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Multilayer Diffusion Barrier Coatings on Poly(propylene) with Improved Temperature Durability
Author(s) -
Körner Lutz,
Sonnenfeld Axel,
Rudolf von Rohr Philipp
Publication year - 2009
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.200931705
Subject(s) - materials science , hexamethyldisiloxane , composite material , diffusion , fourier transform infrared spectroscopy , layer (electronics) , ultimate tensile strength , amorphous solid , attenuated total reflection , diffusion barrier , analytical chemistry (journal) , chemical engineering , crystallography , organic chemistry , chemistry , physics , plasma , quantum mechanics , engineering , thermodynamics
The improvement of temperature durability for autoclaving of silicon oxide (SiO x ) diffusion barrier coatings on poly(propylene) (PP) by deposition of thin amorphous hydrogenated carbon‐nitrogen (a‐C:N:H) intermediate layers was investigated. Attenuated total reflection Fourier transform infrared (ATR‐FTIR) spectroscopy revealed terminating amino and nitrile groups responsible for low compressive stress in a‐C:N:H. Uniaxial tensile tests showed a higher crack onset strain (COS) for a‐C:N:H of 2.7% compared to 0.7% for SiO x . Best temperature durability was achieved by a three‐layer coating from a‐C:N:H, an intermediate layer deposited by a mixture of N 2 , C 2 H 2 , hexamethyldisiloxane (HMDSO), and a SiO x layer. The oxygen transmission rate (OTR) was only increased from 6 to 22 cm 3 ·m −2 ·d −1 ·bar −1 after exposure to 140 °C for 30 min, whereas for single SiO x barrier coatings, severe loss of barrier properties of 1 040 cm 3 ·m −2 ·d −1 ·bar −1 was evidenced due to the formation of cracks.