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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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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.
Many natural and synthetic polymers are produced by...
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Types of Step-Growth Polymers: Polyesters01:20

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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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Anionic Chain-Growth Polymerization: Overview01:20

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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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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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Multiblock Poly-ε-Caprolactones: One-Step Synthesis toward Programmable Properties.

Ting Shen1, Kaicheng Deng1, Yuewei Chen2

  • 1MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310058, China.

Macromolecular Rapid Communications
|October 11, 2023
PubMed
Summary
This summary is machine-generated.

Janus polymerization enables controlled synthesis of poly-ε-caprolactone multiblock copolymers (MBCPs). Block length, controlled by monomer-to-catalyst ratio, dictates the material

Keywords:
bioprintingdegradationpolymer architecturesthermal propertiesviscosity

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Controlling monomer sequence in polymers is key for predictable structure-property relationships.
  • Synthesizing multiblock copolymers (MBCPs) with controlled architectures, especially via one-pot methods, remains a significant challenge.

Purpose of the Study:

  • To develop a facile method for synthesizing poly-ε-caprolactone multiblock copolymers (MBCPs) with tunable properties.
  • To investigate the influence of block length on the thermal, mechanical, rheological, and degradable characteristics of these MBCPs.

Main Methods:

  • Utilized Janus polymerization for the one-pot synthesis of poly-ε-caprolactone MBCPs from mixed monomers.
  • Varied the monomer-to-catalyst feed ratio to control block lengths.

Main Results:

  • Successfully synthesized poly-ε-caprolactone MBCPs with tailored properties.
  • Demonstrated that melting temperature, tensile strength, ductility, viscosity, and enzymatic degradability are directly governed by block length.
  • Established a clear correlation between polymer architecture and physicochemical properties.

Conclusions:

  • Janus polymerization offers a versatile route to MBCPs with predictable property control.
  • Block length is a critical design parameter for tuning the performance of poly-ε-caprolactone thermoplastic elastomers.