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42. 43. 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.
It is permissible to interpret MMD curves for polydienes obtained as a confirmation of the presence of, at least, two types of active sites of polymerization. 5, respectively. For the inverse sequence of the component injection MMD curves are monomodal and the lowmolecular peak disappears. Hence, it appears back again in MMD curves, ifthe optimal Cl:Nd ratio is significantly (4 times) exceeded [70]. As a consequence, catalytic system formation conditions promoting fuller halogenation of neodymium, the formation of insoluble NdCb particles, causes occurrence of, at least, two types of polymerization sites in the three-component lanthanide catalytic systems.
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