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Reactive processing of LLDPEs with peroxides in counter‐rotating nonintermeshing twin‐screw extruder. IV. Effects of molecular structure of LLDPEs
Author(s) -
Lachtermacher Marly G.,
Rudin Alfred
Publication year - 1996
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(19960222)59:8<1213::aid-app2>3.0.co;2-f
Subject(s) - reactive extrusion , peroxide , extrusion , copolymer , plastics extrusion , polymer chemistry , materials science , organic peroxide , chemical engineering , chemistry , polymer , composite material , organic chemistry , engineering
The effects of reactive extrusion with peroxide have been compared for two linear lowdensity polyethylenes (LLDPEs). Resin C is a butene copolymer, while Resin B is an octene–ethylene copolymer. Both have similar molecular weight distributions, but Resin B is significantly richer in terminal vinyl groups. Under the same reactive extrusion conditions, Resin B is much more reactive. Resin C is easier to process in this system, producing products clean of microgel. Concurrently, however, a given peroxide level produces less molecular weight enhancement and long‐branch formation in Resin C. Reactive extrusion with peroxide is suitable to effect improvements in the processability of LLDPEs for film applications, provided that the choice of peroxide and the process details are tailored to the characteristics of the particular LLDPE. © 1996 John Wiley & Sons, Inc.