The Manufacture, Properties, and Uses of Polyvinyl Formal

Fitzhugh, Andrew F.; Lavin, Edward H.; Morrison, George O.

doi:10.1149/1.2781132

Cited by 20 publications

(6 citation statements)

References 7 publications

(7 reference statements)

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“…A solvent process with concurrent hydrolysis and acetalization is used to produce PVF resin (21,(33)(34)(35). The hydrolysis of poly(vinyl acetate) and acetalization of the resultant poly(vinyl alcohol) to the formal are carried out concurrently in an aqueous acetic acid solution that also contains a strong mineral acid catalyst.…”

Section: Manufacturementioning

confidence: 99%

“…The resin is centrifuged and dried after washing with water to remove salt and organic by-products. Figure 4 is a flow diagram for the manufacture of PVF (33).…”

Section: Manufacturementioning

confidence: 99%

“…The acetate level for commercial PVB resins is usually low (0-3 wt%). However, comparatively higher acetate levels are produced for PVF resin grades to improve solubility at the expense of strength and dimensional stability (33). Residual vinyl acetate and vinyl alcohol contents are 9.5-13 wt% and 5.0-6.5 wt%, respectively, for commercial PVF grades available (21).…”

Section: Propertiesmentioning

confidence: 99%

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Vinyl Acetal Polymers

Wade¹

2003

Encyclopedia of Polymer Science and Technology

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Vinyl acetal polymers are terpolymers, with units of vinyl acetate, vinyl alcohol, and vinyl acetal reflecting the three reactions required for their manufacture. Manufacture involves several stages including vinyl acetate polymerization and either sequential or concurrent hydrolysis of poly(vinyl acetate) to poly(vinyl alcohol) and acetalization with an aldehyde in the presence of an acid catalyst. Only poly(vinyl butyral) and to a lesser extent poly(vinyl formal) continue to be made in sizeable commercial quantities. These polymers form hard, unpliable materials that are difficult to process without using solvents or plasticizers. Plasticized poly(vinyl butyral) interlayer for laminated safety glass is by far the largest single application for this class of polymers. Poly(vinyl butyral) provides flexible toughness over a wide range of temperatures and at a lower cost than vinyl acetal polymers derived from longer chain aldehydes. Where stiffer performance at higher temperatures is required, poly(vinyl formal) provides significant property advancement. Applications for vinyl acetal resins make use of their optical clarity, high pigment and filler binding capacity, and excellent adhesion to a variety of surfaces.

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Section: Manufacturementioning

confidence: 99%

“…The resin is centrifuged and dried after washing with water to remove salt and organic by-products. Figure 4 is a flow diagram for the manufacture of PVF (33).…”

Section: Manufacturementioning

confidence: 99%

Section: Propertiesmentioning

confidence: 99%

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Vinyl Acetal Polymers

Wade¹

2003

Encyclopedia of Polymer Science and Technology

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“…Poly(vinyl formal) (PVFM) prepared via condensation reaction of poly(vinyl alcohol) (PVA) with formaldehyde has been developed since 1924. Now it is widely used in manufactured enamels for heat-resistant wire insulations for electrical applications and in adhesives, water-resistant fibers, sponges (foamed plastics), implants for the human body, and membranes for reverse osmosis [1][2][3][4][5] . Interestingly, foamed PVFM has very special properties, such as high water absorption capability and strength and rigidity at dry state and excellent wear resistance and flexibility at wet state, comparing with the other traditional foamed plastics.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Polyvinyl Formal Sponge for Wound Care Dressing Application

Yang

Cheng

Zhang

2010

AMR

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In an effort to seek poly(vinyl formal) (PVFM) foams based wound dressing pad material, a series of foamed PVFM materials have been synthesized under varied conditions. The influence of conditions on the properties of PVFM foam, such as mechanical properties, water absorption, pore structure and bulk density, is well discussed individually. It has been shown that both the reactant and acid catalyst affect the degree and speed of acetalization, therefore the mechanical properties, pores continuity and water absorption of the resultant sample. The addition of Na2CO3, surfactant and CMCNa are mainly influencing the porous structure as well as the mechanical properties and water absorption. One best sample with balanced properties is obtained. It possesses higher mechanical strength and water absorption while the other properties are similar, comparing with a commercial surgical PVFM sponge (YJ-1) currently used.

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“…S2, ESI†) and is soluble in many organic solvents, allowing its electrospinning. 27 Nanofibers were loaded with 9.1 wt% 8HQ, or 9.1 wt% STZ, or a mixture of 9.1 wt% 8HQ and 9.1 wt% STZ and immersed in a buffer solution at pH 7.0. The PVF/8HQ, PVF/STZ and PVF/8HQ/STZ nanofibers displayed a well-defined structure and a smooth surface (Fig.…”

mentioning

confidence: 99%