β Scribed by T. Petrova
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The molecular structure of polyethylene obtained by the system TiCI4-Et2AIC1-Ph2Mg was investigated. The polymer has a linear structure with a minimum amount of branching. The unsaturation is caused by the presence of one terminal vinyl group: this is due to the character of termination reactions. The polymer has a narrow molecular weight distribution; the content of low molecular weight products is lower than in polyethylene obtained with the TiCI4-Et2AIC1 system and a high molecular weight tail is absent. The system containing a small amount of PhzMg (a "modified" system) is more similar in activity, just as in the structure of the resulting polymer, to the TiCI4-Et2A1C1 system. These phenomena might be related to different valent states of titanium at different Ph2Mg/TiC14 molar ratios and to possible absence or presence of active centres of different valence.
π SIMILAR VOLUMES
By means of GLC-analysis on columns with different polarity phases the composition of the sulphur-containing volatiles obtained by the thermal treatment of the industrial broths and alkyl-mercaptopropanol was studied using flame-photometric detector specific for sulphur. The identification of the su
## Abstract Summary: The polymerization of propene in the presence of CpTi(CH~3~)~3~/B(C~6~F~5~)~3~, at low temperature, affords prevailingly syndiotactic elastomeric polypropylene. In the presence of methylalumoxane (MAO) and under the same polymerization conditions, both CpTi(CH~3~)~3~ and CpTiCl