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

摘要: Abstract 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-CO 3 ) and a series other additives. Various methods were then adopted to characterize resulting compounds an effort gain greater insights into degradation during processing. molecular weight reduction found vary according type LDH additive. It is considered that degree particle dispersion exfoliation, hence accessibility layer surfaces catalytically active Mg site centers are causative factors for degradation. Interestingly, release water under processing conditions have rather small effect on Low loadings sodium laurate also caused indicating carboxylate chain ends may be degrading agents. Phosphate treatment investigated this promising way reducing degradation, thereby making such processes more practically realistic.