Summary
CrCl2·(dmpe)2-MAO gives crystalline 1,2 syndiotactic polymers from butadiene and 3,4 atactic polymers from isoprene. Butadiene-isoprene copolymerization gives copolymers in which butadiene and isoprene units have respectively a 1,2 and a 3,4 structure. Copolymers with less than 20% isoprene are crystalline, their melting point decreasing from ca. 160°C to ca. 50°C with increasing isoprene content. This makes possible to obtain 1,2 syndiotactic polybutadiene with controlled melting point. Copolymers with more than 20% isoprene are amorphous, with a glass transition temperature in the range 2÷5°C. Copolymer microstructure was determined by 13C NMR.
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Received: 10 February 2001/Revised version: 12 February 2002/ Accepted: 12 February 2002
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Ricci, G., Battistella, M., Bertini, F. et al. 1,2 Syndiotactic polybutadiene of controlled crystallinity by butadiene-isoprene copolymerization with CrCl2·(dmpe)2-MAO. Polymer Bulletin 48, 25–31 (2002). https://doi.org/10.1007/s00289-002-0010-6
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DOI: https://doi.org/10.1007/s00289-002-0010-6