Publication

Templating porosity in polymethylsilsesquioxane coatings using trimethylsilylated hyperbranched polymers

Jan-Anders Edvin Maansson, John Christopher Plummer, Quoc Tuan Nguyen
2002
Journal Articles

Abstract

A series of trimethylsilyl end-functionalized aliphatic hyperbranched polymers has been used to template porosity in polymethylsilsesquioxane films prepared by heat treatment of a spin cast methylsilsesquioxane precursor. By varying the extent of the end-functionalization, closed pore foams with controlled pore sizes and pore contents of up to 40 vol% were obtained by chemically-induced phase separation and thermal degradation of the hyperbranched polymers during the heat treatment.

Official source

https://infoscience.epfl.ch/entities/publication/5e416a1a-dbeb-435e-91b6-0273e5859c27

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Jan-Anders Edvin Maansson, John Christopher Plummer, Quoc Tuan Nguyen
2002
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/5e416a1a-dbeb-435e-91b6-0273e5859c27

About this result

Related concepts (16)

Porosity

Porosity or void fraction is a measure of the void (i.e. "empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and 100%. Strictly speaking, some tests measure the "accessible void", the total amount of void space accessible from the surface (cf. closed-cell foam). There are many ways to test porosity in a substance or part, such as industrial CT scanning.

Heat exchanger

A heat exchanger is a system used to transfer heat between a source and a working fluid. Heat exchangers are used in both cooling and heating processes. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries, natural-gas processing, and sewage treatment.

Heat sink

A heat sink (also commonly spelled heatsink) is a passive heat exchanger that transfers the heat generated by an electronic or a mechanical device to a fluid medium, often air or a liquid coolant, where it is dissipated away from the device, thereby allowing regulation of the device's temperature. In computers, heat sinks are used to cool CPUs, GPUs, and some chipsets and RAM modules.