Thermal Properties of Epoxy-Based Adhesive Reinforced With Nano And MicroParticles For In-Situ Timber Bonding
—CB10TSS thixotropic and room temperature cured epoxy based adhesive specially formulated for in-situ bonding of pultruded rod into timber for repair and strengthening of timber structures. The glass transition temperature for CB10TSS is 31.7ºC which considered low for outdoor exposure. Therefore CB10TSS was modified by reinforcing it with nano-and micro-particles and denoted as Nanopox (CB10TSS/nanosilica), Albipox (CB10TSS/liquid rubber) and Timberset (CB10TSS/ceramics). Thermal properties of epoxy adhesives were studied by using dynamic mechanical thermal analysis (DMTA) and differential scanning calorimetry (DSC). Albipox showed significant improvement in the glass transition temperature but Timberset has the highest Tg, due to high modulus of ceramic particles. A second scan for all the adhesives increased Tg which shows that the room temperature cured adhesives are not fully cross-linked. In DSC scan, typical graphs of heat flow versus temperature able to describe more characteristic of the curing behavior such as a sharp and deep endothermic dip at Tg which corresponds to a rearrangement of the molecules and the wide and shallow endothermic dip at around 100°C is associated with moisture in the adhesive.
AN INVESTIGATION OF THE EFFECT OF NANO ALUMINA ON THE ELECTRICAL AND THERMAL PROPERTIES AND MORPHOLOGICAL BEHAVIOR OF THE CAST EPOXY NANO COMPOSITE
This paper investigates the effect of nano alumina, which is a stiff material with high thermal conductivity, on properties of cast epoxy composite filled with silica flour by performing experiments to measure breakdown strength, thermal stability and morphological behaviour. To accomplish this, different weight percent of nano alumina was added to the epoxy/silica system and electrical test was carried out on different temperatures. It was observed that in glassy region presence of nano alumina increased dielectric strength due to high surface area while at temperature range above glass transition temperature, interaction between filler and matrix dominated dielectric strength of composites. Study on thermal properties of cast epoxy systems showed that nano alumina increased thermal stability of composites. Also, it was found that the 5 wt% specimen had the highest Tg among nano composite samples. Study of morphology indicated that alumina particles located at silica flour and epoxy matrix interface.
The politics of becoming bodies: Sex, gender and intersubjectivity in motion
Abstract This paper presents readers with one (research) story about (sexed and gendered) bodies not as objects with inherent boundaries and properties but as material-discursive phenomena. In telling such a story I examine the role that the screendance, Becoming Bodies , has played in knowledge production and argue for a less ontologically ‘old fashioned’ view of what counts as ‘evidence’. Throughout the paper I draw from a range of feminisms: biological, phenomenological, poststructural, psychoanalytical, and post humanist and performative scholarship of sex and gender. These discourses contest nature/nurture, male/female, body/mind dualisms, and take the political and ethical view that bodies are not neutral; that sex and gender, being a woman or a man are both socially and biologically constructed forms of identity (similar to class and race) that are acquired and learned through socio-cultural regimes of discipline and intersubjective bodily practices. Building on this dynamic and developmental bio-psycho-social view I discuss selected aspects of interview data: (1) the material-discursive tensions and contradictions of sexing and gendering bodies and (2) troubling the intersubjective implications of this for clinical practices.