Publication detail

Effects of additives on atmospheric pressure gliding arc applied to the modification of polypropylene

JELINEK P. POLASKOVA K., JENIK F.,JENIKOVA Z., DOSTAL L., DVORAKOVA E., CERMAN J., SOURKOVA H., BURSIKOVA V., SPATENKA P., ZAJICKOVA L.

Original Title

Effects of additives on atmospheric pressure gliding arc applied to the modification of polypropylene

Type

journal article in Web of Science

Language

English

Original Abstract

The polypropylene (PP) strips were modified with the industrial gliding arc discharge working in air flow at 50 Hz. The experiments aimed at increased wettability and improved strength of the epoxy adhesive DP190 bond with PP. While working only in dry air, the deterioration of the plasma treatment uniformity was observed at higher treatment speeds than 100 mm/s. At the same time, the tensile strength of the adhesive bond and the atomic concentrations of O and N decreased whereas the water contact angle (WCA) measurement error in- creased. The fast camera measurements revealed that the PP surface was treated by the direct contact with active plasma filaments. The non-uniformity of the PP surface treatment for increased treatment speed can be explained by taking into account the stochastic character of the filament propagation direction and the characteristic time scales of the process. As an improvement of the gliding arc treatment technology a new geometry utilizing the gas cross flow was proposed with the help of gas dynamic simulations. The addition of argon cross flow led to an improvement of the treatment uniformity and, for the optimized conditions, the measured tensile strength of the adhesive bond to PP was 6.5 times higher than for the untreated PP sample. The treatments with the cross flow of argon mixed with water vapors and volatile organic compounds (VOCs), ethanol and isopropanol, did not increase the tensile strength of the adhesive joint even though the wettability was higher for the mixtures with VOCs. Since the concentration of functional groups measured by X-ray photoelectron spectroscopy was well correlated with the tensile strength of adhesive joints, WCA measurements cannot be used as the only parameter judging the success of the plasma treatment aimed at an improvement of adhesive joint strength.

Keywords

Gliding arc, Plasma treatment of polymers, PECVD, Gas dynamics simulations, Plasma diagnostics, Surface characterization methods

Authors

JELINEK P.; POLASKOVA K., JENIK F.,JENIKOVA Z., DOSTAL L., DVORAKOVA E., CERMAN J., SOURKOVA H., BURSIKOVA V., SPATENKA P., ZAJICKOVA L.

Released

25. 8. 2019

ISBN

0257-8972

Periodical

Surface and Coatings Technology

Number

372

State

Swiss Confederation

Pages from

45

Pages to

55

Pages count

11

URL

https://www.sciencedirect.com/science/article/pii/S0257897219304001

BibTex

@article{BUT159681,
  author="JELINEK P. and POLASKOVA K., JENIK F.,JENIKOVA Z., DOSTAL L., DVORAKOVA E., CERMAN J., SOURKOVA H., BURSIKOVA V., SPATENKA P., ZAJICKOVA L.",
  title="Effects of additives on atmospheric pressure gliding arc applied to the modification of polypropylene",
  journal="Surface and Coatings Technology",
  year="2019",
  number="372",
  pages="45--55",
  doi="10.1016/j.surfcoat.2019.04.035",
  issn="0257-8972",
  url="https://www.sciencedirect.com/science/article/pii/S0257897219304001"
}