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Related Concept Videos

Polymers02:34

Polymers

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 properties that they exhibit. Additionally,...
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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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Anionic Chain-Growth Polymerization: Overview

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,...
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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 generated carbocation,...

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Rendering poly(amidoamine) or poly(propylenimine) dendrimers temperature sensitive.

Yasuhiro Haba1, Atsushi Harada, Toru Takagishi

  • 1Department of Applied Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan.

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|October 8, 2004
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Summary

Researchers synthesized isobutyramide-terminated poly(amidoamine) dendrimers. Higher generation dendrimers showed lower critical solution temperatures, indicating efficient temperature-sensitive properties.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Poly(amidoamine) dendrimers are branched macromolecules with diverse applications.
  • Developing stimuli-responsive materials is crucial for advanced applications.
  • Controlling the properties of dendrimers through surface modification is an active research area.

Purpose of the Study:

  • To synthesize isobutyramide (IBAM)-terminated poly(amidoamine) dendrimers.
  • To investigate the effect of IBAM group density on dendrimer properties, specifically temperature sensitivity.
  • To evaluate the potential of IBAM functionalization for creating temperature-responsive polymers.

Main Methods:

  • Synthesis of IBAM-terminated poly(amidoamine) dendrimers (G2-G5) using isobutyric acid and 1,3-dicyclohexylcarbodiimide.
  • Characterization using Nuclear Magnetic Resonance (NMR) spectroscopy (1H and 13C) to confirm IBAM group attachment.
  • Determination of lower critical solution temperatures (LCSTs) by observing solubility changes with temperature.

Main Results:

  • Successful attachment of IBAM groups to the termini of poly(amidoamine) dendrimers across generations G2 to G5.
  • IBAM-terminated G2 dendrimer remained water-soluble.
  • IBAM-terminated G3, G4, and G5 dendrimers exhibited decreasing LCSTs of 75°C, 61°C, and 43°C, respectively.
  • A progressive increase in IBAM group density with higher generations correlated with a significant decrease in LCST.

Conclusions:

  • The density of terminal IBAM groups directly influences the lower critical solution temperature (LCST) of poly(amidoamine) dendrimers.
  • Increasing generation number leads to higher IBAM group density and enhanced temperature-sensitive behavior.
  • Functionalization with IBAM groups is an effective strategy for imparting temperature sensitivity to dendrimers, including poly(propylenimine) dendrimers.