Abstract
In this work, we present the synthesis of an alternative precursor for chemical vapour deposition of parylene AF-4 to the widely used standard, octafluoro[2.2]paracyclophane. The standard precursor suffers from uncertainties in its supply chain and its synthesis is of low yield. A comparison between different reaction parameters and solvents is drawn by means of thermal, laboratory-scale and microwave-assisted reactions and quantitative nuclear magnetic resonance (qNMR) studies.
Highlights
Parylene AF-4 is a high-temperature stable polymer for conformal coatings with a broad field of applications [1,2,3]
We present the synthesis of an alternative precursor for chemical vapour deposition of parylene AF-4 to the widely used standard, octafluoro[2.2]paracyclophane
The standard precursor suffers from uncertainties in its supply chain and its synthesis is of low yield
Summary
Parylene AF-4 is a high-temperature stable polymer for conformal coatings with a broad field of applications [1,2,3]. We present the synthesis of an alternative precursor for chemical vapour deposition of parylene AF-4 to the widely used standard, octafluoro[2.2]paracyclophane. An alternative route to parylene AF-4 is to start with one of the intermediate synthetic products 1,4-bis(bromodifluoromethyl)benzene (2) as the CVD precursor [9].
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