Advances in the Properties of Polylactides Based Materials: A Review

Bhardwaj, Rahul; Mohanty, Amar K.

doi:10.1166/jbmb.2007.023

Cited by 94 publications

(60 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The spectra were measured in CDCl 3 , and the chemical shifts were calibrated to the solvent's residual proton signal ( 1 H NMR signal: δ 7.26 ppm for CHCl 3 ). The molecular weight and dispersity were determined by GPC (chloroform) (Agilent, Santa Clara, CA, USA).…”

Section: Characterization Techniques Employedmentioning

confidence: 99%

“…This linear, aliphatic thermoplastic polyester possesses many attractive characteristics, including biocompatibility, high modulus and the ability to be melt processed using conventional processing techniques such as extrusion and injection molding [3,4]. Despite all of its advantages, there are limitations such as its inherent brittleness, poor melt strength, narrow processing window and low thermal stability [4].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Maintaining Structural Stability of Poly(lactic acid): Effects of Multifunctional Epoxy based Reactive Oligomers

et al. 2014

View full text Add to dashboard Cite

Abstract:In order to reduce the effects of hydrolytic degradation and to maintain sufficient viscosity during processing of biomass based poly(L-lactic acid) (PLLA), various epoxy functional reactive oligomers have been characterized and incorporated into the degraded fragments as chain extenders. The molecular weight of PLLA increased with the increase in functionality of the reactive oligomers. No further increase in molecular weight was observed for oligomers with functionality of greater than five. Under our experimental conditions, no gelation was found even when the highest functionality reactive oligomers were used. This is attributed to the preferential reaction of the carboxylic acid versus the negligible reactivity of the hydroxyl groups, present at the two ends of the degraded PLLA chains, with the epoxy groups. The study provides a clear understanding of the degradation and chain extension reaction of poly(lactic acid) (PLA) with epoxy functional reactive oligomers. It is also shown that a higher functionality and concentration of the reactive oligomers is needed, to bring about a sufficient increase in the molecular weight and hence the hydrolytic stability in circumstances when PLA chains suffer significant degradation during processing.

show abstract

Section: Characterization Techniques Employedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Maintaining Structural Stability of Poly(lactic acid): Effects of Multifunctional Epoxy based Reactive Oligomers

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Many factors are believed to cause the deterioration in mechanical properties of PLA/starch blends. First, PLA has an inherent brittleness as evidenced by its relatively low tensile strain at break, and toughness [10,11] . Another explanation is linked to the inherent incompatibility between the hydrophilic starch and the hydrophobic PLA that affects the interfacial adhesion [5,7,[12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

Poly(lactic acid)/thermoplastic starch sheets: effect of adipate esters on the morphological, mechanical and barrier properties

et al. 2016

View full text Add to dashboard Cite

SbstractBlends of poly(lactic acid) (PLA) and thermoplastic starch (TPS) plasticized with adipate esters (diisodecyl adipate and diethyl adipate) having different molecular weight were used to produce sheets. The calendering-extrusion process at a pilot scale was used, and the mechanical, barrier, and morphological characterization of the obtained materials were performed. The increase in the TPS content affected the mechanical properties of the sheets by increasing the elongation and decreasing the rigidity. TPS conferred a more hydrophilic character to the sheets, as observed from the water vapor permeability results. The sheets plasticized with diisodecyl adipate (DIA), having a higher molecular weight, had better mechanical and barrier properties than diethyl adipate (DEA) plasticized sheets, indicating that DIA was more effective as plasticizer. Micrographs obtained by confocal laser microscopy and scanning electron microscopy showed different morphologies when different proportions of PLA and TPS were used (dispersed or co-continuous structures), which were strongly associated with the mechanical and barrier properties.

show abstract

“…First of all, PLA is a material with inherent brittleness. Earlier research has reported that PLA is, similar to polystyrene, with low ability of deformation [5]. Secondly, Native starch is of rigid granular structure, with the particle diameter ranging from 10 to 200 lm [6][7][8][9], varying with source, habitat, component and technique of production.…”

Section: Introductionmentioning

confidence: 99%

Poly(Ethylene Glycol) Grafted Starch Introducing a Novel Interphase in Poly(Lactic Acid)/Poly(Ethylene Glycol)/Starch Ternary Composites

2012

View full text Add to dashboard Cite

The main purpose of this study is challenging to dramatically improve the toughness of poly(lactic acid) (PLA)/starch by adding poly (ethylene glycol) (PEG) into the composites and grafting PEG molecules onto the surface of starch particles. It was found that the surface grafting of PEG onto starch induced the presence of PEGrich regions located around the starch particles, caused by migration and aggregation of free PEG molecules. A novel interphase transition layer between PLA and starch was formed, which showed great ability for cavitation and vested large-scaled plastic deformation to PLA matrix. Further mechanical properties tests indicated the formation of interphase layer significantly increase the elongation at break from 10.2 to 254.5%, and notched impact strength from 1.56 to 2.37 kJ/m 2 for PLA/PEG/starch ternary composites. The influence of PEG component, ethanol extraction and annealing was also investigated.

show abstract

Advances in the Properties of Polylactides Based Materials: A Review

Cited by 94 publications

References 0 publications

Maintaining Structural Stability of Poly(lactic acid): Effects of Multifunctional Epoxy based Reactive Oligomers

Maintaining Structural Stability of Poly(lactic acid): Effects of Multifunctional Epoxy based Reactive Oligomers

Poly(lactic acid)/thermoplastic starch sheets: effect of adipate esters on the morphological, mechanical and barrier properties

Poly(Ethylene Glycol) Grafted Starch Introducing a Novel Interphase in Poly(Lactic Acid)/Poly(Ethylene Glycol)/Starch Ternary Composites

Contact Info

Product

Resources

About