Maleation of polylactide (PLA) by reactive extrusion

Citation
D. Carlson et al., Maleation of polylactide (PLA) by reactive extrusion, J APPL POLY, 72(4), 1999, pp. 477-485
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science","Material Science & Engineering
Journal title
JOURNAL OF APPLIED POLYMER SCIENCE
ISSN journal
0021-8995 → ACNP
Volume
72
Issue
4
Year of publication
1999
Pages
477 - 485
Database
ISI
SICI code
0021-8995(19990425)72:4<477:MOP(BR>2.0.ZU;2-5
Abstract
Free-radical-initiated grafting of maleic anhydride (MA) onto a polylactide (PLA) backbone was performed by reactive extrusion. A concentration of 2 w t % MA in the presence of 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane (Lup ersol 101) as the free-radical initiator was used for all experiments. Two reaction temperatures were studied (180 and 200 degrees C) with a peroxide initiator concentration between 0.0 and 0.5 wt %. Under these conditions, b etween 0.066 and 0.672 wt % MA was grafted onto the PLA chains. Triple-dete ctor size-exclusion chromatography (TriSEC), melt flow index (MFI), and the rmal gravimetric analysis (TGA) were used to characterize the maleated PLA polymers. Increasing the initiator concentration resulted in an increase in the grafting of MA, as well as a decrease in the molecular weight of the p olymer. The maleation of PLA proved to be very efficient in promoting stron g interfacial adhesion with corn native starch in composites as obtained by melt blending. (C) 1999 John Wiley & Sons, Inc.