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Poly[ethylene-co-(vinyl alcohol)]-graft-poly(ε-caprolactone) Synthesis by Reactive Extrusion, 1 - Structural and Kinetic Study

✍ Scribed by Frédéric Becquart; Yvan Chalamet; Jianding Chen; Yanchao Zhao; Mohamed Taha

Publisher: John Wiley and Sons
Year: 2009
Tongue: English
Weight: 322 KB
Volume: 294
Category: Article
ISSN: 1438-7492
DOI: 10.1002/mame.200900134

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✦ Synopsis

Abstract

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.

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