POLY-PARA-XYLENE Parylene

This polymer is obtained by an addition reaction of para-xylene, via pyrolysis at extremely high temperatures. It was developed in 1965 and various modifications have appeared since then. It is an engineering polymer for specific applications, withstanding elevated temperatures (softening between 260 C and 400 C). 

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Poly (para-xylene)—Parylene (trade name)... 

Micro-PCR is normally achieved in PC, Si, and glass but not PDMS because of its porosity. However, with a parylene (or poly-para-xylene) coating, problems of bubble formation, sample evaporation, and even protein adsorption are solved. In addition, no BSA or PEG additive is needed in the PCR mixture for dynamic coating because the parylene coating (4.5 pm thick) is hydrophobic. This can be... 

Paralene [para-xylene] Also called Gorham and also spelled parylene. A process for coating articles with poly-p-xylene. The vapor of di-p-xylylene is pyrolyzed at 550°C, yielding p-xylyl free radicals, -CHj-CgH CH, which deposit and polymerize on cooled surfaces. Developed by W. F. Gorham at Union Carbide Corporation. 

The other commercially available members of this gronp are Parylene C and Parylene D. Parylene C is poly-mono-chloro-para-xylylene. Parylene C offers significantly lower permeability to moisture and gases, such as nitrogen and oxygen, while retaining excellent electrical properties. Parylene D is poly-dichloro-para-xylene. Properties of Parylene N, C, and D are shown in Table P.3. 

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