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Related Concept Videos

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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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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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Radical Chain-Growth Polymerization: Chain Branching01:17

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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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.
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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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This study reveals that monomer rigidity and sequence randomness significantly influence random copolymer microphase segregation. Simulations show chain flexibility and chemical correlation dictate melt morphology, impacting phase transitions and domain structures.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Soft Matter Physics

Background:

  • Copolymers are crucial in soft materials and biological systems.
  • Traditional models often use flexible chain assumptions and mean-field approximations.
  • Monomer rigidity and concentration fluctuations become critical at small length scales, challenging existing theories.

Purpose of the Study:

  • To investigate the impact of finite monomer rigidity and concentration fluctuations on random copolymer microphase segregation.
  • To generate phase diagrams for random copolymers using simulation methods.
  • To understand how chain flexibility and chemical sequence influence copolymer phase behavior.

Main Methods:

  • Field-theoretic Monte Carlo simulations were employed.
  • The simulations modeled semiflexible polymers with random chemical sequences.
  • Phase diagrams were generated to analyze melt morphology.

Main Results:

  • Melt morphology is highly dependent on chain flexibility and chemical sequence correlation.
  • Chemically anti-correlated copolymers exhibit first-order phase transitions to lamellar structures.
  • Increasing chemical correlation softens phase transitions, leading to irregular microphase domains.
  • Deviations from mean-field theory were observed near phase transitions.

Conclusions:

  • Finite monomer rigidity and sequence randomness introduce frustration and heterogeneity in segregated copolymer phases.
  • Simulation results highlight the limitations of mean-field theory under specific conditions.
  • Understanding these factors is key for designing novel soft materials with tailored properties.