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

Tsuji, Hideto; Tsuruno, Tomonori

doi:10.1002/mame.201000071

Cited by 79 publications

(55 citation statements)

References 49 publications

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“…But, complete sc‐PLA crystallites without any hc‐PLA could be formed by pouring PLLA/PDLA mixing solution into a nonsolvent (methanol) under strong stirring. From this we may certainly infer that external force may work on the formation of sc‐PLA …”

Section: Introductionmentioning

confidence: 88%

Effects of Temperature and External Force on the Stereocomplex Crystallization in Poly(lactic acid) Blends

et al. 2016

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An investigation of the effects of temperature and external force on the stereocomplex-type poly(lactide acid) formation between equimolar of poly(L-lactide acid) (PLLA) and poly(D-lactide acid) (PDLA) was conducted. Wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) analysis indicated that exclusive stereocomplex-type poly(lactide acid) (sc-PLA) with relatively high crystallinity could be obtained at lower (0°C) temperature. During solution mixing process, increasing stirring speed within range 0-200 rpm was conductive to the formation of sc-PLA. However, excessive stirring speed gave rise to a decrease in sc-PLA production. During solvent evaporation process, addition of shaking could effectively improve formation of sc-PLA, wherein crystallinity of sc-PLA approached the maximum value as shaking speed reach 100 rpm. These suggest that lower temperature and appropriate external force are positive to the formation of sc-PLA in PLLA/PDLA blends.

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Section: Introductionmentioning

confidence: 88%

Effects of Temperature and External Force on the Stereocomplex Crystallization in Poly(lactic acid) Blends

et al. 2016

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“…For PLA, it is known that the barrier properties are lower than those of PHBV. 1,9,10 Tsuji and Tsuruno 11 stated WVTR of PLA films with a thickness of 25 µm of 98 -224 g m -2 d -1 depending on their ratio of stereocomplexes.…”

Section: Blending Of Polyhydroxybutyrate-co-valerate With Polylactic mentioning

confidence: 99%

Blending of Polyhydroxybutyrate-co-valerate with Polylactic Acid for Packaging Applications – Reflections on Miscibility and Effects on the Mechanical and Barrier Properties

Jost¹

2015

Chem.Biochem.Eng.Q.

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Biopolymers for packaging applications offer many advantages and are therefore of increasing interest. In order to develop a sustainable alternative for petrochemical-based polymers the biobased and biodegradable polymers, the focus of this work are polyhydroxybutyrate-co-valerate (PHBV) and polylactic acid (PLA) (and copolymers). Blending of these two biopolymers was reviewed under thermodynamic aspects and backed with own results. Additionally, different ways of improving the miscibility were performed by compatibilisers, peroxides, transesterification catalysts, and by blending PHBV with modified molecular weight. These blends were extruded as cast films, and characterised by means of mechanical and barrier properties. This study analyses the miscibility of PLA and PHB-copolyester (with approximately equal molar masses) and reports on the unusually high barrier properties in PLA and PHBV blends. However, the quality of blending, especially regarding barrier properties to interphase boundaries, depends on the compatibility of the components and the morphology of the blend. Our results suggest that a PHBV content of 20-35 % in PLA is the most suitable blend system in terms of compatibility and high barrier properties.

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“…The stereocomplex polylactic acid (scPLA) 8 , 9 which is a special crystalline arrangement between enantiomeric PLAs 10 , has been an attraction for the researchers and studied extensively 11 . Due to its special crystalline arrangement, scPLA has superior thermal, mechanical and barrier properties than PLA 12 , 13 . Due to the chiral-complexation interaction between PLLA and PDLA chains, the melting point of scPLA is ~50 °C higher than PLLA or PDLA 8 .…”

Section: Introductionmentioning

confidence: 99%

Effects of Amphiphilic Chitosan on Stereocomplexation and Properties of Poly(lactic acid) Nano-biocomposite

Gupta

Pal

Woo

et al. 2018

Sci Rep

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This article demonstrates an elegant approach for the fabrication of high heat-stable PLA using an industrially viable technique i.e. melt extrusion, which is quite challenging due to the higher viscosity of poly(lactic acid) melt. scPLA has been fabricated by melt extrusion of PLLA/PDLA using nano-amphiphilic chitosan (modified chitosan, MCH) which has been synthesized by grafting chitosan with oligomeric PLA via insitu polycondensation of L-lactic acid that possibly increases the molecular surface area and transforms it into nano-amphiphilic morphology and in turn lead to the formation of stereocomplex crystallites. The effect of MCH loading on the structural, morphological, mechanical and thermal properties of PLLA/PDLA have been investigated. The modification of chitosan and formation of stereocomplexation in PLA has been confirmed by FTIR and XRD techniques, respectively. Heat treatment has also laid a significant effect on the stereocomplexation and the degree of crystallinity of stereocomplex crystallites has been increased to ~70% for 1.5 wt % MCH content with the absence of homocrystals. The heat deflection temperature is found to be more than 140 °C for the biocomposite with 1.5% MCH in comparison to ~70 °C for pristine scPLA. The biocomposites display significant improvement in UTS and Young’s modulus.

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

Cited by 79 publications

References 49 publications

Effects of Temperature and External Force on the Stereocomplex Crystallization in Poly(lactic acid) Blends

Effects of Temperature and External Force on the Stereocomplex Crystallization in Poly(lactic acid) Blends

Blending of Polyhydroxybutyrate-co-valerate with Polylactic Acid for Packaging Applications – Reflections on Miscibility and Effects on the Mechanical and Barrier Properties

Effects of Amphiphilic Chitosan on Stereocomplexation and Properties of Poly(lactic acid) Nano-biocomposite

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