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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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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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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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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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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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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Main-Chain Azobenzene Poly(ether ester) Multiblock Copolymers for Strong and Tough Light-Driven Actuators.

Chong He1,2, Yang Xiao1, Sheng Wang1

  • 1Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.

ACS Applied Materials & Interfaces
|October 9, 2024
PubMed
Summary

Researchers developed novel photoresponsive polymer fibers from azobenzene multiblock copolymers. These strong, silk-like fibers exhibit fast light-induced bending and contraction, enabling applications in light-driven actuators and soft robotics.

Keywords:
PROPactuatorsazobenzenemultiblock copolymersphotoresponsive

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Area of Science:

  • Polymer Science
  • Materials Science
  • Robotics

Background:

  • Stimulus-responsive polymers are of great interest for actuators and soft robotics.
  • Photoresponsive materials offer remote manipulation capabilities.

Purpose of the Study:

  • To synthesize and characterize novel photoresponsive main-chain actuators.
  • To investigate the potential of azobenzene poly(ether ester) multiblock copolymers (mBCPs) for light-driven applications.

Main Methods:

  • Synthesis of mBCPs via cascade polycondensation-coupling ring-opening polymerization.
  • Preparation of oriented fibers using melt spinning.
  • Characterization of thermal, mechanical, and photoresponsive properties.

Main Results:

  • mBCPs exhibited tunable thermal, mechanical, and microphase separation behaviors.
  • Melt-spun fibers demonstrated high strength (~1000 MPa) and elongation at break, comparable to spider silk.
  • Fibers showed fast, reversible photoinduced bending and contraction, lifting up to 250 times their own weight.

Conclusions:

  • Azobenzene mBCP fibers are promising materials for light-driven actuators and telecontrolled robotic arms.
  • The developed materials offer high performance and remote manipulation capabilities for advanced applications.