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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,...
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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 polymer...
Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.

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Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications
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Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications

Published on: August 28, 2015

Polymers in a vacuum.

J M Deutsch1

  • 1Department of Physics, University of California, Santa Cruz, California 95064, USA.

Physical Review Letters
|February 1, 2008
PubMed
Summary
This summary is machine-generated.

Isolated polymer molecules in a vacuum exhibit unique properties. Angular momentum conservation influences chain size, while monomer position correlations show oscillations dependent on chain length.

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Published on: November 2, 2011

Area of Science:

  • Polymer Physics
  • Theoretical Chemistry

Background:

  • Isolated polymer molecules in a vacuum are relevant in various scientific contexts.
  • Understanding their behavior is crucial for fundamental polymer science.

Purpose of the Study:

  • To investigate the properties of isolated polymer molecules in a vacuum.
  • To analyze the impact of angular momentum conservation on polymer chain size.
  • To study the time autocorrelation of monomer positions.

Main Methods:

  • Theoretical examination of polymer molecule properties in a vacuum.
  • Analysis of angular momentum conservation and its effects.
  • Detailed study of time autocorrelation functions for monomer positions.

Main Results:

  • Angular momentum conservation significantly alters average polymer chain size.
  • Monomer position autocorrelation for ideal chains exhibits oscillations proportional to chain length.
  • Short-range repulsive interactions reduce oscillations and accelerate relaxation.

Conclusions:

  • Angular momentum conservation is a key factor in determining the size of isolated polymer chains in a vacuum.
  • Polymer chain dynamics in a vacuum display oscillatory behavior influenced by chain length and interactions.