized elastomer from sebacic acid, 1,3-propanediol, and alkyne-functionalized serinol.
  • Rapid and efficient cross-linking achieved using a low-power UV lamp via thiol-yne click chemistry.
  • The cross-linked elastomer exhibited mechanical properties comparable to human soft tissues.
  • Demonstrated in vitro degradability and good cytocompatibility, indicating potential for biological applications.

Conclusions:

  • The synthesized alkyne-functionalized elastomer is a promising biomaterial.
  • Thiol-yne click chemistry provides a rapid and effective method for cross-linking this elastomer.
  • The material's mechanical properties, degradability, and cytocompatibility support its potential use in tissue engineering and regenerative medicine.