Functional packaging materials: factors affecting the capacity and rate of water adsorption in desiccant composites

Kenyó, Csaba; Kajtár, Dóra Andrea; Renner, Karl; Kröhnke, Christoph; Pukánszky, Béla

doi:10.1007/s10965-013-0294-2

Cited by 20 publications

(22 citation statements)

References 48 publications

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“…The study of PLA/starch and PLA/starch-glycerol composites showed that starch could absorb a considerable amount of water in PLA, thus the absorption capacity of PLA/unplasticized starch composites were close to the patented and commonly applied polymer/zeolite desiccant composites [51]. The diffusion of water into PLA/starch composites obeyed Fick's laws, so the amount of absorbed water plotted against time gave a saturation curve.…”

Section: Discussionmentioning

confidence: 59%

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Desiccant effect of starch in polylactic acid composites

Móczó¹,

Kun²,

Fekete³

2018

Express Polym. Lett.

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Polylactic acid (PLA)/starch and PLA/starch-glycerol composites with different glycerol contents were prepared in a wide composition range, in order to study their applicability as packaging materials for dry products. Water uptake was determined at a temperature of 23°C and different relative humidities. Structure and mechanical properties were also investigated. PLA/ unplasticized starch composites could absorb a considerable amount of water. As a result, they may be adequate as a biodegradable inner container in dry packaging. The absorption capacity of the composites increased significantly with increasing starch content and relative humidity, respectively. Unplasticized starch exhibited not only a desiccant but also a reinforcing effect in PLA, thus both stiffness and strength increased with increasing starch loading. The influence of glycerol content on the water uptake was difficult to reveal due to the migration of glycerol from the bulk to the surface. Furthermore, glycerol weakened the PLA/starch adhesion and softened starch particles.

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Section: Discussionmentioning

confidence: 59%

“…In addition, the glycerol content also decreased both rates of starch. We can suppose that the reason of the large difference between the water diffusion rates of PLA and starch originated from the dissimilar free volume of the two polymers [51].…”

Section: Results and Discussion 31 Water Absorptionmentioning

confidence: 99%

Desiccant effect of starch in polylactic acid composites

Móczó¹,

Kun²,

Fekete³

2018

Express Polym. Lett.

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“…Fick's equations can be solved numerically or they can be expressed analytically using simplifications. 30 Two main approaches are used in practice, those describing the first part of the function plotting experimental results as the function of the square root of time, or those which use an exponential function. This approach gives a more accurate estimate at long times and it allows the estimation of the overall rate of dissolution and the maximum amount of dissolved material at infinite time (if the shape and structure of the device do not change, e.g.…”

Section: In Vitro Drug Releasementioning

confidence: 99%

<p>Electrospun PLA Fibers Containing Metronidazole for Periodontal Disease</p>

Budai-Szűcs

Léber

Cui

et al. 2020

DDDT

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Purpose: Electrospun PLA fiber devices were investigated in the form of fiber mats and disks. Metronidazole was used as an active agent; its concentration was 12.2 and 25.7 wt% in the devices. Methods: The structure was studied by X-ray diffraction and scanning electron microscopy, drug release by dissolution measurements, while the antimicrobial efficiency was tested on five bacterial strains. Results: The XRD study showed that the polymer was partially crystalline in both devices, but a part of metronidazole precipitated and was in the form of crystals among and within the fibers. Liquid penetration and dissolution were different in the two devices, they were faster in disks and slower in fiber mats, due to the morphology of the device and the action of capillary forces. Disks released the drug much faster than fiber mats. Although the release study indicated fast drug dissolution, the concentration achieved a plateau value in 24 hrs for the disks; the inhibition effect lasted much longer, 13 days for bacteria sensitive to metronidazole. The longer inhibition period could be explained by the slower diffusion of metronidazole located inside the fibers of the device. Conclusion: The results suggest that the devices may be effective in the treatment of periodontitis.

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“…the capacity and rate of water adsorption [22], other properties are also important for the application of polymer/zeolite composites as packaging materials. Usually stiffness, strength and deformability are the mechanical properties to consider.…”

Section: Propertiesmentioning

confidence: 99%

“…In view of these contradictions the goal of our study was to estimate interfacial interactions and reinforcement in polymer zeolite composites potentially used 4 as desiccant packaging materials. The desiccant characteristics of the composites have been evaluated and reported in another paper [22]. In this communication we focus on interfacial interactions and try to point out the difficulties in their estimation, show the effect of matrix characteristics and discuss some practical consequences.…”

Section: Introductionmentioning

confidence: 98%