Surface Activation of Polylactic Acid-Based Wood-Plastic Composite by Atmospheric Pressure Plasma Treatment

Sauerbier, Philipp; Kohler, Robert Ε.; Renner, Gerrit; Militz, Holger

doi:10.3390/ma13204673

Cited by 17 publications

(21 citation statements)

References 25 publications

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“…The effect of increasing surface hydrophilicity with plasma treatment is well known and expected. Sauerbier and co-authors [ 11 ] reported that water contact angles on a PLA-based wood-polymer composite (WPC) with 60% wood content decreased significantly after plasma treatment. A similar effect of plasmas is reported on ABS [ 15 ].…”

Section: Resultsmentioning

confidence: 99%

“…Proper surface adhesion is required for bonding and coating processes. The coating of AM produced parts is often necessary since the AM process leaves behind individual visual and haptic layers that have to be sanded, filled, sanded again and finally painted [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…Plasma treatments are promising techniques that enable rapid and chemical-free surface modifications [ 13 ]. Treatments of polymeric substrates with non-thermal plasma discharges in air increase the surface free energy and improve surface wettability, which is crucial for bonding with liquid water-based adhesives, thus improving the tensile strength of the adhesive bonds [ 11 , 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

“…In comparison with low-pressure RF and microwave plasmas, atmospheric techniques in general are preferable for many industrial applications including for polymer processing [ 31 ]. Sauerbier and co-workers [ 11 ] used a DBD operating in synthetic air at atmospheric pressure to treat injection molded PLA specimens. They thus achieved hydrophilization through the generation of oxygen-containing surface groups as well as through an increased surface roughness (i.e., a more developed interfacial area).…”

Section: Introductionmentioning

confidence: 99%

“…They thus achieved hydrophilization through the generation of oxygen-containing surface groups as well as through an increased surface roughness (i.e., a more developed interfacial area). This further led to increased adhesion of a water-based acrylic dispersion coating, from 1.4 to 2.3 N/mm 2 [ 11 ]. Due to the geometric limitations of DBD plasma devices, remote plasma technologies are used in many industrial sectors.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Sanding and Plasma Treatment of 3D-Printed Parts on Bonding to Wood with PVAc Adhesive

et al. 2021

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Additive manufacturing is becoming increasingly important for manufacturing end products, not just prototyping. However, the size of 3D-printed products is limited due to available printer sizes and other technological limitations. For example, making furniture from 3D-printed parts and wooden elements requires adequate adhesive joints. Since materials for 3D printing usually do not bond very well with adhesives designed for woodworking, they require special surface preparation to improve adhesion. In this study, fused deposition modelling (FDM) 3D-printed parts made of polylactic acid (PLA), polylactic acid with wood flour additive (Wood-PLA), and acrylonitrile-butadiene-styrene (ABS) polymers were bonded to wood with polyvinyl acetate (PVAc) adhesive. The surfaces of the samples were bonded as either non-treated, sanded, plasma treated, or sanded and plasma treated to evaluate the effect of each surface preparation on the bondability of the 3D-printed surfaces. Different surface preparations affected the bond shear strength in different ways. The plasma treatment significantly reduced water contact angles on all tested printing materials and increased the bond tensile shear strength of the adhesive used. The increase in bond strength was highest for the surfaces that had been both sanded and plasma treated. The highest increase was found for the ABS material (untreated 0.05 MPa; sanded and plasma treated 4.83 MPa) followed by Wood-PLA (from 0.45 MPa to 3.96 MPa) and PLA (from 0.55 MPa to 3.72 MPa). Analysis with a scanning electron microscope showed the smooth surfaces of the 3D-printed parts, which became rougher with sanding with more protruded particles, but plasma treatment partially melted the surface structures on the thermoplastic polymer surfaces.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%