Some important aspects in designing high molecular weight poly(<scp>L</scp>‐lactic acid)–clay nanocomposites with desired properties

Chowdhury, Subhendu Ray

doi:10.1002/pi.2464

Cited by 48 publications

(34 citation statements)

References 36 publications

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“…With respect to the gas permeability including water vapor permeability (WVP) of poly(lactide) [i.e., poly(lactic acid), PLA] based materials numerous investigations have been carried out. [11,[16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] Among the gas permeability, WVP is an important factor, when the polymers are used as food packages, containers, bottles, and so on. The molecular weight effect was insignificant for WVP of PLLA as far as the number-average molecular weight (M n ) was in the range of 9.2 Â 10 4 to 4.8 Â 10 5 g Á mol À1 .…”

Section: Introductionmentioning

confidence: 99%

Water Vapor Permeability of Poly(L‐lactide)/Poly(D‐lactide) Stereocomplexes

Tsuji

Tsuruno

2010

Macro Materials & Eng

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PLLA/PDLA blend films with only stereocomplex crystallites as a crystalline species together with pure PLLA and PDLA films with only homo‐crystallites as a crystalline species were prepared, and the effects of enantiomeric polymer blending, crystalline species, and crystallinity on the water vapor permeability were investigated. The WVT coefficient P of PLLA/PDLA blend films was 14–23% lower than that of pure PLLA and PDLA films in the crystallinity Xc range of 0–30%. Amorphous PLLA/PDLA blend films have a much lower P than pure PLLA and PDLA films. The dependence of P on Xc for blend films was stronger for Xc = 0–30% than for Xc = 30–100%. This dependence is discussed using the Nielsen model and the concept of “restricted” (or “restrained”) and “free” amorphous regions.

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Section: Introductionmentioning

confidence: 99%

Water Vapor Permeability of Poly(L‐lactide)/Poly(D‐lactide) Stereocomplexes

Tsuji

Tsuruno

2010

Macro Materials & Eng

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“…Chowdhury [44] investigated the effect of clay aspect ratio and functional edge groups on the degree of order of two different montmorillonite clays and one fluoromica. Nanocomposites were compared with each other as well as with pure PLLA.…”

Section: Polylactic Acidmentioning

confidence: 99%

Permeability in Clay/Polyesters Nano-Biocomposites

Sorrentino

Gorrasi

Vittoria

2012

Environmental Silicate Nano-Biocomposites

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In this chapter we focus on the barrier properties of nanocomposite of biodegradable polyesters with layered inorganic fillers. First of all, to better understand the influence of the lamellar inorganic fillers on the permeability, the theory of permeation and the barrier models so far developed for polymer nanocomposites are reviewed. Afterwards the barrier properties of the most important biodegradable polyesters filled with inorganic lamellar solids, such as Polylactic acid (PLA), Polycaprolactone (PCL), Polyhydroxbutyrate (PHB), and Polybutylenesuccinate (PBS) are reviewed and the outstanding results enlightened. As a general trend, the best improvement of barrier properties is related to the exfoliation of clay platelets into the polymeric matrix, and this in turn is dependent on the chemical structure of the clay, the organic modification, the filler concentration and the processing procedure to prepare the composite. Where possible, all these parameters were reported and correlated with the final properties. Also the contrasting effect of clays on the two parameters determining the water permeability, that is sorption and diffusion, is reported in many cases.

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“…However, nanoclay incorporation reportedly alters properties of polymers by nano building block formation in polymer matrix [6][7][8]. Nanoscale dispersion of nanoclay generates a tortuous path and enhances water barrier properties along with other properties improvements [6][7][8].…”

Section: Introductionmentioning

confidence: 98%

Electron beam modified nylon 6-clay nanocomposites: morphology and water absorption behavior

Chowdhury

Francis

Sarma

2014

Journal of Polymer Engineering

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Electron beam modified nylon 6-clay nanocomposites: morphology and water absorption behaviorAbstract: A series of nylon 6-clay nanocomposites were prepared by melt mixing, followed by electron beam (EB) crosslinking at various doses. Effects of crosslinking on clay dispersion, gel content, crystallinity and water absorption properties (hygrothermal) were studied. No change of the dispersion pattern of clay in nanocomposites was observed after crosslinking [from X-ray diffraction (XRD) and transmission electron microscopy (TEM)]. Gel content, i.e., degree of crosslinking is seen to keep on increasing with irradiation dose, although clays hinder crosslinking of polymers to some extent. Crystallinity of polymers is reduced after incorporation of clay as well as crosslinks. However, water absorption rate and maximum water content of nanocomposites are found to increase and saturation time to decrease with clay content. However, these changes become opposite after crosslinking of polymers. The water absorption for all samples is noticed to increase with temperature. Thus, EB crosslinking, without affecting the nanocomposite morphology, i.e., properties derived from nano interface generation, decreases the water absorption properties of nanocomposites.

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Some important aspects in designing high molecular weight poly(L‐lactic acid)–clay nanocomposites with desired properties

Cited by 48 publications

References 36 publications

Water Vapor Permeability of Poly(L‐lactide)/Poly(D‐lactide) Stereocomplexes

Water Vapor Permeability of Poly(L‐lactide)/Poly(D‐lactide) Stereocomplexes

Permeability in Clay/Polyesters Nano-Biocomposites

Electron beam modified nylon 6-clay nanocomposites: morphology and water absorption behavior

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