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Poly[ethylene‐ co ‐(vinyl alcohol)]‐ graft ‐poly( ε ‐caprolactone) Synthesis by Reactive Extrusion, 1 ‐ Structural and Kinetic Study
Author(s) -
Becquart Frédéric,
Chalamet Yvan,
Chen Jianding,
Zhao Yanchao,
Taha Mohamed
Publication year - 2009
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200900134
Subject(s) - reactive extrusion , materials science , polyester , caprolactone , polymer chemistry , transesterification , grafting , vinyl alcohol , polymerization , extrusion , catalysis , chemical engineering , polymer , organic chemistry , composite material , chemistry , engineering
Chemical modification of EVOH in the molten state at 185 °C by a grafting from process of poly( ε ‐caprolactone) in batch was studied. 1 H NMR was used to characterize the structure evolutions of PCL grafts. In addition to grafting reactions, dynamic covalent transesterification reactions between EVOH residual alcohols and the polyester grafts led to a redistribution of the PCL grafts length. $\mathop {\overline {Dp} }\nolimits_n $ up to 27 and SR up to 80% were obtained. Experiments made in a corotating mini twin‐screw extruder also confirmed these results. The effect of the alcohol to caprolactone ratio and catalyst concentration (SnOct 2 ) on kinetic evolution showed that few minutes were necessary to complete the polymerization. A kinetic model was proposed and adequate conditions for the synthesis by reactive extrusion were defined.