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Related Concept Videos

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Polymers: Molecular Weight Distribution01:10

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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.
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Polymer Classification: Stereospecificity01:26

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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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Polymer Classification: Architecture01:14

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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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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Selective Depolymerization for Sculpting Polymethacrylate Molecular Weight Distributions.

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Reversible-deactivation radical polymerization (RDRP) enables controlled polymer depolymerization. This study shows selective depolymerization of poly(butyl methacrylate) (PBMA) can alter material properties and even encrypt data.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Reversible-deactivation radical polymerization (RDRP) allows for controlled polymer synthesis.
  • Chain-end reactivation offers a method for triggering depolymerization at lower temperatures.

Purpose of the Study:

  • To investigate the selective depolymerization of poly(butyl methacrylate) (PBMA) using chain-end reactivation.
  • To demonstrate the ability to control molecular weight distribution (MWD) and viscoelastic properties of PBMA blends.
  • To explore the potential for data encryption using polymer blends.

Main Methods:

  • Synthesis of PBMA via RDRP with thermally active chain ends.
  • Selective depolymerization of PBMA blends with varying molecular weights.
  • Characterization of MWD and viscoelastic properties before and after depolymerization.

Main Results:

  • Selective depolymerization effectively skewed the MWD of PBMA blends.
  • Controlled alterations in viscoelastic properties were achieved through depolymerization.
  • A proof-of-concept demonstrated data encryption by encoding Morse code within MWD changes.

Conclusions:

  • Chain-end reactivation is a viable strategy for tunable polymer modification.
  • This method enables "destructive strengthening" by altering material properties.
  • Polymer blends can serve as a medium for information storage.