Active sites of polymerization: multiplicity: stereospecific - download pdf or read online

By B Monakov; Z M Sabirov; N N Sigaeva

ISBN-10: 9067644242

ISBN-13: 9789067644242

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Ca t a1ys1ts I (AIIP r= 50) Ill . h ep't ane a t 25°C praseodtymmm-con t ammg Unit content,% Catalytic system [IJ],dl/g 1,4cis70 I. 1 86 90 C3HsPrb·2THF-Al(i-C4H9)3 [7] It has been found [51] that isobutylene release, as the degradation product of organoneodymium compounds formed by NdCb·L interaction with Al(i-C 4H9)3 in toluene at 20°C, depends on the ligand origin and equals about 40 and 70% (relative to Nd) for compl,~xes containing sulfoxide and ethanol, respectively. Stabilizing effect of sulfoxides may testify about their presence in the coordination sphere of neodymium..

N. N. Urazbaev sites after catalyst contact with ethylene during 60 minutes was determined using 14CO probes injected to polyethylene. It is obvious that the catalytk system shows the highest activity (polymerization rate, active site concentration and polymer yield) at lower content of applied titanium and greater specific surface of the catalyst. The number of active sites decreases simultaneously with the catalyst surface. This is the reason for noticeable reduction of its activity. Therefore, as indicated [ 17], then: is a relation between titanium content, catalyst surface, its activity and active site concentration.

384. Active sites ofpo{vmerization. Multiplicity 37. 38. 39. 40. 41. 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.

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Active sites of polymerization: multiplicity: stereospecific and kinetic heterogeneity by B Monakov; Z M Sabirov; N N Sigaeva

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