Liquid‐crystalline side chain block copolymers — synthesis, morphology and LC behaviour

Liquid crystalline side-group block copolymers with triblock structure: Investigations on the influence of the block arrangement on the morphology and the LC-phase behavior

“…The reaction mixture was stirred for 4 days and precipitated in methanol, washed, and dried. A final purification was carried out by using a preparative HPLC (column PSS, SDV linear, 10 pm, RI-detector) to separate the excess of the mesogenic substance. The molecular weights of the homo-and bldck copolymers were analysed using a Knauer HPLC (column PSS, SDV linear, 5 pm, RI/Viscodetector) by using an universal calibration curve.…”

Influence of chemical structure on the optical properties of new side-chain polymers containing cholesterol

“…[11][12][13][23][24][25] Side-chain homopolymers with a cholesteryl group in flexible spacers such as poly(cholesteryl-ω-acryloyloxyalkanoates) (PChA-n), [11][12][13] poly(cholesteryl-ω-methacryloylalkanoates) (PChM-n) [11][12][13] and poly[4-cholesteryl-4′-(acryloyloxy-n-alkyloxy) benzoates] [14] form cholesteric phases in a narrow range and smectic phases in a wide range. In contrast, other homopolymers [11][12][13]15,16,[18][19][20][23][24][25] properties of the side-chain LC polymers with different chemical linkages to the cholesterol are investigated. We have also identified how the arrangements of different types of chemical linkages affect the optical properties in a cholesteric phase by comparing the results of this experiment with those related to PChA-n ( Figure 1).…”

“…Numerous researchers have investigated the possibility of sidechain cholesteric polymers with cholesterol in different alkylene spacers. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] In particular, during the past few decades, many researchers have investigated the thermotropic cholesteric phase of flexible side-chain polymers with cholesterol, including polyacrylate, [11][12][13][14][15][16][17][18][19][20][21][22] polymethacrylate [11][12][13][16][17][18][19][20][21][22] and polysiloxane. [11][12][13][23][24][25] Side-chain homopolymers with a cholesteryl group in flexible spacers such as poly(cholesteryl-ω-acryloyloxyalkanoates) (PChA-n), [11][12][13] poly(cholesteryl-ω-methacryloylalkanoates) (PChM-n) …”

Synthesis of block and graft copolymers containing liquid-crystalline segments

“…Several relevant and recent methodologies of synthesis have been worked up: (i) polymer-analogous reaction of AB type prepolymers, 1,2 (ii) ionic living block copolymerization between conventional and LC monomers and organometallic catalysed living insertion polymerization, 3,4 and (iii) the use of macromonomer and macroinitiator systems. 5,6 Our synthetic goal to the synthesis of block and graft copolymers is based on the following: …”