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Related Concept Videos

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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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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Step-Growth Polymerization: Overview01:03

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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.
Many natural and synthetic polymers are produced by...
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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Anionic Chain-Growth Polymerization: Overview01:20

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
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Study on GAP Adhesive-Based Polymer Films, Energetic Polymer Composites and Application.

Siyuan Wu1, Xiaomeng Li1, Zhen Ge1

  • 1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.

Polymers
|March 29, 2023
PubMed
Summary

Environmentally friendly energetic polymer composites were developed using glycidyl azide polymer (GAP) adhesive. Optimized curing parameters yielded a robust cross-linked network, enhancing mechanical properties for advanced material applications.

Keywords:
adhesiveenergetic polymer compositesmechanical propertiespolymer film

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Energetic Materials

Background:

  • Development of environmentally friendly energetic polymer composites is crucial for advanced applications.
  • Glycidyl azide polymer (GAP) offers potential as a binder in energetic materials.
  • Optimizing curing parameters and filler content is key to achieving desired material properties.

Purpose of the Study:

  • To investigate the effect of curing parameters (R) on GAP-based polymer films.
  • To evaluate the properties of energetic polymer composites incorporating RDX.
  • To establish a foundation for developing sustainable energetic polymer composites.

Main Methods:

  • Synthesis of GAP/TDI/GLY adhesive systems with varying R values.
  • Characterization of polymer films using tensile testing, LF-NMR, and FT-IR.
  • Preparation and testing of energetic polymer composites with different RDX contents.
  • Analysis of mechanical properties, cross-linking density, hydrogen bonding, and thermal behavior.

Main Results:

  • Polymer films with R=2.2 exhibited tensile strength of 14.34 MPa and elongation at break of 176.86%.
  • LF-NMR and FT-IR confirmed a complete cross-linking network and high hydrogen bonding.
  • Energetic composites with 40% RDX showed tensile strength of 4.65 MPa, elongation of 78.49%, and heat of explosion of 2.87 MJ/kg.
  • Low residue carbon rate (2.47%) was observed in the RDX-containing composites.

Conclusions:

  • Optimized curing parameters significantly enhance the mechanical properties and network structure of GAP-based polymer films.
  • Incorporating RDX into the GAP adhesive system results in energetic composites with balanced mechanical and explosive properties.
  • The study provides a foundation for designing environmentally friendly energetic polymer composites with tailored performance.