Equipment design and requirements of biaxially stretched films

DeMeuse, Mark T.

doi:10.1533/9780857092953.1.14

Cited by 1 publication

(3 citation statements)

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“…The films are, for example, used in more advanced packaging applications, as a high-quality printing medium, as wear-resistant protective layers, in functional laminates and other high-strength film applications. The processing is by classical melt-processing and involves extrusion and biaxial drawing to induce in-plane molecular orientation …”

Section: Introductionmentioning

confidence: 99%

“…The processing is by classical melt-processing and involves extrusion and biaxial drawing to induce in-plane molecular orientation. 3 An alternative to high-strength films from petroleum-based polymers are cellulose nanofibril (CNF) films prepared from colloidal dispersions. CNFs can be readily disintegrated from chemical wood pulp (delignified) to form hydrocolloids; 4,5 and fibrils typically have diameters in the 3−15 nm range and lengths of 1−2 μm.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Moisture content was determined by measuring the weight increase compared to the initial weight when conditioned at 0% RH. Porosity is calculated based on the measurements of dimension and weight of each nanopaper film at 0% RH, with an estimated solid density of 1.58 g/cm 3 for the present CNF materials (cellulose/ hemicellulose mixture). Note that the absolute values of estimated porosities are sensitive to this assumption.…”

Section: ■ Introductionmentioning

confidence: 99%

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Polymer Films from Cellulose Nanofibrils—Effects from Interfibrillar Interphase on Mechanical Behavior

et al. 2021

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Dense polymeric films based on network-forming cellulose nanofibrils (CNFs) have excellent mechanical properties but are limited by moisture sensitivity. Here, interfibrillar effects from CNF surface properties are investigated. TEMPO-oxidized CNFs and two native CNFs are prepared with a similar length and width, to exclude geometrical effects. The CNFs have different surface properties in terms of sorbed hemicellulose content, hemicellulose molar mass, and surface charge. Moisture sorption, structural changes, and mechanical properties at different relative humidities are characterized. The presence of sorbed hemicelluloses in the interfibrillar interphase has favorable effects on the mechanical tensile properties. Surface-charged carboxyls increased moisture sorption and film thickness swelling and reduced the mechanical properties. A comparison with biaxially oriented polyethylene terephthalate films provides a perspective into the structure and properties of CNF films. The present study shows the importance of the interfibrillar interface and interphase region for mechanical film properties, including moisture effects.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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