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The copolymerization of methacrylates in a counter‐rotating twin‐screw extruder
Author(s) -
Jongbloed H. A.,
Mulder R. K. S.,
Janssen L. P. B. M.
Publication year - 1995
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760350705
Subject(s) - materials science , copolymer , barrel (horology) , plastics extrusion , monomer , extrusion , polymerization , polymer chemistry , ceiling (cloud) , impact resistance , reactivity (psychology) , polymer , composite material , chemical engineering , structural engineering , engineering , medicine , alternative medicine , pathology
The copolymerization of n‐butylmethacrylate with 2‐hydroxypropylmethacrylate was studied in a closely intermeshing counterrotating twin‐screw extruder. The average molecular weight of the product can be increased by increasing the screw rotation rate or the die resistance or by decreasing the throughput or the barrel temperature. The conversion can be improved by decreasing the throughput, increasing the die resistance, and (within limits) increasing the barrel temperature, as well as through post‐initiation. Compared with various classical polymerization processes, this situation requires that particular attention be paid to the occurrence of a gel effect, the existence of a thermodynamic ceiling temperature, and the reactivity ratio of the monomers used.