Effect of nucleation and plasticization on the crystallization of poly(lactic acid)

Li, Hongbo; Huneault, Michel A.

doi:10.1016/j.polymer.2007.09.020

Cited by 703 publications

(597 citation statements)

References 32 publications

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“…The decrease in Tg is a clear evidence of the plasticization effect. OES plasticizers allows chain mobility due to the free volume and reduced chain interactions [39]. In good agreement with previously described DMTA behavior, DSC shows a clear decrease in Tg with OES plasticizer.…”

Section: Figuresupporting

confidence: 90%

Plasticizing effect of biobased epoxidized fatty acid esters on mechanical and thermal properties of poly(lactic acid)

et al. 2016

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Poly(lactic acid)-PLA is a polyester that can be produced from lactic acid derived from renewable resources. This polymer offers attracting uses in packaging industry due to its biodegradability and high tensile strength. However, PLA is quite brittle, which limits its applications. To overcome this drawback, PLA was plasticized with epoxy-type plasticizer derived from a fatty acid, octyl epoxy stearate (OES) at different loading (1, 3, 5, 10, 15 and 20 phr). The addition of OES decreases the glass transition temperature and provides a remarkable increase in elongation at break and impact absorbed energy.Plasticizer saturation occurs at relatively low concentrations of about 5 phr OES; higher concentration leads to phase separation as observed by field emission scanning electron microscopy (FESEM). Optimum balanced mechanical properties are obtained at relatively low concentrations of OES (5 phr) thus indicating the usefulness of this material as environmentally friendly plasticizer for PLA industrial formulations.

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Section: Figuresupporting

confidence: 90%

Plasticizing effect of biobased epoxidized fatty acid esters on mechanical and thermal properties of poly(lactic acid)

et al. 2016

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“…All films (30 × 7 × 0.5 mm 3 ) were tested at a strain of 0.01% using a 3 °C min -1 , temperature ramp from -50 to 120 °C.…”

Section: Dynamic Mechanical Analysis (Dma)mentioning

confidence: 99%

“…PLA like most synthetic polymers from petroleum resources, which are rarely used alone by themselves, and needs to improve some properties by an inclusion of additives [2] . Poly (lactic acid) PLA has very low toxicity and high mechanical performance, comparable to other commercial polymers, for example, poly (ethylene terephthalate) (PET) and polystyrene (PS) [3][4][5] . It is highly transparent and has good barrier properties to aromas.…”

Section: Introductionmentioning

confidence: 99%

Biobased additive plasticizing Polylactic acid (PLA)

et al. 2015

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SbstractPolylactic acid (PLA) is an attractive candidate for replacing petrochemical polymers because it is from renewable resources. In this study, a specific PLA 2002D was melt-mixed with two plasticizers: triethyl citrate (TEC) and acetyl tributyl citrate (ATBC). The plasticized PLA with various concentrations were analyzed by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), melt flow index (MFI), thermogravimetric analysis (TGA), X-ray diffraction (XRD), UV-Visible spectroscopy and plasticizer migration test. Differential scanning calorimetry demonstrated that the addition of TEC and ATBC resulted in a decrease in glass transition temperature (T g ), and the reduction was the largest with the plasticizer having the lowest molecular weight (TEC). Plasticizing effect was also shown by decrease in the dynamic storage modulus and viscosity of plasticized mixtures compared to the treated PLA. The TGA results indicated that ATBC and TEC promoted a decrease in thermal stability of the PLA. The X-ray diffraction showed that the PLA have not polymorphic crystalline transition. Analysis by UV-Visible spectroscopy showed that the two plasticizers: ATBC and TEC have no effect on the color change of the films. The weight loss plasticizer with heating time and at 100°C is lesser than at 135 °C. Migration of TEC and ATBC results in cracks and changed color of material. We have concluded that the higher molecular weight of citrate in the studied exhibited a greater plasticizing effect to the PLA.

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“…These grades have different D-lactic monomer contents, 4.25 and 2% respectively [17][18][19][20], and weight average molecular weights, 212 and 207 kDa respectively, assessed by Gel Permeation Chromatography (GPC) [21]. Sheets with both materials were obtained by cast sheet extrusion in a single-screw COLLIN Teach-Line ® E16T extruder (T = 145-200°C, 50 rpm).…”

Section: Experimental Part 21 Materials and Processingmentioning

confidence: 99%

Fracture behavior of quenched poly(lactic acid)

Gámez‐Pérez¹,

Infante²,

Urquiza³

et al. 2011

Express Polym. Lett.

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The effect of a quenching treatment applied on heated cast sheet extruded films of two poly(lactic acid) (PLA)\ud commercial grades, with different optical purities, was studied. The thermal and mechanical properties of the films, as well\ud as their fracture behavior, were assessed by differential scanning calorimetry (DSC), tensile tests, and the essential work of\ud fracture (EWF) approach. The heating-quenching treatment causes a de-aging effect with an increase in the free volume of\ud polymer chains evidenced by a decrease in the glass transition temperature (Tg) and a decrease in the tensile stiffness and\ud yield stress. As a result, there is an abrupt increase in ductility, finding a dramatic change in the fracture behavior, from brittle\ud to ductile. The use of digital image correlation (DIC) of the strain field analysis during fracture testing has allowed relating\ud the decrease on the yield stress promoted by quenching with the crack propagation kinetics. The use of the EWF method\ud to characterize the fracture toughness of PLA has allowed to measure this enhancement on toughness, finding that the specific\ud essential work of fracture (we) and the plastic term (!wp) parameters increased 120% and 1200%, respectively, after\ud the quenching process.Peer ReviewedPostprint (published version

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Effect of nucleation and plasticization on the crystallization of poly(lactic acid)

Cited by 703 publications

References 32 publications

Plasticizing effect of biobased epoxidized fatty acid esters on mechanical and thermal properties of poly(lactic acid)

Plasticizing effect of biobased epoxidized fatty acid esters on mechanical and thermal properties of poly(lactic acid)

Biobased additive plasticizing Polylactic acid (PLA)

Fracture behavior of quenched poly(lactic acid)

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