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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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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: Mechanism01:04

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array
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Morphing metal-polymer janus particles.

Lewis M Cox1, Jason P Killgore, Zhengwei Li

  • 1Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO, 80309-0427, USA.

Advanced Materials (Deerfield Beach, Fla.)
|October 30, 2013
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate direct deformation and shape recovery of polystyrene particles using nanoimprint lithography. This method creates smart Janus particles with tunable conductivity and topography for advanced applications.

Keywords:
hierarchical wrinklesjanus particlessmart particles

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Science

Background:

  • Micron-sized particles are crucial in various scientific fields.
  • Developing methods for precise particle manipulation is essential for advanced material design.
  • Janus particles, with distinct surface properties, offer unique functionalities.

Purpose of the Study:

  • To report the direct deformation and shape recovery of micron-sized polystyrene particles.
  • To explore the creation of smart Janus particles with contrasting properties.
  • To investigate the use of metal-layer constrained recovery for programmed particle behavior.

Main Methods:

  • Utilizing nanoimprint lithography for direct particle deformation.
  • Employing metal-layer constrained recovery for shape programming.
  • Characterizing the resulting polystyrene (PS) particles for conductivity and topography.

Main Results:

  • Successfully achieved direct deformation and shape recovery of polystyrene particles.
  • Demonstrated the ability to create Janus particles with contrasting surface properties.
  • Showcased tunable conductivity and topography through controlled recovery processes.

Conclusions:

  • Nanoimprint lithography enables precise control over micron-sized polystyrene particle shape.
  • Metal-layer constrained recovery is an effective technique for programming particle properties.
  • The developed smart Janus particles hold potential for diverse applications requiring tailored functionalities.