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|Title: ||Synthesis of EVA-g-PLA copolymers using transesterification reactions|
|Authors: ||Moura, I.|
Legare, Véronique Bounor
Machado, A. V.
Ethylene vinyl acetate
|Issue date: ||2012|
|Abstract: ||The synthesis of EVA-g-PLA grafted copolymers was carried out by reactive extrusion, through transesterification
reaction between ethylene vinyl acetate copolymer (EVA) and polylactide (PLA), using titanium
propoxide (Ti(OPr)4) and titanium phenoxide (Ti(OPh)4) as catalysts. Different materials were prepared
by changing the relative amount of polylactide and catalyst. The extent of the grafting reaction, which
depends on the quantity of polylactide and catalysts, was estimated by selective extractions. The influence
of the same parameters on the final structure, morphology and thermal and mechanical properties was
also evaluated. The results showed that Ti(OPr)4 exhibited higher efficiency as a catalyst than Ti(OPh)4.
Moreover, using the former catalyst, 25 wt.% of EVA-g-PLA copolymer was synthesized. The sample containing
the higher amount of copolymer exhibits the better properties and the higher biodegradability.|
|Appears in Collections:||IPC - Artigos em revistas científicas internacionais com arbitragem|
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