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Copolymerization of ethylene with bicyclo[2.2.1]hept‐5‐ene‐2‐methanol: A facile route to hydroxyl functional poly(ethylene)s
Author(s) -
Radhakrishnan K.,
Sivaram S.
Publication year - 1998
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(19981101)19:11<581::aid-marc581>3.0.co;2-8
Subject(s) - copolymer , ethylene , polyethylene , polymer chemistry , methanol , ene reaction , differential scanning calorimetry , metallocene , bicyclic molecule , materials science , catalysis , chemistry , organic chemistry , polymer , polymerization , physics , thermodynamics
A direct and efficient route to the synthesis of hydroxyl functional polyethylene was identified by copolymerization of ethylene with bicyclo[2.2.1]hept‐5‐ene‐2‐methanol prereacted with trimethylaluminium using the catalyst system metallocene/MAO. Copolymerization studies were conducted using three metallocenes, namely, Cp 2 ZrCl 2 , Et(ind) 2 ZrCl 2 and Me 2 SiCp 2 ZrCl 2 the last one of which gave a copolymer containing as much as 6.2 mol‐% of alcohol. The effect of the Al/Zr ratio as well as of temperature was studied. The copolymers were characterized by means of 1 H NMR, differential scanning calorimetry, and intrinsic viscosity measurements.