I. A. Starostina

Studies on the surface properties and the adhesion to metal of polyethylene coatings modified with primary aromatic amines

The surface free energy and acid-base characteristics of polyethylene coatings formed on steel in the presence of primary aromatic amines (PAAs) were investigated. PAAs were shown to interact with steel by a donor-acceptor mechanism. An increase in the coating adhesion is realized through chemical and physical bond formation between an adhesive and a substrate with the help of the PAA. The free surface energy of the contact-to-metal side of these coatings modified with PAA was shown to grow in parallel with the increase in adhesion. The results correlate with the data on polyethylene surface wetting with nonionic surfactants. Acid-base interactions were found to exert primary control over polyethylenes adhesion to steel.

On the Evaluation of the Acidity and Basicity Parameters of the Surface Free Energy of Polymers

Polymeric surfaces of polyvinylchloride and polymethylmethacrylate were found to be unsuitable when considered to be monopolar. The acid-base properties of these polymers were studied by using the Berger method, and their composition was analyzed by IR-spectroscopy and quantum chemical analysis. In order to determine the acidity and basicity parameters of the surface free energy (SFE) of smooth solid surfaces, the three-dimentional graphical method was proposed based on nonlinear Della Volpe modification of the van Oss-Chaudhury-Good equation.

Determination of free surface-energy parameters using a spatial method

A spatial method for determining acid and base parameters of the free surface energy of different solid surfaces using multidimensional approximation based on reduction of the van Oss-Chaudhury-Good equation to the equation of a plane is developed. The obtained results confirm the efficiency of the spatial method for correct determination of free surface-energy parameters for different substances.

Application of the acid-base approach to explain adhesive properties of modified rubber coatings

The influence of the content and composition of polymeric petroleum resins (PPRs) on the properties of incongealable sealants based on butyl rubber was studied. It was shown that the introduction of PPR B grade increases the adhesion ability of these sealants to duralumin. It was concluded that use of the acid-base approach is a good tool for explaining the nature of adhesive relationships.

Adhesion of polymers: New approaches to determination of surface properties of metals

Determination of the acid-base properties of metal surfaces used as substrates in adhesive compounds was performed by a two-liquid method. It was shown that the suggested method provides a possibility of scientifically grounded selection of a substrate for creating adhesive polymeric-adhesive-metal compounds with a high level of interphase acid-base interaction.

Interaction of Adhesives in Metal-Polymer Systems in Acid-Base Approach

A comparative analysis of different methods of evaluating the surface energy and acid-base characteristics of solid smooth polymer surfaces is carried out. It is founded that the surfaces of many studied polymers have low energy and are characterized by low values of acidity parameters; furthermore, their acidbase properties are significantly affected by the preparation of the surface (time and temperature of extrusion, etc.). It is shown that the acid-base approach makes it possible to find the optimum concentration for the makeups of composite materials with specified properties.

Surface treatment with ultraviolet laser for adhesive bonding of polymeric materials

ABSTRACT We demonstrated an efficient surface pretreatment with excimer laser at 193 nm, which could be successfully used as a surface preparation tool to improve the adhesion and mechanical properties of bonded polymer joints. The effect of the ultraviolet (UV) light can be used both as a method for increasing the specific surface area improving the mechanical adhesion and as a method for activating the polymer surface improving the physical adhesion. Mechanical tests and studies on the failure of bonded polycarbonate (PC) and polyetheretherketone (PEEK) samples showed a significant increase in the quality of bonded connections by using pretreatment with UV laser. As a result of the studies, the bond strength of the PC samples was increased by about 32% using a PB437 UV curing adhesive. By using Loctite 9466 applied to PEEK samples, a strength increase of about 36% was achieved.

The Nature of Interactions on Copolymer of Ethylene with a Vynilacetate-Metal Interface

Surface energetic and acid-base properties of coatings based on copolymers of ethylene with vinylacetate are studied. It is shown, that acid-base interactions have determining role in adhesion interaction on the interface with metal.

The role of acid-base interactions in the formation of polymer-metal adhesive joints

A new method for determining the surface acidity of polymeric and metal materials is described. The modified Berger method is used as a prototype. The influence of thermal treatment on the acidity parameters of a metal surface is established. The importance of exact determination of the acidity parameters for different solid surfaces is demonstrated, and the possibility of its effect on the value of the strength of adhesive joints is studied. It is shown that, when conditions of the production process are varied, it is possible to increase the adhesive strength. Low-and high-density polyethylenes are used as coatings; brass and titanium, as substrates. The results will be useful for the development of coatings of various types, including those with polyolefins.

Acid-base interactions and adhesion capacity in the system constituted by an epoxy coating and a metal

Free surface energy and acidity parameter of solid surfaces of polyepoxides used as anticorrosive coatings were measured. Formulations of epoxy resins with various curing agents were studied. The adhesion capacity of epoxy films to various metallic surfaces was evaluated.