Water transport and clustering behavior in homopolymer and graft copolymer polylactide

Du, An; Koo, Donghun; Theryo, Grayce; Cairncross, Richard A.

doi:10.1016/j.memsci.2011.12.030

Cited by 23 publications

(19 citation statements)

References 24 publications

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“…To confirm this clustering effect, the Zimm and Lundberg and ENSIC theories have been used to determine the extent of water vapor clustering. From the Zimm and Lundberg's theory and according to Figure , significant water clustering started at a w equal to zero in PHBV, at a water activity of 0.2 for PHBV/10WSF, 0.3 for PHBV/20WSF and 0.6 for WSF.…”

Section: Resultssupporting

confidence: 66%

Water vapor sorption and diffusion in wheat straw particles and their impact on the mass transfer properties of biocomposites

Wolf

Guillard

Angellier‐Coussy

et al. 2016

J of Applied Polymer Sci

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This work intends to decipher the role of hydrophilic fillers, wheat straw fibers (WSF), on the water vapor transfer properties (sorption and diffusion) of biocomposites based on poly(3-hydroxybutyrate-co-3-hydroxyvalerate), (PHBV) as matrix. Transfer in biocomposites, measured using dynamical vapor sorption measurement, is correlated to the transfer properties of each individual constituent and to the specific structural arrangements induced by the presence of particles inside the matrix. Increasing amounts of WSF particles in the PHBV matrix lead to an increase of the water vapor sorption (WVS) of the resulting composites. This is attributed to the high sorption of hydrophilic WSF as compared to that of the neat PHBV matrix. Water vapor diffusion in composites (around 0.13 × 10−11 m2 s−1 at 20°C whatever the filler content) is always lower than in the neat matrix (0.26 × 10−11 m2 s−1) although wheat straw displays high diffusivity values (1.84 × 10−11 m2 s−1). Such unexpected behavior is related to (1) changes of structure and properties of the WSF particle once embedded in the PHBV matrix, (2) changes in the polymer matrix structure and properties in contact with fibers, and also (3) to the representativeness of the filler diffusivity, which is difficult to appraise

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Section: Resultssupporting

confidence: 66%

Water vapor sorption and diffusion in wheat straw particles and their impact on the mass transfer properties of biocomposites

Wolf

Guillard

Angellier‐Coussy

et al. 2016

J of Applied Polymer Sci

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“…However, although remaining qualitatively correct, refining the UNIFAC‐vdW‐FV model by including water absorption data resulted in a distinct reduction in predictive accuracy (AAD = 343%), particularly for polymers with high water uptake (Table ). Decreased prediction accuracy at higher water concentrations may be indicative of UNIFAC‐vdW‐FV's inability to account for the formation of polymer‐bound and unbound states of water …”

Section: Resultsmentioning

confidence: 99%

“…Decreased prediction accuracy at higher water concentrations may be indicative of UNIFAC-vdW-FV's inability to account for the formation of polymer-bound and unbound states of water. 49,50…”

Section: Thermodynamic Affinitymentioning

confidence: 99%

Selecting polymers for two‐phase partitioning bioreactors (TPPBs): Consideration of thermodynamic affinity, crystallinity, and glass transition temperature

Bacon

Peterson

Parent

2015

Biotechnology Progress

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Two-phase partitioning bioreactor technology involves the use of a secondary immiscible phase to lower the concentration of cytotoxic solutes in the fermentation broth to subinhibitory levels. Although polymeric absorbents have attracted recent interest due to their low cost and biocompatibility, material selection requires the consideration of properties beyond those of small molecule absorbents (i.e., immiscible organic solvents). These include a polymer's (1) thermodynamic affinity for the target compound, (2) degree of crystallinity (wc ), and (3) glass transition temperature (Tg ). We have examined the capability of three thermodynamic models to predict the partition coefficient (PC) for n-butyric acid, a fermentation product, in 15 polymers. Whereas PC predictions for amorphous materials had an average absolute deviation (AAD) of ≥16%, predictions for semicrystalline polymers were less accurate (AAD ≥ 30%). Prediction errors were associated with uncertainties in determining the degree of crystallinity within a polymer and the effect of absorbed water on n-butyric acid partitioning. Further complications were found to arise for semicrystalline polymers, wherein strongly interacting solutes increased the polymer's absorptive capacity by actually dissolving the crystalline fraction. Finally, we determined that diffusion limitations may occur for polymers operating near their Tg , and that the Tg can be reduced by plasticization by water and/or solute. This study has demonstrated the impact of basic material properties that affects the performance of polymers as sequestering phases in TPPBs, and reflects the additional complexity of polymers that must be taken into account in material selection.

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“…It is assumed that the presence of such water clusters influences the barrier properties in polymers. [39] The formation of water clusters also depends on the polarity of the polymers. [40] The higher the hydrophobicity of the polymer matrix, the higher the formation rate of such water clusters.…”

Section: Discussionmentioning

confidence: 99%

“…[40] The higher the hydrophobicity of the polymer matrix, the higher the formation rate of such water clusters. [38,39] We studied PP, which is a hydrophobic polymer. [36,41] The result of our experiments is consistent with the literature.…”

Section: Discussionmentioning

confidence: 99%

Spatially resolved indiffusion behavior of Cu²⁺ and Ni²⁺ in polypropylene

Kern

Pradja

et al. 2020

J of Applied Polymer Sci

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Microplastics and their effects on the environment and food chain have become increasingly important in recent years. These polymer particles, which are only few millimeters in size or smaller, accumulate in the environment and can enter the human food chain via animals that ingest them. Moreover, they can accumulate impurities such as heavy metals. Therefore, this study focuses on the indiffusion behavior of metal ions into semicrystalline polypropylene (PP) applying time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) at cryo‐conditions. Diffusion coefficients of Cu2+ and Ni2+ in PP are determined by classical SIMS depth profiling in frozen state (T <−130°C) and subsequent data analysis according to Fick's second law of diffusion. The results show that diffusion of Cu2+ ions in dry PP (DPP,Cu = [2.21 ± 0.15]·10−12 cm2/s) is faster compared to Ni2+ ion diffusion of dry PP (DPP,Ni = [4.43 ± 0.55]·10−13 cm2/s). Interestingly, the diffusion of Cu2+ ions in water‐saturated PP (DPP,H2O,Cu = [1.91 ± 0.28]·10−13 cm2/s) is slower compared to Cu2+ ion diffusion in dry PP. Furthermore, high‐lateral resolution ToF‐SIMS analysis shows that metal ions only diffuse in certain areas of PP, which are most likely amorphous.

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Water transport and clustering behavior in homopolymer and graft copolymer polylactide

Cited by 23 publications

References 24 publications

Water vapor sorption and diffusion in wheat straw particles and their impact on the mass transfer properties of biocomposites

Water vapor sorption and diffusion in wheat straw particles and their impact on the mass transfer properties of biocomposites

Selecting polymers for two‐phase partitioning bioreactors (TPPBs): Consideration of thermodynamic affinity, crystallinity, and glass transition temperature

Spatially resolved indiffusion behavior of Cu²⁺ and Ni²⁺ in polypropylene

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Water transport and clustering behavior in homopolymer and graft copolymer polylactide

Cited by 23 publications

References 24 publications

Water vapor sorption and diffusion in wheat straw particles and their impact on the mass transfer properties of biocomposites

Water vapor sorption and diffusion in wheat straw particles and their impact on the mass transfer properties of biocomposites

Selecting polymers for two‐phase partitioning bioreactors (TPPBs): Consideration of thermodynamic affinity, crystallinity, and glass transition temperature

Spatially resolved indiffusion behavior of Cu2+ and Ni2+ in polypropylene

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Spatially resolved indiffusion behavior of Cu²⁺ and Ni²⁺ in polypropylene