OLIGOACRYLATES WITH 4-CYANOBIPHENYL MESOG ENIC GROUPS

Three oligoacrylates with cyanobiphenyl mesogenic groups were synthesi zed and fractionated into narrow fractions. The three oligoacrylates d iffered in the length of spacers (four, five, or six methylene units) in the main chain between the mesogenic groups. Analysis of the proper ties of the mesophases of the obtained products and examination of the plots of phase transition temperatures versus the degree of polymeriz ation, led us to distinguish several molecular mass regions, each of w hich was associated with a specific product. These regions involve the region in which individual liquid crystals (LC monomers) exist and th ose corresponding to suboligomers with the degree of polymerization P < 10, oligomers with 10 < P < 100, and LC polymers with P > 100. A mol ecular model that explains the specified boundaries was suggested.