METATHESIS COPOLYMERIZATION OF CHLORINE-CONTAINING ACETYLENES WITH NBE CATALYZED BY MOCL5-N-BU4SN

In the copolymerizations of 1-chloro-1-octyne (ClOc) and 1-chloro-2-ph enylacetylene (ClPA) with norbornene (NBE) by MoCl5-n-Bu4Sn in toluene at -20-degrees-C, both comonomers were consumed simultaneously. The G PC curves of the copolymerization products were unimodal and identical irrespective of the RI and UV (290 nm) detectors. The C-13 NMR spectr a of the products exhibited the presence of cross-propagating sequence s. From these results, it is concluded that the copolymerization produ cts are copolymers and not mixtures of homopolymers. The monomer react ivity ratios were: r(ClOc) = 0.69, r(NBE) = 6.4; r(ClPA) = 1.0, r(NBE) = 3.1. The more electron-donating the ring substituent of ClPA, the m ore reactive the ClPA in copolymerization with NBE.