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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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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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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.
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Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
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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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Area of Science:

  • Polymer Science
  • Mechanochemistry
  • Materials Science

Background:

  • Polymer mechanochemistry is often studied using ultrasonication.
  • Force distribution is typically modeled as a parabola centered on the polymer chain.
  • The extent of force application towards polymer chain ends is not fully understood.

Purpose of the Study:

  • To investigate mechanochemical reactivity at defined locations along polymer chains, specifically towards the termini.
  • To understand the influence of mechanophore location and polymer chain length on mechanoactivation.
  • To overcome synthetic challenges in preparing polymers for such studies.

Main Methods:

  • Synthesis of block copolymers using living ring-opening metathesis polymerization.
  • Incorporation of a ladderene-type mechanophore and norbornene.
  • Control over block positions and lengths.

Main Results:

  • Terminal mechanophore blocks showed less activation than central blocks for polymers with DP ≈ 1000.
  • Extending the inert block length significantly increased activation of terminal mechanophore blocks (DP ≈ 200).
  • Terminal blocks achieved activation comparable to central blocks after an induction period.

Conclusions:

  • Forces under sonication cover a broad range along the polymer chain.
  • High degrees of mechanochemistry are achievable far from the chain center.
  • This work expands the understanding of force distribution and mechanophore activation in polymers.