Dynamic disorder and conformer exchange in the crystalline monomer of polycarbonate

Article Abstract:

Measurements of chemical exchange events in the crystalline polycarbonate monomer 4,4'-isopropylidenediphenol (bisphenol A, BPA) via 2D 13C solid-state NMR shows slow, large-amplitude aromatic ring orientations. Experiments with multiple exchange times show that ring flips occur in all of the three unique conformers found in the crystalline unit cell of this compound, but in specific cases, two of the three unique molecules actually switch conformations.

All Other Basic Organic Chemical Manufacturing, Vinyl Chloride Monomer, Crystallization, Monomers, Atomic properties

---

Scaling aspects of the kinetics of thermally induced phase seperation in bisphenol a polycarbonate/poly(methyl methacrylate) blends

Article Abstract:

Phase seperation in blends of bisphenol A polycarbonate and poly(methyl methacrylate) is investigated on the microscopic scale by means of atomic force microscopy. The spindonal decomposition processes are strongly affected by the occurrence of chemical reactions between polycarbonate and poly(methyl methacrylate), which slows the growth rate of the dispersed phase and the surface roughening.

Industrial Organic Chemicals, Bisphenol-A, Cyclic Crude and Intermediate Manufacturing, Methyl methacrylate

---

Influence of polycarbonate flexibility on the annealing-induced phase separation of the hole transport molecule TPD in a model charge transport composite

Article Abstract:

Investigation of the phase separation induced by annealing of films containing TDP and two different types of polycarbonates is discussed. The depression of the T(sub g) is more pronounced in the case of the PCZ polycarbonate, which is conformationally more restricted.

Analysis, Charge transfer

Similar abstracts:

• Abstracts: Adsorption isotherm and freezing of Kr in a single cylindrical pore. High-pressure carbon monoxide adsorption on Pt(111) revisited: a sum frequency generation study
• Abstracts: Yields and migration distances of reducing equivalents in the radiolysis of silica nanoparticles. Magnetic modification of the external surfaces in the MCM-41 porous silica: synthesis, characterization and functionalization
• Abstracts: Size and charge effects on the binding of CO to small isolated rhodium clusters. A novel low-temperature adsorption state of nitric oxide on a Rh(111)-p(2x2)-CCH3 surface studied by reflection-absorption infrared spectroscopy and Auger electron spectroscopy

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