SYNTHESIS AND CHARACTERIZATION OF POLY(1-SILA-CIS-PENT-3-ENES) SUBSTITUTED WITH PENDANT PYRIDINYL GROUPS

[3'-(3''-pyridinyl)propyl]-1-sila-cis-pent-3-ene], [3'-(3''-pyridinyl) propyl)-1-sila-cis-pent-3-ene], and y[1-phenyl-1-(4'-pyridinyl)-1-sila -cis-pent-3-ene] were synthesized by the anionic ring-opening polymeri zation of l-1-[3'-(3''-pyridinyl)propyl]-1-silacyclop-3-ene, -[3'-(3'' -pyridinyl)propyl]-1-silacyclopent-3-ene, and 1-phenyl-1-(4'-pyridinyl )-1-silacyclopent-3-ene, respectively. These are the first polycarbosi lanes which contain heterocyclic pyridine units as side-chain substitu ents. These polymers were characterized by H-1, C-13, and Si-29 NMR as well as by IR and UV spectroscopy. The molecular weight distributions were determined by gel permeation chromatography; glass transition te mperatures, by differential scanning calorimetry; (DSC) and thermal be havior, by thermogravimetric analysis. (TGA).