Decisive properties of solvent able to form gels with syndiotactic polystyrene

Electrically Conductive Gels Prepared from Syndiotactic Polystyrene and an Ionic Liquid

“…We have already examined the structure and properties of SPS/pyridine (Py) gels. 16 Taking into account good compatibility between SPS and Py, we tried to produce SPS gels containing ILs having a pyridinium ring. The thermogravimetry (TG) plots showed that the temperatures where the thermal decomposition process of 1-butyl-4-methylpyridinium tetrafluoroborate and 1-butylpyridinium bis(trifluoromethanesulfonyl)imide occurred happened to overlap with the temperatures where Before finding the better preparation conditions of SPS gels containing ILBr, we tried the following experiments step-bystep.…”

“…We have already examined the structure and properties of SPS/pyridine (Py) gels . Taking into account good compatibility between SPS and Py, we tried to produce SPS gels containing ILs having a pyridinium ring.…”

“…12,13 Previously, we examined where more than 60 solvent compounds could form SPS gels. 14−16 Finally, it was concluded that the formation of SPS thermoreversible gels was strongly dependent on the molecular volume of the solvent and compatibility between SPS and the solvent and that there is a “gelation range” of solvent molecules as for molecular volume size and solubility parameter.…”

“…SPS is known to have complex polymorphic behavior − and forms physical gels when dissolved in some organic compounds . Thermoreversible gels of SPS have been extensively studied so far since Kobayashi et al Finally, SPS gels are established to have a three-dimensional network of fibrils consisting of the δ crystalline phases such as a δ clathrate phase , or a δ intercalate phase. − If all of the solvent molecules are evacuated from SPS gels, the X-ray diffraction peaks of the SPS samples are identical to those of SPS δ empty crystalline phase, which is monoclinic (space group P 2 1 / a ; a = 1.74 nm; b = 1.18 nm; c = 0.78 nm; γ = 117°) and exhibits per unit cell 2 identical cavities centered on the center of symmetry and bounded by 10 phenyl rings. , Previously, we examined where more than 60 solvent compounds could form SPS gels. − Finally, it was concluded that the formation of SPS thermoreversible gels was strongly dependent on the molecular volume of the solvent and compatibility between SPS and the solvent and that there is a “gelation range” of solvent molecules as for molecular volume size and solubility parameter.…”

Absorption and Isomerization of Azobenzene Guest Molecules in Polymeric Nanoporous Crystalline Phases

“…It is well to highlight that polymeric nanoporous crystalline (NC) phases present many advantages with respect to nanoporous amorphous polymers as well as with respect to inorganic and organometallic nanoporous materials. Particularly relevant are simple processing conditions (low pressures and temperatures) and processing techniques (both from melt and solutions) [18], leading to a large variety of morphologies like fibers, sheets, films, membranes, foams, gels and aerogels [19][20][21][22][23]. Moreover, NC polymers present the further advantage of showing identical cavities that allow molecular selectivity [24][25][26][27][28][29][30] comparable to those of NC inorganic and organometallic materials.…”