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Related Concept Videos

Polymers: Defining Molecular Weight01:01

Polymers: Defining Molecular Weight

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Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight.  So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
The number average molecular weight (Mn) is the summation of the number...
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Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

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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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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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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

Polymer Classification: Architecture

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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Tuning Entanglement Molecular Weights with Ultrahigh-Molecular-Weight Polystyrenics.

Joshua D Marquez1, Kevin A Stewart1, Kaden C Stevens1

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Researchers developed a new method to create ultrahigh-molecular-weight styrenic polymers with adjustable properties. These advanced polymers offer enhanced mechanical strength and reprocessability, opening new material possibilities.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • Ultrahigh-molecular-weight (UHMW) polymers exhibit superior mechanical properties but are often difficult to synthesize and process.
  • Styrenic polymers are versatile but achieving UHMW characteristics with tunable properties remains a challenge.
  • Controlling entanglement molecular weight (M_e) is crucial for tailoring polymer viscoelasticity and thermomechanical behavior.

Purpose of the Study:

  • To develop a novel method for producing UHMW styrenic polymers with precisely tunable entanglement molecular weights (M_e).
  • To investigate the relationship between M_e, side-chain modification, and the resulting thermomechanical properties.
  • To demonstrate the processability and unique behaviors, such as fiber formation and shape memory, of these engineered polymers.

Main Methods:

  • Synthesis of UHMW styrenic copolymers using mild photoiniferter polymerization with alkoxy-functionalized styrenics and pentafluorostyrene (PFS).
  • Tuning M_e via pre- and post-polymerization modification of styrenic units with variable-length n-alkyl pendants.
  • Characterization of molecular weight, viscoelastic behavior, mechanical properties (Young's modulus), creep recovery, glass transition temperature (T_g), and processability.

Main Results:

  • Successfully produced UHMW styrenic polymers (>10^6 Da) with M_e tunable from 40,000-160,000 Da.
  • Achieved tunable Young's moduli (0.04-69 MPa) and excellent creep recovery (>50% at 125 °C) across a range of T_g (-14 to 52 °C).
  • Demonstrated room-temperature shape memory behavior and successful fiber processing due to high solution viscosity.

Conclusions:

  • A novel route to styrenic-backbone UHMW polymers with systematically engineered M_e and tunable thermomechanical properties has been established.
  • Side-chain engineering provides a powerful tool to control polymer viscoelasticity, enabling unique applications like shape memory materials.
  • The developed polymers offer a combination of high performance, reprocessability, and processability into advanced forms like fibers.