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2453. Bishop, C.A., “Surface energy and adhesion for metallization,”, Sep 2012.

2597. Bishop, C.A., “Barrier polymers: Using Hansen Solubility Parameters fo rank barrier polymers,”, Jul 2014.

2599. Bishop, C.A., “Coating adhesion - To stick or not to stick? That is the question.,”, Jul 2014.

2618. Bishop, C.A., “Vacuum verbiage: How do nucleation, surface wetting affect thin-film crystal characteristics?,” Converting Quarterly, 5, 18-19, (Aug 2015).

2624. Bishop, C.A., “A problem of metal transfer,”, Feb 2016.

2645. Bishop, C.A., “Plasma treatment - inside knowledge,”, Jul 2016.

1935. Bismarck, A., D. Richter, C. Wuertz, M.E. Kumru, B. Song, and J. Springer, “Adhesion: Comparison between physico-chemical expected and measured adhesion of oxygen-plasma-treated carbon fibers and polycarbonate,” J. Adhesion, 73, 19-42, (May 2000).

The adhesive interaction between oxygen-plasma-treated, polyacrylonitrile-based, high-tensile-strength carbon fibers and a polycarbonate matrix has been studied. Several models have been used to predict the impact of the plasma treatment process on the strength of adhesion between both jointing partners. These approaches have been the thermodynamic work of adhesion which was calculated from the solid surface tensions, based on the results of contact angle measurements versus test liquids, the contact angle which was directly obtained via polycarbonate melt droplets on single carbon fibers and the zeta (ς)-potential data provided by streaming potential measurements. The results have been compared with the interfacial shear strength determined from the single-fiber fragmentation test. Additionally, the single-fiber tensile strength of the oxygen-plasma-treated carbon fibers was determined.

We confirmed that any physico-chemical method on its own fails to describe exactly the measured adhesion. However, for the investigated system, the conscientious interpretation of the data obtained from wetting measurements, in conjunction with the thermodynamic approach, is sufficient to predict the success of a modification technique which has been applied to one component in order to improve adhesion.

845. Bismarck, A., M.E. Kumru, and J. Springer, “Characterization of several polymer surfaces by streaming potential and wetting measurements: Some reflections on acid-base interactions,” J. Colloid and Interface Science, 217, 377-387, (Sep 1999).

Several thermoplastic (technical, engineering, and high-performance) polymers were characterized using contact angle and electrokinetic measurements. From the measured contact angles of various test liquids on polymers, we calculated the solid surface tensions using the different approaches to determine them and compared the results. Zeta (ζ)-potential measurements gave information about the swelling behavior of the polymers in water, the surface chemistry, and the interactions with dissolved potassium and chloride ions. All investigated polymers displayed an acidic surface character. Comparing the results obtained from the ζ-potential measurements with the acid-parameter of the surface tension γ+ calculated from the measured “static” contact angles using the van Oss, Good, and Chaudhury approach revealed the same tendency. The correctness of the acid–base approach regarding the “overall” chemical surface character could be shown. However, it seems that the basic parameter γ obtained from the acid–base is greatly overestimated.

2503. Bismarck, A., W. Brostow, R. Chiu, H.E.H. Lobland, and K.K.C. Ho, “Effects of surface plasma treatment on tribology of thermoplastic polymers,” Polymer Engineering & Science, 48, 1971-1976, (Oct 2008).

We have subjected polycarbonate (PC), low density polyethylene (LDPE), polystyrene (PS), polypropylene (PP), and Hytrel® (HY, a thermoplastic elastomer) to atmospheric pressure oxygen plasma treatment for varying amounts of time. Effects of the treatment have been evaluated in terms of the water wetting angle, dynamic friction, scratch resistance, and sliding wear. Although PS, PP, and HY do not undergo significant tribological changes as a result of the interaction with plasma, PC and LDPE show more pronounced and useful effects, such as a lowering of dynamic friction in PC and wear reduction in LDPE. These results can be explained in terms of the changes in chemical structures and increase of hydrophilicity. Based on the effects of oxygen plasma treatment on PC and LDPE, these two polymers have been subjected to longer oxygen plasma treatments and to argon, nitrogen, and air plasmas. Resulting effects on friction and scratch resistance are compared to determine the mechanisms responsible for the various surface behaviors. Chemical surface modification—as represented by changing contact angles—contributes to the tribological responses. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers

2486. Bismarck, A., and J. Springer, “Wettability of materials: Plasma treatment effects,” in Encyclopedia of Surface and Colloid Science, Somasundaran, P., ed., 6592, CRC Press, 2006.

2705. Blackman, B.R.K., and F.J. Guild, “Forced air plasma treatment for enhanced adhesion of polypropylene and polyethylene,” J. Adhesion Science and Technology, 27, 2714-2726, (2013).

This paper describes our investigation of the effects of forced air plasma treatment on polypropylene and polyethylene. The morphology of the treated surfaces has been carefully examined using a variety of tools including optical profiling. The complex surface morphology was observed to change with increasing treatment and varying intensity of the treatment over the surface. Optimum treatment conditions have been deduced using surface energy determinations and can be compared with the morphological changes. Determinations of surface energy, both the polar and non-polar components, have been made after exposure to varying moisture conditions for varying times. Different results are obtained for different environments and from different materials. These results demonstrate that forced air plasma treatment is a highly effective means of increasing the surface energy of polymers, which can be long-lasting, provided the treated surfaces are kept in dry conditions.

24. Blais, P., D.J. Carlsson, G.W. Csullog, and D.M. Wiles, “The chromic acid etching of polyolefin surfaces, and adhesive bonding,” J. Colloid and Interface Science, 47, 636-649, (1974).

23. Blais, P., D.J. Carlsson, and D.M. Wiles, “Effects of corona treatment on composite formation.Adhesion between incompatible polymers,” J. Applied Polymer Science, 15, 129+, (1971).

26. Blake, T.D., “Dynamic contact angles and wetting kinetics,” in Wettability, Berg, J.C., ed., 251-310, Marcel Dekker, Apr 1993.

1505. Blake, T.D., “The physics of moving wetting lines - a personal view,” Presented at ISCST 13th International Coating Science and Technology Symposium, Sep 2006.

2676. Blake, T.D., “An introduction to wetting and its relevance to coating,” Converting Quarterly, 7, (Jan 2017).

1101. Blake, T.D., R.A. Dobson, and K.J. Ruschak, “Wetting at high capillary numbers,” Presented at 12th International Coating Science and Technology Symposium, Sep 2004.

25. Blake, T.D., and K.J. Ruschak, “A maximum speed of wetting,” Nature, 282, 489-490, (1979).

726. Blake, T.D., and K.J. Ruschak, “Wetting: static and dynamic contact lines,” in Liquid Film Coating: Scientific Principles and Their Technological Implications, Kistler, S.F., and P.M. Schweizer, eds., 63-98, Chapman & Hall, Jan 1997.

Wetting is basic to coating. Initially air contacts the solid, and during coating the liquid displaces the air from the moving solid surface so that none is visible in the coated film. Thus, coating is a process of dynamic wetting. For uniform coating, the wetting line must remain straight and advance steadily. At sufficiently high speeds, however, the wetting line becomes segmented and unsteady as a thin air film forms between the solid and liquid. The air film disrupts the uniformity of the coated film, and often air bubbles appear in the coating. Dynamic wetting failure limits coating speed.

28. Blitshteyn, M., “Overview of technologies for surface treatment of polymers for automotive applications,” in International Congress and Exposition, Detroit, MI, Mar 1-5, 1993, Society of Automotive Engineers, Mar 1993.

This article reviews theoretical and practical aspects of electrical discharge plasma treatment for automotive parts at atmospheric pressure. Paints and bonding compounds adhere poorly to polyolefins because of their intrinsic non-polar chemical structure. Therefore, these materials require pretreatment before bonding and finishing to improve their adhesive properties. The electrical discharge plasma treatment at atmospheric pressure offers several advantages to automotive suppliers, such as the high treatment level, its repeatability and cost effectiveness, versatility of in-line processing, and the environmentally-safe nature of the process. Despite its increasing use, industry standards for surface treatment of plastic pa* have not been developed.

30. Blitshteyn, M., “Wetting tension measurements on corona-treated polymer films,” in 1994 Polymers, Laminations and Coatings Conference Proceedings, 189-195, TAPPI Press, Aug 1994 (also in TAPPI J., V. 78, p. 138-143, Mar 1995).

424. Blitshteyn, M., “Surface treatment of polyolefin parts with electrical discharge,” in Decorating Div. ANTEC, Society of Plastics Engineers, 1995.

1078. Blitshteyn, M., B.C. McCarthy, and T.E. Sapielak, “Electrical surface treatment improves adhesive bonding,” Adhesives Age, 37, 20-23, (Dec 1994).

27. Blitshteyn, M., and R. Wetterman, “Surface treatment of polyolefins,” Modern Plastics, 67, 424, (Oct 1990).

29. Blitshteyn, M., and R. Wetterman, “Testing for surface energy,” Converting, 11, 44-46, (Dec 1993).

1061. Blokhuis, E.M., “Liquid drops at surfaces,” in Surface and Interfacial Tension: Measurement, Theory, and Applications, Hartland, S., ed., 149-194, Marcel Dekker, 2004.

2409. Blose,F., and K. Dippmann, “Corona station for the preliminary processing of a strip material,” U.S. Patent 6320157, Nov 2001.

425. Blythe, A.R., D. Briggs, C.R. Kendall, D.G. Rance, and V.J. Zichy, “Surface modification of polyethylene by electrical discharge and the mechanism of autoadhesion,” Polymer, 19, 1273+, (Nov 1978).

1720. Bodine, J., “Overtreatment of PET: Fact or fiction,” in AIMCAL 2008 Fall Technical Conference, AIMCAL, Oct 2008.

2569. Bodine, J., “Over-treatment of PET - fact or fiction (part 1): A study of the following variables: watt density, corona dwell time, film selection, dyne level and water soak bond strength,” in 2008 PLACE Conference Proceedings, 794-801, TAPPI Press, Sep 2008.

1032. Bodio, F., N. Compiegne, L. Kohler, J.J. Pireauz, and R. Cuadano, “Tailoring the SiOx-polypropylene interface through plasma pretreatment: A test case for the acid-base concept,” in 20th Annual Anniversary Meeting, 41-44, Adhesion Society, 1997.

31. Bodo, P., and J.-E. Sundgren, “Adhesion of evaporated titanium to polyethylene: effects of ion bombardment pretreatment,” J. Vacuum Science and Technology, A2, 1498-1502, (1984).

Titanium films, 1 μm thick were electron‐beam evaporated onto polyethylene (PE) that had been pretreated in situ by 2 keV Ar+ bombardment. A measure of the film adhesion was obtained by measuring the pull strength required to remove the Ti films. A strong dependence of the adhesion on the ion dose was found. The pull strength had a maximum of approximately 20 MPa after a dose of 6×1014 ions/cm2 but decreased for higher ion doses. Without any ion bombardment prior to deposition, the adhesion was very poor with a pull strength of approximately 2 MPa. XPS analysis was used to examine the effect of the ion bombardment on the chemistry of the PE substrate and the Ti/PE interface. Untreated PE samples were contaminated with surface impurities and probably also with low molecular weight hydrocarbons. As the adhesion is maximized, most of the impurities are removed by the ion bombardment. The strong adhesion is suggested to be due to formation of a carbidelike Ti–C interfacial layer, detected by XPS.

32. Bodo, P., and J.-E. Sundgren, “Adhesion of evaporated titanium films to ion-bombarded polyethylene,” J. Applied Physics, 60, 1161-1168, (1986).

Ti films were deposited onto high‐density polyethylene (HDPE) samples by electron‐beam evaporation. Prior to film deposition the samples were in situ pretreated by Ar ion bombardment using a sputter ion gun. The adhesion of the films, determined as the pull strength required for film failure, was measured as a function of ion dose. HDPE substrates processed at two different temperatures were examined. The adhesion of the Ti films to HDPE samples processed at ≊150 °C increased with the ion dose to a steady‐state value corresponding to the cohesive strength of the HDPE substrate. The adhesion to the samples processed at ≊200°C increased to a maximum and then decreased for further ion bombardment to a level of the same order as that for films deposited onto as‐prepared samples. The effects of the ion bombardment upon the HDPE surface chemistry were examined by means of x‐ray photoelectron spectroscopy (XPS). The ion bombardment resulted in dehydrogenation and cross linking of the surface region and for prolonged ion bombardment, a graphitelike surface was obtained. The film/substrate interface as well as the initial Ti film growth were examined by XPS analysis. A chemical interaction which resulted in Ti–C bonds was observed at the interface. The Ti film growth followed a pronounced three‐dimensional growth mode on as‐prepared surfaces whereas the ion bombardment resulted in a change toward a more two‐dimensional growth mode. The difference in adhesion behavior for the two types of HDPE substrates was found to be due to a difference in the amounts of low molecular weight products present within the substrates. The HDPE substrates processed at ≊200°C contained larger amounts of low molecular weight products and also had a lower degree of crystallinity and a less closely packed structure compared to those substrates processed at ≊150°C. This resulted in a segregation of low molecular weight products towards the surface of substrates processed at ∼200 °C. This segregation in turn is suggested to lead to a weak boundary layer, reducing the adhesion to as‐prepared samples and to substrates exposed to a high ion dose.

2335. Boenig, H.V., Plasma Science and Technology, Cornell University Press, 1982.

426. Boenig, H.V., ed., Advances in Low-Temperature Plasma Chemistry, Technology, Applications, Technomic, 1988.

899. Boerio, F.J., “Surface analysis in adhesion science,” in Adhesion Science and Engineering: Vol. 1 - The Mechanics of Adhesion; Vol. 2 - Surfaces, Chemistry and Applications, Dillard, D.A., and A.V. Pocius, eds., 243-316(V2), Elsevier, Oct 2002.

3038. Bohra, H., P. Fleming, and M. Joyce, “Surfaces energy of coated paper: effect of calendering consitions and relative humidity,” in Proceedings of the Paper Con '09 Conference, 1987-2004, TAPPI Press, 2009.

2840. Bolanca, Z., and A. Hladnik, “Some properties of the anodized aluminum surface,” Presented at Proceedings of the 15th World Conference on Nondestructive Testing, Rome, Italy, Oct 2000.

33. Bonn, R., and J.J. van Aartsen, “Solubility of polymers in relation to surface tension and index of refraction,” European Polymer J., 8, 1055-1066, (1972).

34. Bonnerup, C., and P. Gatenholm, “The effect of surface energetics and molecular interdiffusion on adhesion in multicomponent polymer systems,” J. Adhesion Science and Technology, 7, 247-262, (1993) (also in Contact Angle, Wettability and Adhesion: Festschrift in Honor of Professor Robert J. Good, K.L. Mittal, ed., p. 753-768, VSP, Nov 1993).

The interfacial region of coated plastics is an example of a multicomponent polymer system. Practical adhesion, as determined by the peel test, has been found to be strongly dependent on the composition of the system and the degree of interaction between its components. Several interactions are possible during the coating process of polypropylene (PP)/ethylenepropylene-diene-monomer (EPDM) blends with chlorinated polyolefin (primer) and polyurethane (PUR) paint. Wettability, a necessary but not sufficient condition alone for molecular interdiffusion, was found to be good in all cases. The lack of interfacial adhesion between PP and PUR and between EPDM and PUR was explained by high interfacial tensions calculated from surface energetics, which, in turn, were determined by contact angle and inverse gas chromatography (IGC) measurements. The improvement of interfacial adhesion between PUR and PP by chlorinated polyolefin was explained by acid-base interactions detected by IGC. The creation of surface topography by extraction of low molecular weight fractions during the coating process does not influence the adhesion. Molecular interdiffusion was shown to be facilitated by solvents.


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