Acrylic monomers and polymers with perfluoroalkylated biphenyl side groups: synthesis and phase transitions

Synthesis and characterization of new cationic quaternary ammonium polymerizable surfactants

“…Condis crystals are conformationally disordered crystals [36] in which the hydrophobic tail is usually in a disordered state, close to the liquid state [37]. Thermotropic liquid crystalline mesophases are induced by a change in temperature and occur because of anisotropic dispersion forces between the molecules and because of packing interactions [33].…”

“…The latter is used to explain the aggregation behavior of surfactants. In general, it is the surfactant's hydrophobic tail length [23], size of head group [31,32], and type of counterion [33,34] that influence the packing parameter. Other constraints, such as temperature [35] and surfactant concentration [21], also play a role, leading to differences in the LLC phases for a given surfactant/water system.…”

Characterization of acrylic copolymer latex modified by fluorine, silicon, and epoxy resin

“…The fluoropolymers have exhibited outstanding performances including high mechanical and thermal stability, chemical inertness (to solvents, chemicals, acids and bases), low friction coefficients, low flammability, excellent weather ability, good resistance to oxidation, extremely low surface energy, and relatively low permeability for most gases [1][2][3][4]. The structure of alternating carbon / hydrogen bonds with carbon / fluorine bonds, in combination with the high bond strength of carbon-fluorine atoms (486 kJ/mol) in fluorinated polymers, provides chemical inertness that enables the formulation of fluorinated polymers to resist environmental degradation (i.e., to solvents, chemicals, acid and base, oxidation, airborne pollutants) and the ultra low surface energy reduces dirt retention [5][6][7].…”

Mesophase structure of low‐wetting liquid crystalline polyacrylates with new perfluoroalkyl benzoate side groups

“…INTRODUCTION Fluorinated liquid crystalline polymers are a relatively new class of fluoropolymers; see illustrations of different structural classes of polymers. [1][2][3][4][5][6][7][8][9] Initial studies on fluorinated liquid crystals focused on partly fluorinated alkanes, namely diblock hydrocarbon-fluorocarbon molecules such as H(CH 2 ) x (CF 2 ) y F (x, y > $6). [10][11][12][13][14] The ability of these compounds was shown to form thermotropic mesophases because of the strong intramolecular phase segregation 15 and the rigid, rod-like nature of the fluorocarbon chains.…”

“…More conventional mesogenic units, for example, biphenyls and bisbenzoates, have also been used in combination with partly fluorinated tails in low molar mass [29][30][31][32][33] and polymeric liquid crystals. 6,25 Such fluorinated polymers have lately been considered as candidate materials for the macromolecular engineering of lowsurface energy films through self-organization. In fact, spontaneous assembling over different length scales may be driven by several mechanisms, including liquid crystallinity and surface segregation.…”