Degradation of L-polylactide during melt processing with layered double hydroxides
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Degradation of L-polylactide during melt processing with layered double hydroxides. / Gerds, Nathalie Christiane; Katiyar, Vimal; Bender Koch, Christian; Hansen, Hans Chr. Bruun; Plackett, David; Larsen, Erik Huusfeldt; Risbo, Jens.
In: Polymer Degradation and Stability, Vol. 97, No. 10, 2012, p. 2002-2009.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Degradation of L-polylactide during melt processing with layered double hydroxides
AU - Gerds, Nathalie Christiane
AU - Katiyar, Vimal
AU - Bender Koch, Christian
AU - Hansen, Hans Chr. Bruun
AU - Plackett, David
AU - Larsen, Erik Huusfeldt
AU - Risbo, Jens
N1 - 3rd International Conference on Biodegradable and Biobased Polymers (BIOPOL-2011) - Strasbourg 2011
PY - 2012
Y1 - 2012
N2 - PLA was melt compounded in small-scale batches with two forms of laurate-modified magnesium-aluminum layered double hydroxide (Mg-Al-LDH-C-12), the corresponding carbonate form (Mg-Al-LDH-CO3) 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. (C) 2012 Elsevier Ltd. All rights reserved.
AB - PLA was melt compounded in small-scale batches with two forms of laurate-modified magnesium-aluminum layered double hydroxide (Mg-Al-LDH-C-12), the corresponding carbonate form (Mg-Al-LDH-CO3) 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. (C) 2012 Elsevier Ltd. All rights reserved.
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
M3 - Journal article
VL - 97
SP - 2002
EP - 2009
JO - Polymer Degradation and Stability
JF - Polymer Degradation and Stability
SN - 0141-3910
IS - 10
ER -
ID: 43667084