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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Polymers02:34

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Aldol Condensation vs Claisen Condensation01:33

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Aldol condensation is an acid or base-catalyzed condensation between aldehydes or ketones to give an α,ꞵ-unsaturated carbonyl compound. A base-promoted condensation between ester molecules to produce a ꞵ-ketoester is known as the Claisen condensation. In the presence of a base, both reactions involve deprotonation of the acidic α hydrogen to produce the corresponding enolates. The nucleophilic enolates attack their respective nonenolized carbonyl compound forming a tetrahedral...
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Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Aldol Condensation with β-Diesters: Knoevenagel Condensation01:27

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The Knoevenagel condensation is an aldol-type reaction involving the condensation of aldehydes or ketones with active methylene compounds such as β-diesters to produce substituted olefins.
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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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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Hyperbranched Polymers by Light-Induced Self-Condensing Vinyl Polymerization.

Cansu Aydogan1, Mustafa Ciftci1,2, Yusuf Yagci1,3

  • 1Department of Chemistry, Faculty of Science and Letters, Istanbul Technical University, 34469, Maslak, Istanbul, Turkey.

Macromolecular Rapid Communications
|June 6, 2018
PubMed
Summary
This summary is machine-generated.

This review explores light-induced synthesis of hyperbranched polymers (HBPs), a versatile class of macromolecules. Photochemical methods offer precise control over HBP formation, overcoming limitations of traditional polymerization techniques.

Keywords:
SCVPhyperbranched polymerslightphotopolymerizationpolymer synthesis

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Area of Science:

  • Macromolecular Science
  • Polymer Chemistry
  • Organic Synthesis

Background:

  • Hyperbranched polymers (HBPs) are dendritic macromolecules with unique properties like high solubility and terminal functionality.
  • Traditional synthesis methods (step-growth, SCVP) have limitations in control and efficiency.
  • Limited research exists on employing light-induced processes for HBP synthesis.

Purpose of the Study:

  • To review conventional methods for HBP synthesis.
  • To highlight the advantages of photochemical methods for HBP preparation.
  • To discuss photoinduced self-condensing vinyl polymerization (SCVP) and its associated inimers.

Main Methods:

  • Brief summary of traditional HBP synthesis strategies.
  • Detailed exploration of photoinduced self-condensing vinyl polymerization (SCVP).
  • Analysis of inimers and their functionalities in photochemical HBP synthesis.

Main Results:

  • Photochemical methods offer superior spatial and temporal control over polymerization.
  • Light-induced processes provide site-specific activation and operate at lower energy.
  • Novel strategies for preparing HBPs via photoinduced SCVP are presented.

Conclusions:

  • Photoinduced SCVP is a promising alternative for controlled HBP synthesis.
  • Inimers play a crucial role in the efficiency and characteristics of photochemical HBP formation.
  • This review provides insights into advanced strategies for synthesizing functional hyperbranched polymers.