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a) b - École Polytechnique de Montréal

a) b - École Polytechnique de Montréal

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conductive polymer, the applicability of these original morphologies is confirmed mostly by<br />

conductivity results. It is shown that the or<strong>de</strong>r of phases in a complete wetting case such as a<br />

multi-percolated structure is <strong>de</strong>pen<strong>de</strong>nt only on the thermodynamic properties; although viscosity<br />

and composition of phases play a major role in the <strong>de</strong>termination of the morphology, they do not<br />

change the or<strong>de</strong>r of phases. In this case, addition of the copolymer of adjacent phases in a multipercolated<br />

structure induces a reduction in the phase size of the other phases, lowering the<br />

percolation threshold of phases, which leads to higher conductivity of the samples. Though the<br />

or<strong>de</strong>r of phases in multi-percolated structures is <strong>de</strong>termined by the interfacial tension between<br />

phases, it is shown that the viscosity of phases significantly influences the distribution of<br />

interfacial energy between phases, and ultimately, the morphology.<br />

It is shown that fully interconnected porous materials are prepared via the production of a multipercolated<br />

structure followed by selective phase extraction. These porogens are used as<br />

substrates for alternate <strong>de</strong>position of PSS and PANI. A <strong>de</strong>tailed study on the behaviour of<br />

polyelectrolytes in the <strong>de</strong>position process is carried out.<br />

This thesis presents a systematic technique for study and prediction the morphology of<br />

quaternary and quinary blends. To date, there is no theory for prediction of the morphology and<br />

or<strong>de</strong>r of the phases in hierarchical self-assembled systems prepared by melt-blending. This is the<br />

first study which begins to <strong>de</strong>velop some mechanism and methods to predict the morphology of<br />

multi-component blends.<br />

210

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