Polymerization under High Pressure

The Polymerization of Ethylene under High Pressure using Semiconductor's model

By examining the process of heat transfer at tubular reactor for LD-PE synthesis, it can be concluded that free electrons exists during polymerization. Additionally, no free electrons occur in the absence of polymerization. A model that can explain and describe this behavior of ethylene under high pressure is the semiconductor model.

High-pressure induced polymerization of C60 nanorods

C60 nanorods, about 200 nm in diameter and several micrometers in length and with a rectangular cross section, have been synthesized by a simple solution-growth method. Raman spectroscopy and TEM indicate that the C60 nanorods have a fcc crystalline structure similar to that of pristine C60. Nanorods were polymerized at high temperature and high pressure below 2 GPa. Two different polymeric str...

High performance under pressure.

Nanomaterials under high-pressure.

The use of high-pressure for the study and elaboration of homogeneous nanostructures is critically reviewed. Size effects, the interaction between nanostructures and guest species or the interaction of the nanosystem with the pressure transmitting medium are emphasized. Phase diagrams and the possibilities opened by the combination of pressure and temperature for the elaboration of new nanomate...

Nitrogen oxides under pressure: stability, ionization, polymerization, and superconductivity

Nitrogen oxides are textbook class of molecular compounds, with extensive industrial applications. Nitrogen and oxygen are also among the most abundant elements in the universe. We explore the N-O system at 0 K and up to 500 GPa though ab initio evolutionary simulations. Results show that two phase transformations of stable molecular NO2 occur at 7 and 64 GPa, and followed by decomposition of N...