Producing fibers of poly(vinyl alcohol): An alternative method

Sherman, Marie C.

doi:10.1021/ed069p883

Cited by 1 publication

(1 citation statement)

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“…An alternative process (17 ) is to pour the 4% PVA solution into a 150-mL beaker to a depth of about 2 cm. Add an equal depth of acetone, which will form a layer on the top of the PVA solution.…”

Section: Production and Plastification Of Pva Fibersmentioning

confidence: 99%

How To Learn and Have Fun with Poly(Vinyl Alcohol) and White Glue

1998

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The general behavior of Newtonian, shear-thinning, shear-thickening, thixotropic, negative thixotropic, and viscoelastic fluids is characterized and briefly discussed in terms of existing theoretical models. Whenever possible, examples of these types of fluids taken from everyday life are given for better understanding. This theoretical introduction is the basis for same, simple, and inexpensive laboratory work employing no special glassware and generally done by pairs of students. The work involves the synthesis of two well-known viscoelastic materials displaying unique properties: poly(vinyl alcohol) (PVA) and white glue, a poly(vinyl acetate)-based emulsion. The students are asked to perform a series of representative mechanical tests on both gels and to describe their observations in full detail. In particular, they are expected to recognize and identify the origin of the intriguing behaviors found (elasticity, spinability, self-siphoning effect, die-swell effect, Weissenberg effect). The tests include the preparation of fibers by extrusion, introducing concepts such as water solubility, hydrogen bonding, and glass transition temperature. The long list of questions, which ideally should be answered at the end of the laboratory work, allows the students to apply the new concepts acquired.

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Section: Production and Plastification Of Pva Fibersmentioning

confidence: 99%