Evaluation of kinetics parameters for poly(l-lactic acid) hydrolysis under high-pressure steam

Adnan, Ahmad Faris Mohd; Nishida, Haruo; Shirai, Yoshihito

doi:10.1016/j.polymdegradstab.2008.03.022

Cited by 73 publications

(40 citation statements)

References 32 publications

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“…When compared to calculated rate constants in the literature, values from both models were consistent with those obtained at similar temperatures [24,29,30].…”

Section: Molecular Weight Changessupporting

confidence: 82%

Degradation of PLA fibers at elevated temperature and humidity

Mitchell

Hirt

2014

Polymer Engineering & Sci

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The hydrolytic degradation of poly(lactic acid) (PLA) devices has previously been reported as size dependent for devices such as plates, microspheres, and films between 2 and 0.3 mm in thickness or diameter. In this study, the effect of fiber diameter on the degradation characteristics of PLA fiber of two diameters, 32 mm (PLA32) and 118 mm (PLA118), aged at 40, 60, and 80 C with 100% relative humidity, was investigated. Additionally, both PLA32 and PLA118 were aged at 40 and 60 C under nitrogen purge. The degradation of the fibers was evaluated based on changes in the total weight, crystallinity, and molecular weight of the samples. Both diameters exhibited similar total weight loss, crystallinity, and molecular weight loss profiles under each set of degradation conditions. Two models for the change in molecular weight were compared: a first order model and an autocatalytic model. For the obtained data, both models provided a reasonable fit of the molecular weight data. Based on the rate constants obtained for each model, the activation energy for PLA degradation was calculated (26.3 kcal mol 21 for the first order model and 22.4 kcal mol 21 for the autocatalytic model). The activation energies obtained were close to other values reported in the literature for PLA hydrolysis.

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“…When compared to calculated rate constants in the literature, values from both models were consistent with those obtained at similar temperatures [24,29,30].…”

Section: Molecular Weight Changessupporting

confidence: 82%

Degradation of PLA fibers at elevated temperature and humidity

Mitchell

Hirt

2014

Polymer Engineering & Sci

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“…Probably, the higher chain mobility enhanced the diffusion of water and resulted in ready hydrolytic degradation and a lower DE h value. Makino's values [15] are very similar to 87.2 kJ/mol, reported for hydrolytic degradation with high-pressure steam at 100-130 C [76]. For alkaline hydrolytic degradation of PDLLA dissolved in an alkaline solution, Kulkarni et al [19] reported a DE h value of 46 kJ/mol.…”

Section: Temperaturesupporting

confidence: 68%

Hydrolytic Degradation

Tsuji

2010

Poly(Lactic Acid)

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“…The most common of the biodegradable materials are poly(lactic acid) or polylactides, polycaprolactone, poly(butylene adipate terephthalate) and polyhydroxybutyrate. In this regard, poly(l-lactic acid) (PLLA), which benefits both from coming from renewable resources and being biodegradable in the compost environment [7], having functions such as hydrolysis, and thermal depolymerization [8,9] has attracted much attention. It has become an economically viable commodity plastic in industry and is employed to produce flexible packaging films for the food packaging industry, in addition to the common-use articles such as trays and bottles etc.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome these limitations, partially degradable polymers have been developed with a negotiation between cost and performance [20][21][22]. Therefore, the investigations concerning the total or partial substitution of synthetic plastics by biodegradable materials have proven to be very useful in solving the problem of plastic waste management to a significant extent [8,14,15,[23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and morphological properties of high density polyethylene and polylactide blends

Madhu

Bhunia

Bajpai

et al. 2014

Journal of Polymer Engineering

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Polyblend films were prepared from high-density polyethylene (HDPE) and poly(l-lactic acid) (PLLA) up to 20% PLLA by the melt blending method in an extrusion mixer with post-extrusion blown film attachment. The 80/20 (HDPE/PLLA) blend was compatibilized with maleic anhydride grafted polyethylene (PE-g-MA) in varying ratios [up to 8 parts per hundred of resin (phr)]. Tensile properties of the films were evaluated to obtain optimized composition for packaging applications of both non-compatibilized and compatibilized blends. The compositions HDPE80 (80% HDPE and 20% PLLA) and HD80C4 (80% HDPE, 20% PLLA and 4 phr compatibilizer) were found to be optimum for packaging applications. However, better tensile strength (at yield) and elongation (at break) of 80/20 (HDPE/PLLA) blend were noticed in the presence of PE-g-MA. Further, thermal properties and morphologies of these blends were evaluated. Differential scanning calorimetry (DSC) study revealed that blending does not much affect the crystalline melting point of HDPE and PLLA, but heat of fusion of 80/20 (HDPE/PLLA) blend was decreased as compared to that of neat HDPE. Spectroscopy studies showed evidence of the introduction of some new groups in the blends and gaining compatibility in the presence of PE-g-MA. The compatibilizer influenced the morphology of the blends, as apparent from scanning electron microscopy (SEM) and supported by Fourier transform infrared (FTIR).

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Evaluation of kinetics parameters for poly(l-lactic acid) hydrolysis under high-pressure steam

Cited by 73 publications

References 32 publications

Degradation of PLA fibers at elevated temperature and humidity

Degradation of PLA fibers at elevated temperature and humidity

Hydrolytic Degradation

Mechanical and morphological properties of high density polyethylene and polylactide blends

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