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Vermiculite/poly(lactic acid) composites: Effect of nature of vermiculite on hydrolytic degradation in alkaline medium
https://orcid.org/0000-0001-6668-8192
AbstractUnmodified and different organomodified vermiculites were used for the preparation of poly(l-lactide) (PLLA) composites via melt mixing. The effect of the clay mineral surface modification, the type of organic modifier of the vermiculite and sample thickness on the degradation of PLLA in alkaline medium at 37°C was studied. The degradation was evaluated by analyzing mass loss, pH, molecular weights, and morphological changes. Alkaline hydrolysis of PLLA was accelerated by the presence of clay mineral and the degradation rate was very much dependent on type of clay mineral and state of dispersion. Morphological changes suggested that the erosion mechanism of polymer matrix occurred at the film surfaces and started at the interface of polymer and clay minerals. The results presented here show that the hydrolytic degradation of PLLA can be controlled through the preparation of nanocomposites introducing the appropriate organomodified nanoclay mineral.
Graphical abstract
HighlightsThe hydrolytic degradation of PLLA was accelerated by the presence of clay.The higher the degree of clay dispersion, the more pronounced is the degradation.Surface erosion mechanism of PLLA started at the interface between PLLA and clay.Hydrolytic degradation of PLLA can be controlled introducing the appropriate clay.
Vermiculite/poly(lactic acid) composites: Effect of nature of vermiculite on hydrolytic degradation in alkaline medium
https://orcid.org/0000-0001-6668-8192
AbstractUnmodified and different organomodified vermiculites were used for the preparation of poly(l-lactide) (PLLA) composites via melt mixing. The effect of the clay mineral surface modification, the type of organic modifier of the vermiculite and sample thickness on the degradation of PLLA in alkaline medium at 37°C was studied. The degradation was evaluated by analyzing mass loss, pH, molecular weights, and morphological changes. Alkaline hydrolysis of PLLA was accelerated by the presence of clay mineral and the degradation rate was very much dependent on type of clay mineral and state of dispersion. Morphological changes suggested that the erosion mechanism of polymer matrix occurred at the film surfaces and started at the interface of polymer and clay minerals. The results presented here show that the hydrolytic degradation of PLLA can be controlled through the preparation of nanocomposites introducing the appropriate organomodified nanoclay mineral.
Graphical abstract
HighlightsThe hydrolytic degradation of PLLA was accelerated by the presence of clay.The higher the degree of clay dispersion, the more pronounced is the degradation.Surface erosion mechanism of PLLA started at the interface between PLLA and clay.Hydrolytic degradation of PLLA can be controlled introducing the appropriate clay.
Vermiculite/poly(lactic acid) composites: Effect of nature of vermiculite on hydrolytic degradation in alkaline medium
https://orcid.org/0000-0001-6668-8192
AbstractUnmodified and different organomodified vermiculites were used for the preparation of poly(l-lactide) (PLLA) composites via melt mixing. The effect of the clay mineral surface modification, the type of organic modifier of the vermiculite and sample thickness on the degradation of PLLA in alkaline medium at 37°C was studied. The degradation was evaluated by analyzing mass loss, pH, molecular weights, and morphological changes. Alkaline hydrolysis of PLLA was accelerated by the presence of clay mineral and the degradation rate was very much dependent on type of clay mineral and state of dispersion. Morphological changes suggested that the erosion mechanism of polymer matrix occurred at the film surfaces and started at the interface of polymer and clay minerals. The results presented here show that the hydrolytic degradation of PLLA can be controlled through the preparation of nanocomposites introducing the appropriate organomodified nanoclay mineral.
Graphical abstract
HighlightsThe hydrolytic degradation of PLLA was accelerated by the presence of clay.The higher the degree of clay dispersion, the more pronounced is the degradation.Surface erosion mechanism of PLLA started at the interface between PLLA and clay.Hydrolytic degradation of PLLA can be controlled introducing the appropriate clay.
Vermiculite/poly(lactic acid) composites: Effect of nature of vermiculite on hydrolytic degradation in alkaline medium
Fernández, M. Dolores (author) / Fernández, M. Jesús (author)
Applied Clay Science ; 143 ; 29-38
2017-03-08
10 pages
Article (Journal)
Electronic Resource
English
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