Studies on permeation through polymer latex films, I. Films containing no or only low levels of additives

Steward, Paul A.; Hearn, J.; Wilkinson, M. C.

doi:10.1002/pi.1995.210380101

Cited by 15 publications

(4 citation statements)

References 17 publications

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“…Examples of pore forming agents tested include small molecule additives (e.g., urea, glycerol, glucose, sucrose, etc.) [ 34 , 35 , 36 , 37 , 38 , 39 ] and water-soluble polymers (WSPs) (e.g., polyvinyl pyrrolidone (PVP), polyethylene glycol (PEG), etc.) [ 40 , 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

Porous Film Coating Enabled by Polyvinyl Pyrrolidone (PVP) for Enhanced Air Permeability of Fabrics: The Effect of PVP Molecule Weight and Dosage

Jiang

Shen

et al. 2020

Polymers

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This study developed a versatile and facile method for creating pores and tuning the porous structure in the polymer latex films by selectively etching the added functional polyvinyl pyrrolidone (PVP) molecules. The pore formed in the latex films had a similar morphology to that of PVP aggregation before etching. This observation promotes us to regulate the pore morphology that determines the film’s property, such as air permeability through varying the PVP molecule weight and dosage. To this end, the effects of PVP molecule weight and dosage on the pore formation were systematically studied. The results showed that the average pore size of porous film decreased from >10 μm to sub-micron (about 0.4 μm) as the molecular weight or the dosage of PVP increased. This was ascribed to the strong adsorption affinity of PVP molecule onto the latex particle surface, which further hindered the diffusion and self-assembly of PVP molecule. In addition, this interaction became much stronger when the higher molecule weight of PVP or the higher dosage of PVP was employed, leading to the decreased size of PVP aggregation, as well as the formed pores in the latex films. Furthermore, the addition of PVP had little effect on the color of coated fabric based on the results of CIE L*a*b* measurement. The proposed facile method can be used to improve the air permeability of coated fabrics.

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Section: Introductionmentioning

confidence: 99%

Porous Film Coating Enabled by Polyvinyl Pyrrolidone (PVP) for Enhanced Air Permeability of Fabrics: The Effect of PVP Molecule Weight and Dosage

Jiang

Shen

et al. 2020

Polymers

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“…Polymer particle coalescence and therefore the permeability can be difficult to control during drying of a coating. During drying the fusion of latex spheres is driven by polymer−water interfacial tension, capillary pressure, layer compression, and interparticle adhesion (9−13). Even after the coating has dried, further reduction in permeability can occur as a function of time, relative humidity, and temperature (12, 13).…”

Section: Introductionmentioning

confidence: 99%

Engineering the Microstructure and Permeability of Thin Multilayer Latex Biocatalytic Coatings Containing E. coli

Lyngberg

Thiagarajan

et al. 2001

Biotechnol. Prog.

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The microstructure and permeability of rehydrated 20-100 microm thick partially coalesced (vinyl-actetate acrylic copolymer) SF091 latex coatings and a 118 microm thick model trilayer biocatalytic coating consisting of two sealant SF091 layers containing a middle layer of viable E. coli HB101 + latex were studied as delaminated films in a diffusion apparatus with KNO(3) as the diffussant. The permeability of the hydrated coatings is due to diffusive transport through the pore space between the partially coalesced SF091 latex particles. Coating microstructure was visualized by fast freeze cryogenic scanning electron microscopy (cryo-SEM). The effective diffusion coefficient of SF091 latex coatings (diffusive permeability/film thickness) was determined as the ratio of the effective diffusivity of KNO(3) to its diffusivity in water (D(eff)/D). Polymer particle coalescence was arrested by two methods to increase coating permeability. The first used glycerol with coating drying at 4 degrees C, near the glass transition temperature (T(g)). The second method used sucrose or trehalose as a filler to arrest coalescence; the filler was then dissolved away. D(eff)/D was measured as a function of film thickness; content of glycerol, sucrose, and trehalose; drying time; and rehydration time. D(eff)/D varied from 3 x 10(-4) for unmodified SF091 coatings to 6.8 x 10(-2) for coatings containing sucrose. D(eff)/D was reduced by the flattening of latex particles against the surface of the solid substrate, as well as by the presence of the colloid stabilizer hydroxyethylcellulose (HEC). When corrected for the flattened particle layer, D(eff)/D of HEC-free coatings was as high as 0.20, which agreed with the value predicted from analysis of cryo-SEM images of the coat surface. D(eff)/D decreased by one-half in approximately 5 days in rehydrated SF091 coatings, indicating that significant wet coalescence occurs after glycerol, sucrose, or trehalose are leached from the films. D(eff)/D of SF091 latex trilayer coatings containing viable E. coli HB101 cells decreased as cell loading was increased from 2.2 x 10(-2) for 64 g dry cell weight per liter of coat volume to 5 x 10(-3) for 151 g DCW/L of coat volume. The reduction in coating permeability with increasing cell loading is predicted by Maxwell's equation for D(eff)/D in periodic composites.

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“…The mechanism of drug release from Eudragit RL and RS-based drug delivery systems has been proposed to take place through the control of fluid permeation and consequent dissolution and diffusion of the drug (41,42). It has been shown that drug diffusion is pH independent, which can be explained by the ionisation of the quaternary ammonium groups of the polymers at all pH levels with the gastrointestinal tract.…”

Section: Resultsmentioning

confidence: 99%

Solvent-free temperature-facilitated direct extrusion 3D printing for pharmaceuticals

Kuźmińska

Pereira

Habashy

et al. 2021

International Journal of Pharmaceutics

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Studies on permeation through polymer latex films, I. Films containing no or only low levels of additives

Cited by 15 publications

References 17 publications

Porous Film Coating Enabled by Polyvinyl Pyrrolidone (PVP) for Enhanced Air Permeability of Fabrics: The Effect of PVP Molecule Weight and Dosage

Porous Film Coating Enabled by Polyvinyl Pyrrolidone (PVP) for Enhanced Air Permeability of Fabrics: The Effect of PVP Molecule Weight and Dosage

Engineering the Microstructure and Permeability of Thin Multilayer Latex Biocatalytic Coatings Containing E. coli

Solvent-free temperature-facilitated direct extrusion 3D printing for pharmaceuticals

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