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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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Polymer Classification: Crystallinity01:21

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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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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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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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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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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Order and Disorder in ABCA' Tetrablock Terpolymers.

Madalyn R Radlauer1,2, Akash Arora3, Megan E Matta1

  • 1Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States.

The Journal of Physical Chemistry. B
|November 2, 2020
PubMed
Summary

Self-assembly of poly(styrene)-block-poly(isoprene)-block-poly(lactide)-block-poly(styrene) (SILS) tetrablock terpolymers was studied. Adding a polystyrene end-block to low-molecular-mass precursors induced disorder, while higher-mass precursors maintained order, aligning with self-consistent field theory predictions.

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Area of Science:

  • Polymer Science and Engineering
  • Materials Science
  • Soft Matter Physics

Background:

  • Block copolymers exhibit complex self-assembly behavior driven by polymer segment incompatibility.
  • Tetrablock terpolymers with an ABCA' architecture present unique self-assembly challenges due to multiple block interactions.
  • Understanding self-assembly is crucial for designing advanced materials with tailored morphologies.

Purpose of the Study:

  • To investigate the self-assembly of poly(styrene)-block-poly(isoprene)-block-poly(lactide)-block-poly(styrene) (SILS') tetrablock terpolymers.
  • To explore the influence of terminal polystyrene chain length on the morphology of SILS' polymers.
  • To compare experimental self-assembly results with predictions from self-consistent field theory (SCFT).

Main Methods:

  • Synthesis of SILS' tetrablock terpolymers based on varying molar masses of precursor SIL triblock polymers and terminal PS' chains.
  • Experimental characterization using transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS).
  • Theoretical modeling using self-consistent field theory (SCFT) to predict self-assembly behavior.

Main Results:

  • SCFT predicts that adding a terminal PS' chain to low-molar-mass SIL precursors can induce a disordered state.
  • Experimental results for low-molar-mass SILS' polymers confirmed a shift from ordered to disordered morphology with increasing PS' chain length.
  • Higher-molar-mass SILS' polymers showed microphase separation, with medium-mass polymers maintaining long-range order and higher-mass polymers exhibiting limited order.

Conclusions:

  • The addition of terminal polystyrene blocks significantly influences the self-assembly of SILS' tetrablock terpolymers.
  • Experimental findings align with SCFT predictions, particularly for lower-molar-mass systems.
  • Frustration in accessing well-ordered materials is a key consideration for ABCA'-type polymer self-assembly.