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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,...
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,...
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,...
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,...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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...
Anionic Chain-Growth Polymerization: Overview01:20

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,...

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Self-supporting polymer from a POSS derivative.

Chih-Chia Cheng1, Ying-Chieh Yen, Feng-Chih Chang

  • 1Institute of Applied Chemistry, National Chiao-Tung University, Hsinchu 30050, Taiwan.

Macromolecular Rapid Communications
|May 5, 2011
PubMed
Summary
This summary is machine-generated.

A novel polyhedral oligomeric silsesquioxane macromer (POSS-C11-Py) self-assembles into a polymer-like material. This supermolecule exhibits excellent mechanical properties due to quadruple hydrogen bonding interactions.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Traditional polymers often face limitations in mechanical strength and stability.
  • Developing advanced materials with enhanced properties is crucial for technological innovation.
  • Supramolecular chemistry offers novel approaches to material design through self-assembly.

Purpose of the Study:

  • To synthesize and characterize a new polyhedral oligomeric silsesquioxane macromer (POSS-C11-Py).
  • To investigate the self-assembly behavior of POSS-C11-Py and its resulting material properties.
  • To explore the potential of POSS-C11-Py as a building block for advanced supramolecular materials.

Main Methods:

  • Synthesis of octakis[N-(6-aminopyridin-2-yl)undecanamide-10-dimethyl-siloxy]silsesquioxane (POSS-C11-Py).
  • Characterization of the macromer's structure and self-assembly properties.
  • Mechanical testing to evaluate tensile strength, modulus, and elongation.

Main Results:

  • POSS-C11-Py was successfully synthesized, featuring eight diaminopyridine arms.
  • The macromer self-assembles into a physically crosslinked structure via quadruple hydrogen bonding.
  • The resulting material demonstrated significant mechanical properties: tensile strength of 46.1 MPa, tensile modulus of 0.58 GPa, and elongation of 49.3%.

Conclusions:

  • POSS-C11-Py is the first organic/inorganic supermolecule with polymer-like mechanical properties derived from self-complementary interactions.
  • This research presents a promising pathway for designing and fabricating advanced polymer-like supramolecular materials.
  • The self-assembly mechanism offers a new strategy for creating materials with tunable mechanical performance.