H - Electricity – 01 – B
Patent
H - Electricity
01
B
H01B 1/20 (2006.01) H01B 1/22 (2006.01) H01B 1/24 (2006.01) H01H 37/32 (2006.01) H05K 3/32 (2006.01)
Patent
CA 2228941
The invention provides a composite article (24) whose electrical and/or thermal conductivity undergoes a significant change in response to variations in one of several externally controlled thermodynamic parameters, such as temperature, pH, ionic strength, and solvent composition. The composite article (24) is formed by at least three components: conductive filler particles (22), cross-linked polymeric particles (10/12) that are swellable and deswellable, and a solvent mix (20). In the deswollen state, the gel particles (10) occupy a relatively small volume fraction of the composite article (24), allowing the conductive filler particles (22) to be discrete, fully suspended and free flowing in the solvent mix (20). Upon switching to the swollen state, the interstitial volume of the composite article (24) between the cross-linked gel particles (12) diminishes, forcing the conductive filler particles (22) to come into intimate contact with one another, thus creating a conductive percolation network (26). As a result of contact between the conductive filler particles (22), the electrical and/or thermal conductivity of the composite article (24) is increased.
L'invention concerne un article composite (24) dont la conductivité électrique et/ou thermique change de manière significative en réponse à des variations d'un des paramètres thermodynamiques modulés par l'extérieur, tels que la température, le pH, la force ionique et la teneur en solvant. L'article composite (24) est constitué d'au moins trois composants: des particules de remplissage conductrices (22), des particules polymères réticulées (10/12) pouvant subir un gonflement ou un dégonflement, et un mélange solvant (20). A l'état dégonflé, les particules en gel (10) occupent une fraction de volume relativement faible de l'article composite (24), ce qui permet aux particules de remplissage (22) d'être séparées, intégralement en suspension et de s'écouler librement dans le mélange solvant (20). A l'état gonflé, le volume interstitiel de l'article composite (24) entre les particules en gel (12) réticulées diminue, ce qui force les particules de remplissage conductrices (22) à venir en contact étroit les unes avec les autres et crée un réseau de percolation (26) conducteur. Ce contact entre les particules de remplissage conductrices (22) permet d'augmenter la conductivité électrique et/ou thermique de l'article composite.
Soane Zoya Martynenko
Smart & Biggar
The Dow Chemical Company
Zms Llc
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