Dali Youcef, BoumédièneBouchaour, TewfikMaschke, Ulrich2013-03-132013-03-132011-05https://dspace.univ-tlemcen.dz/handle/112/1566This paper reports on the phase behavlor of photochemically crosslinked poly(n-butyl acrylate) (PABu) and oly(2•ethylhexyl acrylate) (PEHA) networks ln a nematlc llquld crystal (Le) solvent. The swelling propertles of these networks were studied as a functlon of temperature using a low molecular weight LC (LMWLC). Whlch is an eutectic mixture of cyanoparaphenylenes named E7. To obtain different polymer network densities, the ratio of the reactive monomers ABu {or EHA) to the crosslinklng agent hexanedloldiacrylate {HDDA) was varled prlor to polymerizatlon/ crosslinking reactions. Immersion of these networks ln an excess of LC solvent allowed for the measurement of size increase by polarizing optical microscopy in terms of temperature. Diameter ratios were calculated considerlng swollen to dry network states of the samples. The uptake of LMWLC lnslde the network preferentially takes place around the nematic to Isotropie transition temperature of the solvent. Phase diagrams in the concentration-temperature framework were given and discussed as a function of crossllnking degree of the polymer network and tempera• ture and phase behavior of the solvent.enOther