Abstracts

Chemicals, plastics and rubber industries

Search abstracts:

High conversion synthesis of pyrene end functionalized polyrotaxane based on poly(ethylene oxide) and alpha-cyclodextrins

Article Abstract:

The quantitative synthesis of new pyrene labeled cyclodextrin-based polyrotaxane starting from pseudopolyrotaxane of alpha, omega-dimethacrylate poly(ethylene oxide) and alpha-cyclodextrins (alpha-CDs) is studied. The heterogenous medium with high coupling kinetics is found to be responsible for such a control of the polyrotaxane conversion and this reveals that both hydrogen bonding and packing density can explain rodlike structure of cyclodextrin-based polyrotaxane.

Methods, Nuclear magnetic resonance, Cyclodextrins

---

Poly (ethylene oxide): Electronic structure, energetics, and vibrational spectrum

Article Abstract:

The electronic structure, energetics, and vibrational spectrum of poly (ethylene oxide) (PEO) are determined from density functional theoretical calculations on model systems. The simulation of PEO by the finite size cluster approach utilizing oligo (ethylene oxide) model systems with six units, showed a good approximation to the calculation of electronic structure and vibrational spectra.

Electric properties, Density functionals, Density functional theory

---

Structure formation of hydrophobically end-capped poly(ethylene oxide) in the solid state

Article Abstract:

The conformational transitions of hydrophobically end-capped poly(ethylene oxide), hydrophobic-poly(ethylene oxide)-hydrophobic (HP-PEO-HP) is studied using different methods. It demonstrates the effects of the main chain and the solvent on the HP-PEO-HP crystallization process.

Observations, Hydrophobic effect

Similar abstracts:

• Abstracts: Thermodynamic properties of diblock copolymers of ethylene oxide and styrene oxide in aqueous solution. Behavior of a styrene oxide-ethylene oxide diblock copolymer/surfactant system: A thermodynamic and spectroscopy study
• Abstracts: Synthesis and characterization of organofunctionalized MCM-41 by the original stepped templated sol-gel technology
• Abstracts: Sonochemical preparation and characterization of Eu2O3 and TbO3 doped in and coated on silica and alumina nanoparticles
• Abstracts: Electroreduction of oxygen in a series of room temperature ionic liquids composed of group 15-centered cations and anions
• Abstracts: Performance of molecular orbital methods and density functional theory in the computation of geometries and energies of metal aqua ions

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.