Microstructure of Products of Isoprene Polymerization on Titanium-Magnesium Catalysts: an NMR Study

摘要

Polyisoprenes synthesized on titanium-magnesium catalysts were studied by H-1 and C-13 NMR spectroscopy (Larmor's frequency for protons 700 MHz). The problems concerning the accuracy of determining the microstructure of polyisoprenes with high content of trans units are discussed. As demonstrated for a series of samples with varied configurational and isomeric composition, the cis and trans units are distributed in the macromolecules in the block (continuous) fashion, whereas the 3,4-units are distributed randomly.