Abstract
Plasma co-polymers (co-p) were deposited with an atmospheric pressure plasma jet (APPJ) using a precursor mixture containing hexamethyldisiloxane (HMDSO) and limonene. A coating with fragments from both precursors and with siloxane, carbonyl and nitrogen functional groups was deposited. The flow rate of limonene was found to be an important parameter for plasma co-polymerization to tune the formation and structure of the functional groups. The FTIR and XPS analysis indicates that with increasing flow rate of limonene a higher proportion of carbon is bound to silicon. This is related to a stronger incorporation of fragments from limonene into the siloxane network and a weaker fragmentation of HMDSO. The formation mechanism of the nitroxide and carboxyl groups can be mainly differentiated into in-plasma and post-plasma reactions, respectively.
Highlights
IntroductionThe deposition of plasma polymer (pp) coatings is widely used for barrier coatings, adhesion promoters and protective coatings
To understand the mechanisms of co-polymerization of an organic precursor with an organosilicon precursor we study the differences and similarities in the chemical structure of homo-plasma polymerized and co-polymerized coatings using FTIR and X-ray photoelectron spectroscopy (XPS)
Plasma co-polymerization with an organosilicon (HMDSO) and organic precursor using an atmospheric pressure plasma jet (APPJ) operating with air was investigated for the first time
Summary
The deposition of plasma polymer (pp) coatings is widely used for barrier coatings, adhesion promoters and protective coatings. The coatings are used in industries such as automotive, electronics, food packaging and in the bio-medical field. To improve coating performance and to further broaden the applicability of pp coatings it is necessary to understand and control the deposition chemistry in order to create new applications. Over the last decades the deposition of pp coatings using atmospheric pressure plasmas has become established in industry and science [1,2,3]. The precursors are vaporized and injected as a gas into the plasma
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