Impact of Water on Rheological Behavior of Polyurethane Glues

Laiveniece, Laura; Morozovs, Andris

doi:10.1515/plua-2016-0002

Cited by 7 publications

(5 citation statements)

References 11 publications

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“…Previous research has also shown that when free water goes into polymeric structures, it can influence gelation processes and therefore the rheological behavior of the polymer. 66 Furthermore, when hydrogels are saturated in PBS, their bulk rheology changes with them now demonstrating a substantial elastic response with an increase in both the storage and loss modulus compared to non-saturated hydrogels. Taken together, the rheological behavior results of our bioscaffolds will depend on their water content following PBS saturation.…”

Section: Discussionmentioning

confidence: 99%

A collagen based cryogel bioscaffold coated with nanostructured polydopamine as a platform for mesenchymal stem cell therapy

Razavi

Thakor

2018

J Biomedical Materials Res

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Cryo-hydrogels (cryogels) are polymer hydrogels formed at sub-zero temperatures. Bioscaffolds created from cryo-gels have interconnected macropores which allow for cell migration, tissue-ingrowth, unhindered diffusion of solutes and mass transport of therapeutics. In this study, we developed collagen based cryogel bioscaffolds and coated them with polydopamine using a simple two-step technique. Cryogel bioscaffolds were synthesized by collagen crosslinking at −20°C and exhibited a macroporous interconnected architecture with 75% ± 63% porosity. Two groups of pore sizes were observed: 300 ± 50 μm and 30 ± 10 μm in diameter. The addition of a polydopamine coating to cryogel bioscaffolds was confirmed using composition analysis. This resulted in a 41% ± 6 5% decrease in water uptake, 81% ± 10% decrease in swelling rate and 12% ± 3% decrease in their degree of dissolution (p < 0.05), with a 48% ± 2% increase in stiffness and 57% ± 5% increase in compressive strength (p < 0.05). Seeding adipose tissue-derived mesenchymal stem cells (AD-MSCs) into polydopamine coated-cryogel bioscaffolds resulted in cells demonstrating a 52% ± 4% increase in viability and 33% ±3% increase in proliferation when compared to ADMSCs seeded into uncoated-cryogel bioscaffolds (p < 0.05). In summary, our novel polydopamine coated-cryogel bioscaffold represents an efficient and low-cost bioscaffold platform to support MSC therapies.

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Section: Discussionmentioning

confidence: 99%

A collagen based cryogel bioscaffold coated with nanostructured polydopamine as a platform for mesenchymal stem cell therapy

Razavi

Thakor

2018

J Biomedical Materials Res

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“…The poor dispersion of particles in the matrix led to weak stress transfer when the load was applied [53]. Thus, LAIVENIECE and MOROZOVS [54] confirm that higher fiber loading caused difficulties for the matrix in flowing through and led to weak stress transfer. Hence, better strength properties with 30% and 50% UF.…”

Section: Mechanical Propertiesmentioning

confidence: 97%

Ecological adhesive based on cassava starch: a sustainable alternative to replace urea-formaldehyde (UF) in particleboard manufacture

Mensah,

Melo,

Mitchual

et al. 2024

Matéria (Rio J.)

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This study assessed the properties of particleboard produced from the replacement of urea formaldehyde with cassava starch. Cassava starch (CS) and urea-formaldehyde (UF) were mixed at percentages of 100/0, 90/10, 70/30, 50/50, and 0/100, respectively. The mixture was added to the wood particles at 15% adhesive content based on the weight of oven-dried particles. Particleboards of sizes 20 mm × 300 mm × 300 mm and a targeted density of 600 kg m -3 were manufactured by hot-pressing at 170 °C, compacting pressure 3.5 MPa for 8 min. Physical and mechanical properties (density, thickness swelling, water absorption, static bending, and hardness) were tested. The physical and mechanical properties also increased in the highest proportions of UF. Comparatively, manufactured with 50% CS + 50% UF, it performed better in all the evaluated properties. Thus, it could adopt the latter mixed ratio in the industry to reduce the quantity and cost of UF and its environmental emissions. The results obtained were adequate and in conformity with international standards. Hence, it could mix cassava starch and urea formaldehyde adhesives in different ratios to get desirable properties. It is possible to conclude that cassava starch could be considered a sustainable alternative adhesive.

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“…As underlined before, the treatment product seem to be more concentrated in correspondence with the impregnation section. An evaluation of the reasons for an apparently random distribution must necessarily take into account variables such as the anatomy of the wood, the porosity, the direction of the fibers [18]. Is well known as wood shows a level of permeability related to its porous characteristics.…”

Section: Scientific Analysesmentioning

confidence: 99%

Assessment of consolidation treatments: micro-CT as a potential tool for material’s penetration detection

Buscaglia¹,

Baldi²,

Grassini³

et al. 2023

Proceedings of the 2022 IMEKO TC4 International Conference on Metrology for Archaeology and Cultural Heritage

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In the frame of an experimental study focused on structural reinforcement of wood by consolidation, developed during two master's theses in Conservation and Restoration of Cultural Heritage (Turin Universiy in collaboration with Centro Conservazione e Restauro La Venaria Reale), the potentials and limits of possible investigation techniques to verify the performances of the treatments, both superficially (optical and electron microscopy) and in terms of penetration (microtomography) were evaluated. This paper discusses the main preliminary results, with particular attention to the micro-CT measurements, carried out for detecting the penetration of consolidating materials into the wood. The results appear particularly encouraging in terms of potentialities of the diagnostic technique, taking also into consideration its non-invasiveness and, in perspective, of possible applications to real case studies, boosted in the case of addition of nanocomposites (metal particles) to traditional materials for consolidation.

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Impact of Water on Rheological Behavior of Polyurethane Glues

Cited by 7 publications

References 11 publications

A collagen based cryogel bioscaffold coated with nanostructured polydopamine as a platform for mesenchymal stem cell therapy

A collagen based cryogel bioscaffold coated with nanostructured polydopamine as a platform for mesenchymal stem cell therapy

Ecological adhesive based on cassava starch: a sustainable alternative to replace urea-formaldehyde (UF) in particleboard manufacture

Assessment of consolidation treatments: micro-CT as a potential tool for material’s penetration detection

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