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Related Concept Videos

Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

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.
Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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...
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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...
Classification and Mechanical Properties of Synthetic Polymers01:28

Classification and Mechanical Properties of Synthetic Polymers

Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Modeling branched polyethylene: copolymers possessing precisely placed ethyl branches.

John C Sworen1, Jason A Smith, Jessica M Berg

  • 1The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, USA.

Journal of the American Chemical Society
|September 10, 2004
PubMed
Summary

Precise ethylene/1-butene (EB) copolymers with controlled branching were synthesized and structurally investigated. Increased branching in these copolymers led to lower melting points and heats of fusion, alongside increased defects.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Precise control over polymer architecture is crucial for tailoring material properties.
  • Ethylene/1-butene (EB) copolymers are important industrial polymers, but their precise structure-property relationships are not fully understood.
  • Traditional synthesis methods often yield random copolymers, limiting structural control.

Purpose of the Study:

  • To synthesize and structurally characterize model ethylene/1-butene (EB) copolymers with precisely controlled ethyl branch placement.
  • To investigate the impact of varying branch frequency on copolymer structure and thermal properties.
  • To compare the structural characteristics of these precisely synthesized copolymers with randomly synthesized ones.

Main Methods:

  • Step polymerization chemistry was employed to synthesize four model EB copolymers.
  • Structural characterization included analysis of primary and higher-level structures.
  • Thermal properties were assessed using differential scanning calorimetry (DSC).
  • Crystallinity and defects were investigated using infrared (IR) spectroscopy.

Main Results:

  • Model EB copolymers with ethyl branches at every 9th, 15th, and 21st carbon were successfully synthesized.
  • Melting points and heats of fusion decreased with increasing ethyl branch frequency.
  • DSC and IR spectroscopy indicated highly disordered crystal structures that accommodated ethyl branches.
  • EB copolymers exhibited high concentrations of kink and gauche defects, irrespective of branch frequency.

Conclusions:

  • Precise synthesis via step polymerization allows for controlled introduction of branches in EB copolymers.
  • Branch frequency significantly influences thermal properties and crystal disorder.
  • The presence of ethyl branches leads to significant structural defects, impacting material behavior.
  • These model copolymers provide valuable insights compared to traditional random copolymers.