Mechanosorptive creep in nanocellulose materials

Lindström, Stefan B.; Karabulut, Erdem; Kulachenko, Artem; Sehaqui, Houssine; Wågberg, Lars

doi:10.1007/s10570-012-9665-9

Cited by 19 publications

(14 citation statements)

References 28 publications

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“…They argue that accelerated creep is a phenomenon consistent with sorption-induced stress-gradient explanations [7,11]. The recent results of Lindström et al [12] on nanocellulose materials seems to contradict this hypothesis since the MCS creep is not significantly affected by the through-thickness moisture gradient. Authors suggest that the MCS effect in this type of materials could be attributed to the interfibril bonds or possibly to the microfibrils themselves.…”

Section: Introductionmentioning

confidence: 92%

Creep behaviour of single hemp fibres. Part II: Influence of loading level, moisture content and moisture variation

et al. 2014

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This work investigates the tensile creep behaviour of single hemp fibres under constant and cyclic loading coupled to constant or variable moisture content environment. Results show that the primary creep strain rate of such fibres decreases with the increasing stress, while the secondary creep strain rate increases. Load cycling at an average load higher than constant creep load produces a large additional extra creep strain and an increase of the creep rate. Both primary and secondary creep strain rates increase with the increasing moisture content. More creep is also observed in cyclic humidity conditions than in a constant environment at the highhumidity. In agreement with some observations on synthetic fibres, we showed that this accelerated creep is only observed for high moisture cycling rates. This mechanosorptive effect is consistent with sorption-induced stressgradient explanations proposed in literature.

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Section: Introductionmentioning

confidence: 92%

Creep behaviour of single hemp fibres. Part II: Influence of loading level, moisture content and moisture variation

et al. 2014

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“…Fully restrained drying achieved a non-aligned film with relatively high strength characteristics relative to an unrestrained sample. Lindström et al (2012) investigated the effects of cyclic exposure to different humidities. The nanocellulose films and aerogels showed substantial creep behavior, indicating that creep was dominated by local events within the film during changes in humidity.…”

Section: Curing Processesmentioning

confidence: 99%

Nanocellulose in Thin Films, Coatings, and Plies for Packaging Applications: A Review

Hubbe

Ferrer

Tyagi

et al. 2017

BioRes

244

234

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This review article was prompted by a remarkable growth in the number of scientific publications dealing with the use of nanocellulose (especially nanofibrillated cellulose (NFC), cellulose nanocrystals (CNC), and bacterial cellulose (BC)) to enhance the barrier properties and other performance attributes of new generations of packaging products. Recent research has confirmed and extended what is known about oxygen barrier and water vapor transmission performance, strength properties, and the susceptibility of nanocellulose-based films and coatings to the presence of humidity or moisture. Recent research also points to various promising strategies to prepare ecologically-friendly packaging materials, taking advantage of nanocellulose-based layers, to compete in an arena that has long been dominated by synthetic plastics. Some promising approaches entail usage of multiple layers of different materials or additives such as waxes, high-aspect ratio nano-clays, and surface-active compounds in addition to the nanocellulose material.While various high-end applications may be achieved by chemical derivatization or grafting of the nanocellulose, the current trends in research suggest that high-volume implementation will likely incorporate water-based formulations, which may include water-based dispersions or emulsions, depending on the enduses. Resources; North Carolina State University, Raleigh, NC 27695, USA; b: Nalco Champion, an Ecolab Company, 7705 Highway 90-A, Sugar Land, TX 77478, USA; c: School of Clothing and Textiles, Jiangnan University, Wuxi, Jiangsu, China; d: Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, PO Box 16300, FI-00076 Aalto, Finland; * Corresponding author: hubbe@ncsu Table B -Barrier properties of NFC films 2144 2145 2145 2149 2151 2152 2153 2155 2155 2157 2157 2158 2158 2159 2159 2166 2170 2172 2173 2174 2175 2177 2179 2208 2208 2228 REVIEW ARTICLE bioresources.com . "Nanocellulose in packaging," BioResources 12(1), 2143-2233. 2144 Keywords: Barrier properties; Water vapor transmission; Food shelf life; Oxygen transmission; Packages; Cellulose nanomaterials Contact information: a: Department of Forest Biomaterials, College of Natural INTRODUCTIONThere has been explosive growth in the publication of peer-reviewed articles that combine key words related to "packaging" and "cellulose," in combination with the terms "nanocellulose," "nanocrystal*," or "nanofibril*". As of November 2016, a search of this combination of terms showed about as many publications since the start of 2015, compared to all preceding years combined. Given such an acceleration of research around the world, it makes sense to ask whether this high amount of research effort has yet borne significant fruit. In light of this question, the emphasis of this review article is on research publications that shed light on known challenges to the successful implementation of nanocellulose products to enhance the performance of packaging.In principle, a nano...

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“…Cellulose is a hygroscopic material and the properties of cellulose-based materials are well-known to be strongly dependent on the moisture content (Lindström et al 2012). Studies on cellulosic materials such as paper show that elastic moduli and tensile strength are significantly decreased at high relative humidity conditions (Bandyopadhyay et al 2000).…”

Section: List Of Symbolsmentioning

confidence: 99%

Thermal conductivity of hygroscopic foams based on cellulose nanofibrils and a nonionic polyoxamer

Apostolopoulou‐Kalkavoura

Gordeyeva

Lavoine

et al. 2017

Cellulose

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Nanocellulose-based lightweight foams are promising alternatives to fossil-based insulation materials for energy-efficient buildings. The properties of cellulose-based materials are strongly influenced by moisture and there is a need to assess and better understand how the thermal conductivity of nanocellulose-based foams depends on the relative humidity and temperature. Here, we report a customized setup for measuring the thermal conductivity of hydrophilic materials under controlled temperature and relative humidity conditions. The thermal conductivity of isotropic foams based on cellulose nanofibrils and a nonionic polyoxamer, and an expanded polystyrene foam was measured over a wide range of temperatures and relative humidity. We show that a previously developed model is unable to capture the strong relative humidity dependence of the thermal conductivity of the hygroscopic, low-density nanocellulose-and nonionic polyoxamer-based foam. Analysis of the moisture uptake and moisture transport was used to develop an empirical model that takes into consideration the moisture content and the wet density of the investigated foam. The new empirical model could predict the thermal conductivity of a foam with a similar composition but almost 3 times higher density.Accurate measurements of the thermal conductivity at controlled temperature and relative humidity and availability of simple models to better predict the thermal conductivity of hygroscopic, low-density foams are necessary for the development of nanocellulose-based insulation materials.

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Mechanosorptive creep in nanocellulose materials

Cited by 19 publications

References 28 publications

Creep behaviour of single hemp fibres. Part II: Influence of loading level, moisture content and moisture variation

Creep behaviour of single hemp fibres. Part II: Influence of loading level, moisture content and moisture variation

Nanocellulose in Thin Films, Coatings, and Plies for Packaging Applications: A Review

Thermal conductivity of hygroscopic foams based on cellulose nanofibrils and a nonionic polyoxamer

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