Effects of atmospheric pressure helium/air plasma treatment on adhesion and mechanical properties of aramid fibers

Abstract

In order to investigate the effect of atmospheric pressure plasmas on adhesion between aramid bers and epoxy, aramid bers were treated with atmospheric pressure helium/ air for 15, 30 and 60 s on a capacitively-coupleddevice at a frequency of 5.0 kHz and He outlet pressure of 3.43 kPa. SEM analysis at 10 000£ magni cation showed no signi cant surface morphological change resulted from the plasma treatments. XPS analysis showed a decrease in carbon content and an increase in oxygen content. Deconvolution analysis of C1s, N1s and O1s peaks showed an increase in surface hydroxyl groups that can interact with epoxy resin. The microbond test showed that the plasma treatment for 60 s increased interfacial shear strength by 109% over that of the control (untreated). The atmospheric pressure plasma increased single ber tensile strength by 16-26%.

Hydrophobic surface modification of ramie fibers with ethanol pretreatment and atmospheric pressure plasma treatment

“…The tensile strength values of the plasma treated fibers often tended to be lower, which may be due to the introduction of cracks and pits on the fiber surface by plasma etching after long exposure to plasma. However, it has been shown that fiber strength could also be increased due to elimination of small defects by plasma etching [32]. In the current study, the reaction between ethanol and plasma could consume substantial amount of energy and thus reduce plasma etching effect on the ethanol pretreated fibers.…”

Improvement of mechanical properties of polylactic acid adhesion joints with bio‐based adhesives by using air atmospheric plasma treatment

“…The important decrease in the contact angle in the PLA samples treated with air atmospheric plasma and the wettability increase was mainly due to surface activation and roughness change. [30][31][32][33][34][35] ) with a surface energy of 37 mJ m -2 , it is possible triple the strength of the PLA-PLA adhesion joints. For higher nozzle-substrate distances, the atmospheric plasma treatment was less effective.…”

Atmospheric plasma application to improve adhesion of electrospun nanofibers onto protective fabric

“…Plasma consists of highly active charged species; electrons, ions, and radicals, and can create highly unusual environments to interact with material surfaces. Plasma treatment of polymer materials results in surface modification through various functionalizations such as etching, deposition, chain scission, and cross-linking [7][8][9][10][11][12].…”