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Graft Copolymers of Poly( M ethylmethacrylate) and Poly( L actic Acid) or Poly(3‐ H ydroxybutyrate): Synthesis by Reactive Extrusion and Characterization
Author(s) -
Frédéric Becquart,
Samira Touhtouh,
Mohamed Taha
Publication year - 2014
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.201300128
Subject(s) - reactive extrusion , copolymer , polymer chemistry , grafting , materials science , extrusion , methyl methacrylate , catalysis , chemistry , polymer , chemical engineering , organic chemistry , composite material , engineering
Poly(lactic acid) (PLA) and poly(3‐hydroxybutyrate) PHB are grafted onto poly(methyl methacrylate) (PMMA) by reactive extrusion. Two catalysts are used, 1.5.7‐triazabicyclodec‐5‐ene (TBD) and tin (II) bis(2‐ethylhexanoate) (SnOct 2 ). 1 H NMR spectroscopy is used to characterize the structures of the products of the reactive blends. A higher amount of graft copolymer is obtained by increasing the temperature. Grafting is also influenced by the type of catalyst. TBD is more efficient than (SnOct 2 ) for PHB grafting onto PMMA (substitution rate (SR) 19% at 230 °C). Likewise, when grafting PLA, significantly lower grafting is obtained and SnOct 2 is more efficient than TBD. Thermal analyses showed that amorphous and miscible products are obtained. In the case of PMMA‐ g ‐PHB synthesis, increasing the temperature improves the SR from 5 to 11% with SnOct 2 and from 14 to 24% with TBD. The same effect is observed in the case of PMMA‐ g ‐PLA synthesis. The results obtained by size exclusion chromatography corroborate both the results obtained by 1 H NMR analysis and the possibility to synthesize the copolymer by reactive extrusion with a short residence time. The results obtained by thermal analysis show that two T g are obtained in physical blends but that using a catalyst at low temperature yields in a miscible product.