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Haslach, Henry W.

doi:10.1023/a:1009833415827

Cited by 125 publications

(33 citation statements)

References 24 publications

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“…1(a). Since the mechanical properties of paper depend on temperature and humidity [21,22], the tests were performed under constant conditions (23 • C, rH 50%) in a controlled testing chamber. The default sample size is 50 × 100 × 0.1 mm (width × height × thickness); the applied load was chosen so that the majority of the samples (for which largest statistics have been collected to measure the sample-to-sample fluctuations under identical loads) have typical lifetimes of 20 min maximum (see also the Supplemental Material (SM), Fig.…”

Section: Methodsmentioning

confidence: 99%

Predicting sample lifetimes in creep fracture of heterogeneous materials

et al. 2016

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Materials flow-under creep or constant loads-and, finally, fail. The prediction of sample lifetimes is an important and highly challenging problem because of the inherently heterogeneous nature of most materials that results in large sample-to-sample lifetime fluctuations, even under the same conditions. We study creep deformation of paper sheets as one heterogeneous material and thus show how to predict lifetimes of individual samples by exploiting the "universal" features in the sample-inherent creep curves, particularly the passage to an accelerating creep rate. Using simulations of a viscoelastic fiber bundle model, we illustrate how deformation localization controls the shape of the creep curve and thus the degree of lifetime predictability.

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Section: Methodsmentioning

confidence: 99%

Predicting sample lifetimes in creep fracture of heterogeneous materials

et al. 2016

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“…Paper shows an S-shaped sorption isotherm, indicating multilayer adsorption, and also a hysteresis effect between adsorption and desorption [10]. The moisture J Mater Sci (2018) 53:1-26 content of fibers fluctuates between *5 and 10% at 50% r.h. [49].…”

Section: Water Sorption Of Single Fibersmentioning

confidence: 99%

“…However, they are mentioned where this might help give readers some new ideas or where these properties are somehow related to hygroexpansion (e.g., shrinking [5], wet strength [6], hydroexpansion [7] or creep [8]). Effects related to humidity and dimensional stability have already been partially reviewed [9,10]. Also, hygroexpansion measurement techniques have been presented [11].…”

Section: Scope Aim and Demarcationmentioning

confidence: 99%

Factors affecting the hygroexpansion of paper

Lindner

2017

J Mater Sci

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Paper is a widely used packaging material and is nowadays regaining importance, e.g., as bio-based and biodegradable material. Moreover, new technologies such as polymer-fiber composites, printed electronics and the deep drawing of paper are developing. The process stability and also the resulting quality of paper converting processes such as coating, metallization, printing, and the printing of electronics are highly affected by the hygroexpansion of paper. In order to reduce production instability and to choose and develop paper substrates with ideal characteristics, critical parameters need to be known. This paper offers an extensive overview of those parameters, starting at a molecular and microscopic level with the effect of the constituents and morphology of single fibers, before moving on to paper contents, chemical modifications and additives and finally concluding with paper production and fiber network modification. It was found that the major influences are single fiber sorption, inter-fiber contacts, microfibril angle, fiber morphology (length, width, curliness) and fiber orientation. This review gives new ideas and insights for technologists working in research, development and production optimization of paper-based products.

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“…Cellulose nanofibres can be extracted in the form of individual microfibrils and/or their aggregations by deconstructing the cell wall structure . Cellulose nanofibre is composed of crystalline regions where cellulose chains are believed to align parallel to the axis of the nanofibre together with amorphous regions where cellulose chains are notordered (Haslach 2000). Crystalline regions are separated by amorphous regions at intervals of up to 800 Å , with individual cellulose molecules connecting several crystalline and amorphous regions (Haslach 2000;Salmén 1986).…”

Section: Introductionmentioning

confidence: 99%

Toughening mechanisms in cellulose nanopaper: the contribution of amorphous regions

Mao

Meng

et al. 2017

Cellulose

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Cellulose nanopaper is a strong and tough fibrous network composed of hydrogen bonded cellulose nanofibres. Upon loading, cellulose nanopaper exhibits a long inelastic portion of the stress-strain curve which imparts high toughness into the material. Toughening mechanisms in cellulose nanopaper have been studied in the past but mechanisms proposed were often rather speculative. In this paper, we aim to study potential toughening mechanisms in a systematic manner at multiple hierarchical levels in cellulose nanopaper. It was proposed that the toughness of cellulose nanopaper is not, as is often assumed, entirely caused by large scale inter-fibre slippage and reorientation of cellulose nanofibres. Here it is suggested that dominant toughening mechanism in cellulose nanopaper is associated with segmental motion of molecules facilitated by the breakage of hydrogen bonds within amorphous regions .

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Untitled

Cited by 125 publications

References 24 publications

Predicting sample lifetimes in creep fracture of heterogeneous materials

Predicting sample lifetimes in creep fracture of heterogeneous materials

Factors affecting the hygroexpansion of paper

Toughening mechanisms in cellulose nanopaper: the contribution of amorphous regions

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