Sum frequency generation spectroscopic studies on phase transitions of phospholipid monolayers containing poly(ethylene oxide) lipids at the air-water interface

Article Abstract:

The vibrational sum frequency generation (SFG) spectroscopy is employed to investigate and explore the phase transitions of several phospholipid monolayers containing poly(ethylene oxide) lipids at the air-water interface. The results indicate that the mixed monolayers exist in pancake, mushroom or the brush state, wherein the mushroom-brush transition accompanies the conversion of the alkyl group from an irregular structure to the all-trans structure.

Science & research, Research, Phase transformations (Statistical physics), Phase transitions (Physics), Phospholipids, Monomolecular films, Structure, Report

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Structural changes and chain radius of gyration in cold-drawn polyethylene after annealing: Small- and wide-angle X-ray scattering and small-angle neutron scattering studies

Article Abstract:

The structural changes of the crystalline lamellae and lamellar superstructures and the single chain radius of gyration of cold-drawn polyethylene, after annealing, is studied by means of combined small- and wide angle X-ray scattering and small-angle neutron scattering (SANS). It is observed that the global anisotropic shape of the chains is preserved even after prolonged annealing, and that the mobility of polyethylene chains is a local phenomenon.

Analysis, Neutrons, Neutron scattering

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Preparation of nanosheet polyethylene with heterogeneous metallocene catalyst and formation mechanism of nanosheet polyethylene

Article Abstract:

The nanosheet polyethylene (PE) is prepared with silica-supported metallocene catalyst and the effect of the polymerization conditions on the morphology of the resultant PE is investigated. The silica is found to break up into sheet fragments instantaneously during polymerization, whereas the polyethylene could replicate it to obtain nanosheet polyethylene, and a possible formation mechanism of the nanosheet polyethylene is proposed.

Usage, Metallocenes, Fourier transform infrared spectroscopy

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