Degradation of l-polylactide during melt processing with layered double hydroxides

Publication: Research - peer-reviewConference article – Annual report year: 2012

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Degradation of l-polylactide during melt processing with layered double hydroxides. / Gerds, Nathalie; Katiyar, Vimal; Koch, Christian Bender; Hansen, Hans Christian Bruun; Plackett, David; Larsen, Erik Huusfeldt; Risbo, Jens.

In: Polymer Degradation and Stability, Vol. 97, No. 10, 2012, p. 2002-2009.

Publication: Research - peer-reviewConference article – Annual report year: 2012

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Gerds, Nathalie; Katiyar, Vimal; Koch, Christian Bender; Hansen, Hans Christian Bruun; Plackett, David; Larsen, Erik Huusfeldt; Risbo, Jens / Degradation of l-polylactide during melt processing with layered double hydroxides.

In: Polymer Degradation and Stability, Vol. 97, No. 10, 2012, p. 2002-2009.

Publication: Research - peer-reviewConference article – Annual report year: 2012

Bibtex

@article{80b80218b3ac46e39428bca4578abf04,
title = "Degradation of l-polylactide during melt processing with layered double hydroxides",
keywords = "LDH, PLA, Degradation, Additive, Catalytic depolymerization",
publisher = "Elsevier Ltd.",
author = "Nathalie Gerds and Vimal Katiyar and Koch, {Christian Bender} and Hansen, {Hans Christian Bruun} and David Plackett and Larsen, {Erik Huusfeldt} and Jens Risbo",
year = "2012",
doi = "10.1016/j.polymdegradstab.2012.04.014",
volume = "97",
number = "10",
pages = "2002--2009",
journal = "Polymer Degradation and Stability",
issn = "0141-3910",

}

RIS

TY - CONF

T1 - Degradation of l-polylactide during melt processing with layered double hydroxides

A1 - Gerds,Nathalie

A1 - Katiyar,Vimal

A1 - Koch,Christian Bender

A1 - Hansen,Hans Christian Bruun

A1 - Plackett,David

A1 - Larsen,Erik Huusfeldt

A1 - Risbo,Jens

AU - Gerds,Nathalie

AU - Katiyar,Vimal

AU - Koch,Christian Bender

AU - Hansen,Hans Christian Bruun

AU - Plackett,David

AU - Larsen,Erik Huusfeldt

AU - Risbo,Jens

PB - Elsevier Ltd.

PY - 2012

Y1 - 2012

N2 - <p>PLA was melt compounded in small-scale batches with two forms of laurate-modified magnesium–aluminum layered double hydroxide (Mg-Al-LDH-C<sub>12</sub>), the corresponding carbonate form (Mg-Al-LDH-CO<sub>3</sub>) and a series of other additives. Various methods were then adopted to characterize the resulting compounds in an effort to gain greater insights into PLA degradation during melt processing. PLA molecular weight reduction was found to vary according to the type of LDH additive. It is considered that the degree of particle dispersion and LDH exfoliation, and hence the accessibility of the hydroxide layer surfaces and catalytically active Mg site centers are causative factors for PLA degradation. Interestingly, the release of water under the processing conditions was found to have a rather small effect on the PLA degradation. Low loadings of sodium laurate also caused PLA degradation indicating that carboxylate chain ends may be active degrading agents. Phosphate treatment of laurate-modified LDH was investigated and this may be a promising way of reducing PLA degradation, thereby making such processes more practically realistic.</p>

AB - <p>PLA was melt compounded in small-scale batches with two forms of laurate-modified magnesium–aluminum layered double hydroxide (Mg-Al-LDH-C<sub>12</sub>), the corresponding carbonate form (Mg-Al-LDH-CO<sub>3</sub>) and a series of other additives. Various methods were then adopted to characterize the resulting compounds in an effort to gain greater insights into PLA degradation during melt processing. PLA molecular weight reduction was found to vary according to the type of LDH additive. It is considered that the degree of particle dispersion and LDH exfoliation, and hence the accessibility of the hydroxide layer surfaces and catalytically active Mg site centers are causative factors for PLA degradation. Interestingly, the release of water under the processing conditions was found to have a rather small effect on the PLA degradation. Low loadings of sodium laurate also caused PLA degradation indicating that carboxylate chain ends may be active degrading agents. Phosphate treatment of laurate-modified LDH was investigated and this may be a promising way of reducing PLA degradation, thereby making such processes more practically realistic.</p>

KW - LDH

KW - PLA

KW - Degradation

KW - Additive

KW - Catalytic depolymerization

U2 - 10.1016/j.polymdegradstab.2012.04.014

DO - 10.1016/j.polymdegradstab.2012.04.014

JO - Polymer Degradation and Stability

JF - Polymer Degradation and Stability

SN - 0141-3910

IS - 10

VL - 97

SP - 2002

EP - 2009

ER -