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ABSTRACT:The adhesion promotion mechanism of organofunctional silanes has historically been attributed to the formation of an ''interpenetrating polymer network'' between a polymerized silane film and the polymer. This notion was investigated by formulating and testing two hypotheses. First, if the adhesion promotion is due to the formation of an interpenetrating polymer network, variation in the time-temperature profile of the bonding conditions should alter the extent of interdiffusion and thus interfacial strength. Second, if the adhesion promotion is due to compatibility and penetration of the silane organofunctional group, not the bulk silane film, variation in the structure of that group should change interfacial strength. Direct interfacial strength measurements using single-particle composites show that variation in the time-temperature profile of bond formation does not significantly affect interfacial strength. However, use of a series of aminofunctional silanes (with constant C : N ratio and identical surface energetics) revealed a relationship between length of the aminofunctional group and interfacial strength. These results suggest that the adhesion promotion for the system studied is controlled by compatibility and penetration of the silane organofunctional group. Whereas all of the interfaces studied here featured poly(vinyl butyral), the conclusions should apply to all amorphous polymeric materials.

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She currently has research activity in biological production and use of ligninolytic enzymes in biomass deconstruction for bioproducts and biofuels manufacture. She also has interests in developing tools to promote the use of higher cognitive skills in engineering coursework. Dr. Kelly recently earned OSU's Austin-Paul Engineering FacultyAward for mentoring students. Edith Gummer, Northwest Regional Education Laboratory Edith Gummer is the Director of the Classroom-Focused Research and Evaluation Program for the Center for Classroom Teaching and Learning at the Northwest Regional Educational Laboratory. She coordinated the structure of the research design and the data collection and analysis processes of the project. She has been faculty in science and mathematics education quantitative and qualitative research design courses at the doctoral level. She has been involved in the development of innovative mathematics curricular activities and formative assessment in mathematics problem solving.