January 1987
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14 Reads
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29 Citations
Advances in Polymer Science
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January 1987
·
14 Reads
·
29 Citations
Advances in Polymer Science
... At the same hydrogen concentration, the isotactic index of polypropylene tends to increase with the increase of polymerization temperature. Since the more isoselective-active sites produce higher molecular weights polypropylenes [23], the MFR of produced polypropylene would decrease, and polymerization activity would increase with increasing II. The polymerization activity of the group with nonisothermal prepolymerization increased with increasing II, but the MFR increased after the temperature was raised from 70°C to 80°C. ...
January 1987
Advances in Polymer Science