Abstract
The polymerization of 1-octene initiated by methylalumoxane (MAO)-activated Ni(II)-based-α-diimine complexes [(2,6-i-Pr)2C6H3-DAB(An)]NiBr2 was investigated. Using this catalyst, poly(1-octene)s with molecular weight between 100 × 103 and 400 × 103 and polydispersity (M w/M n) between 1.3 and 1.5 were synthesized successfully by varying reaction time at room temperature. The poly(1-octene)s were amorphous polymers and could be well soluble in tetrahydrofuran (THF). After fractional precipitation, poly(1-octene)s with narrow molecular weight distributions (M w/M n ≤ 1.12) were obtained. Their weight-average molecular weights were measured by gel permeation chromatography (GPC) in conjunction with online model BI-MwA multiangle laser light scattering (MALLS), and their intrinsic viscosities were measured by Maron’s single-point method. The k and α values in Mark-Houwink equation [η] = KM α in THF at 40°C were 0.089 mL/g and 0.61 respectively.
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