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Effects of polymerization conditions when making norbornene‐ethylene copolymers using the metallocene catalyst ethylene bis (indenyl) zirconium dichloride and MAO to obtain high glass transition temperatures
Author(s) -
Bergström Christer H.,
Seppälä Jukka V.
Publication year - 1997
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19970222)63:8<1063::aid-app13>3.0.co;2-7
Subject(s) - norbornene , metallocene , polymer chemistry , glass transition , ethylene , polymerization , materials science , copolymer , monomer , catalysis , zirconium , toluene , post metallocene catalyst , molar mass distribution , polymer , chemistry , organic chemistry , composite material , metallurgy
Using 70 mol % norbornene in the monomer mixture before polymerization, the influences of different polymerization conditions were studied. It was found that by increasing the temperature from 10 to 70°C, the yield increased and the molecular weight decreased; and when increasing the ethylene pressure from 2 to 6 atm, yield and molecular weight increased. The highest glass transition temperatures, however, were achieved at 30°C and 4 atm. Further improvements could be obtained by increasing the amount of catalyst or Al/Zr ratio. Using the conditions of 30°C, 4 atm, 4 mg catalyst, 3000 Al/Zr, 250 mL toluene solution, and 30 min, the amount of norbornene was increased from 31.1 to 90 g, resulting in an increase in the glass transition temperature from 98 to 155°C. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 1063–1070, 1997