Multiphase Polymers - Blends and Ionomers by L. A. Utracki, R. A. Weiss

By L. A. Utracki, R. A. Weiss

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When the catalyst is formed at 60°C in the presence of piperylene additives, polymerization at ooc gives no optically active polypiperylene. :ts Al(i-C 4H 9)3 is replaced by stronger electron acceptor Al(i-C4H9)2H, optk~ally active polypiperylene is not synthesized at all. ence of asymmetrical action of active sites of polymerization may be associat~:d with the presence or the absence of ligand L * in their structure. N. 6). 37 Active sites ofpolymerization. 5. An(/3) - lnM, derived from them, are polymodaL As these curves are divided into separate Gaussian functions [22, 23], for the majority of monomer conversions four maxima are obtained for TBP used as the catalytic ligand and five maxima- for DASO.

44. 45. 46. 47. 48. 49. 50. 51. 52. 53. 54. 55. 17 Chen F. , 'Mechanical and kinetic polymeric reactions. Their use in polymer synthesis', Int. Symp. Honor Prof Pierre Sigwalt Occas, his 651h Birthday, Prepr. Sympo/'90, 1990, Paris, p. 103. Kiyoshi E. , Macromol. Chern. , 1990, vol. 11(12), p. 663. BywaterS. , 'Advanced Elastomers and Rubber Elasticity', Proc. Symp. Nat. Amer. Chern. , 1985, Chicago, p. , Polym. , 1995, vol. 38(4), p. 325. , Int. Symp. Ion. , 1995, Istambul, p. 58. , J. Macromol.

The influence of ligand environment of transition metal The influence of ligand environment origin of transition metal in the ionic-coordinate catalytic systems on thf:ir stereospecificity was studied on the example of chromium compounds. It is shown that for polybutadiene and Active sites ofpolymerization. Multiplicity 31 polyisoprene all possible microstructures can be realized with respect to the origin of ligands surrounding atom of chromium [41]. Contrary to chromium-containing catalytic systems, for primary lanthanide catalysts LnCb-AIR3 polybutadiene synthesis with high content (up to 98%) of 1,4-cis-units was observed.

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