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In situ IR Spectroscopy as a Tool to Better Understand the Growth Mechanisms of Plasma Polymers Thin Films
Author(s) -
Ligot Sylvie,
Thiry Damien,
Cormier PierreAntoine,
Raynaud Patrice,
Dubois Philippe,
Snyders Rony
Publication year - 2015
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201400193
Subject(s) - x ray photoelectron spectroscopy , plasma polymerization , polymer , fourier transform infrared spectroscopy , plasma , materials science , polymerization , thin film , ethyl lactate , spectroscopy , analytical chemistry (journal) , reactivity (psychology) , in situ , polymer chemistry , chemical engineering , chemistry , organic chemistry , nanotechnology , catalysis , composite material , medicine , physics , alternative medicine , pathology , quantum mechanics , engineering
Aiming to get a better understanding of the growth mechanism during the plasma polymerization process of ethyl lactate, the surface reactivity of ester‐bearing fragments has been determined by combining in situ FTIR spectroscopy and XPS measurements. While the plasma density of the reactive ester‐bearing fragment decreases by one order of magnitude (from ∼2 × 10 20 m −3 to ∼2 × 10 19 m −3 ) as the power increases from 60 to 280 W, the ester group density in the plasma polymer films decreases from ∼1.5 × 10 19 m −2 /m2 to ∼1.7 × 10 18 m −2 . The associated incorporation efficiency of the reactive ester‐bearings fragments in the films ( σ ester ) consequently increases from 2.6 × 10 −6 to 1.3 × 10 −4 when increasing the power. This behavior is attributed to higher activation the growing film surface.