Abstract
The initial polymerization stage of 1,5-hexadiene catalyzed by a MgCl2-supported Ziegler catalyst was investigated by means of the stopped-flow method. The polymerization proceeded in toluene at 30°C within the extremely short period (<0.2 s) to give a solid polymer in which 92% of monomer units cyclized and 42% of the cyclopentane rings were trans. It was observed that the polymer yield and molecular weight were proportional to the polymerization time up to 0.2 s, while the molecular weight distribution and the microstructure of the polymer obtained were constant under the condition. It revealed that the polymerization of 1,5-hexadiene with a MgCl2-supported Ziegler catalyst could be performed under quasi-living stage by virtue of the stopped-flow method.
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