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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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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: 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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Characteristics and Nomenclature of Copolymers01:24

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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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Molecular Weight of Step-Growth Polymers01:08

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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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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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Determining paracrystallinity in mixed-tacticity polyhydroxybutyrates.

Daniel Van Opdenbosch1, Maria Haslböck1, Cordt Zollfrank1

  • 1Biogenic Polymers, Technical University of Munich, Campus Straubing for Biotechnology and Sustainability, Schulgasse 16, D-94315 Straubing, Germany.

Journal of Applied Crystallography
|April 9, 2021
PubMed
Summary
This summary is machine-generated.

This study presents a new method to distinguish microstrain and paracrystalline order in polyhydroxybutyrates using X-ray scattering. This improves the accuracy of material characterization for polymer science applications.

Keywords:
Rietveld refinementmixed tacticityparacrystallinitypolyhydroxybutyratesthermal factors

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Area of Science:

  • Polymer Science
  • Materials Science
  • Crystallography

Background:

  • Crystallinity determination in mixed-tacticity polyhydroxybutyrates is complex.
  • Literature values vary due to scattering from paracrystalline regions.
  • Distinguishing microstrain from paracrystalline order is challenging.

Purpose of the Study:

  • To develop a method to discern microstrain and paracrystalline order influences on peak shape.
  • To improve the accuracy of X-ray scattering analysis in polymers.
  • To validate obtained directional numbers through internal consistency.

Main Methods:

  • Utilized Rietveld refinement for peak profile analysis.
  • Developed a method to directionally discern microstrain and paracrystalline influences.
  • Allocated X-ray intensities to amorphous, bulk, and paracrystalline portions.

Main Results:

  • Successfully presented a method to differentiate microstrain and paracrystalline order.
  • Internal validation confirmed the accuracy of obtained directional numbers.
  • Discussed correlations between thermal factors and Young's moduli.

Conclusions:

  • The developed method enhances the understanding of polymer crystallinity.
  • Accurate characterization of paracrystalline portions is crucial for material properties.
  • Further research can explore the link between structural parameters and mechanical behavior.