Synthesis of side-chain liquid crystal polymers by living ring-opening metathesis polymerization. 2. Influence of molecular weight, polydispersity, and flexible spacer length (n = 9-12) on the thermotropic behavior of the resulting polymers

Synthesis and characterization of 4-cyanobiphenyl-4?-yloxy-functionalized poly(7-oxanorbornene-5,6-exo-dicarboximide)s via ring opening metathesis polymerization (ROMP)

“…(2) CBA 4 displays only a monotropic nematic phase. for CBA 4 and in the second and subsequent heating scans for CBA 5 and CBA 7 , an additional peak appears below the melting peak. It is followed by a clear exotherm in the DSC scans of CBA 5 and CBA 7 , thus indicating a melting-recrystallization-melting process.…”

“…Polymerizability tests concerning CBON 3 were performed with the same procedure, varying the heating treatment and concentration as indicated in Table IV 5 ). The resonances corresponding to the methylene groups vary with n and with their position along the spacer (Table I).…”

“…The analysis of the data showed that the carbon chemical shifts of methylene in the ␤, ␥, and ␦ positions with respect to the N-carboximide group (C 2 , C 3 , and C 4 respectively) are affected by the -aryloxy group for n Ͻ 4, n Ͻ 5, and n Ͻ 6 respectively. Similarly, the carbon chemical shifts of methylene in the ␤, ␥, and ␦ positions with respect to aryloxy group (C 7 , C 6 , and C 5 for CBON 8 , C 6 , C 5 , and C 4 for CBON 7 , C 5 , C 4 , and C 3 for CBON 6 and C 4 , C 3 , and C 2 for CBON 5 ) are affected by the N-carboximide group for n Ͻ 4, n Ͻ 5, and n Ͻ 6 respectively.…”

Synthesis of novel acetylene monomers with mesogenic moieties and their polymerization using Schrock-type molybdenum carbenes

“…Therefore, the molecular weight distributions are not as narrow as, for example, for ring-opening metathesis polymerization of liquid crystalline nor-bomenes [60][61][62]. Nevertheless, the polymerization results are uniform and well reproducible.…”

Enantioseparation of doubly functionalized polar norbornenes by HPLC and their ruthenium‐catalyzed ring‐opening metathesis polymerization

“…Thus, if optically resolved monomer is obtained, it would be of great interest to evaluate polymerization behavior for the enantiomerically pure norbornene derivatives bearing both cyano and ester groups. Although Schrock and coworkers reported the synthesis of substituted polynorbornenes, [33][34][35][36][37][38][39][40] to the best of our knowledge, the influence of the main chain microstructure on the optical behavior of exo-2,3-disubstituted polynorbornenes has not been investigated very intensively to date.…”