Polymerization of styrene to isotactic polymer with MAO‐Ni(acac) 2 . Examination of the factors that influence activity and stereospecificity | Zendy

Crossetti Geraldo Lopes | Zendy; Bormioli Carlotta | Zendy; Ripa Alberto | Zendy; Giarrusso Antonino | Zendy; Porri Lido | Zendy

Premium

Polymerization of styrene to isotactic polymer with MAO‐Ni(acac) 2 . Examination of the factors that influence activity and stereospecificity

Author(s) -

Crossetti Geraldo Lopes,

Bormioli Carlotta,

Ripa Alberto,

Giarrusso Antonino,

Porri Lido

Publication year - 1997

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/marc.1997.030180908

Subject(s) - methylaluminoxane , tacticity , stereospecificity , polystyrene , materials science , yield (engineering) , polymer chemistry , polymer , polymerization , styrene , catalysis , metallocene , copolymer , organic chemistry , chemistry , composite material

The soluble catalyst system methylaluminoxane (MAO)‐Ni(acac), (acac: acetylacetonate) gives polystyrene consisting of an amorphous (aPS) and a crystalline isotactic (ips) fraction. Al(CH 3 ) 3 , which is always present in commercial samples of MAO, decreases both polymer yield and stereospecificity. The polymer yield increases with increasing the MAO/Ni ratio but, at the same time, the iPS/aPS ratio decreases. Addition of N(C 2 H 5 ) 3 (mole ratio N/Ni = 1) increases the proportion of the isotactic fraction, while it decreases the polymer yield. A tentative interpretation of the stereospecificity is reported.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here

Accelerating Research