Poly(vinyl acetal)s containing electron-donor groups: Synthesis in homogeneous phase and their thermal properties

Fernández, Mercedes; Fernández, María Tomé; Hoces, P.

doi:10.1016/j.reactfunctpolym.2007.10.012

Cited by 14 publications

(6 citation statements)

References 15 publications

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“…In this approach, butyl aldehyde is added to a PVA solution with a solvent capable of dissolving both the PVA and PVB. The acetalization reaction proceeds in a homogeneous system in which PVA molecular chains extend well, forming homogeneously distributed butyral group with an acetal content as high as 95%, verified by nuclear magnetic resonance (NMR). − In addition, no or little intermolecular crosslinking is involved in this approach. However, this approach requires special solvents, e.g., N -methyl-2-pyrrolidone, , dimethyl sulfoxide, a mixture of dimethyl formamide and benzene, as well as n -propanol, to dissolve PVA with a high degree of alcoholysis at high temperatures.…”

Section: Introductionmentioning

confidence: 92%

“…18−22 In addition, no or little intermolecular crosslinking is involved in this approach. However, this approach requires special solvents, e.g., N-methyl-2-pyrrolidone, 20,21 dimethyl sulfoxide, 18 a mixture of dimethyl formamide and benzene, 19 as well as n-propanol, 22 to dissolve PVA with a high degree of alcoholysis at high temperatures. This approach also requires separation and purification of products and recycling of the solvents at a high cost.…”

Section: Introductionmentioning

confidence: 99%

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Reverse Dissolution as a Route in the Synthesis of Poly(vinyl butyral) with High Butyral Contents

Yang

Liu

Huang

et al. 2013

Ind. Eng. Chem. Res.

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For applications in ultrafiltration membranes, cancer cell uptake, bioimaging, and diagnostics, a reverse dissolution approach, where swollen poly(vinyl alcohol) (PVA) particles are added to a butyraldehyde solution in ethanol, is employed to synthesize poly(vinyl butyral) (PVB) with high contents of butyral groups. The final butyral group content (up to 84%) of PVB is found to be dependent strongly on the initial condensed state of PVA, the degree of polymerization of PVA, the purity and volume of ethanol, and the pH value. A maximum of butyral group content may be obtained under conditions: swollen PVA particles, (95 vol %) ethanol of 125−150 mL, and pH 1. This reverse dissolution approach has advantages such as a mild reaction condition (70 °C), no predissolution of PVA at high temperatures, no vacuum removal of water during reaction, and low water consumption in post-treatment of the product.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Reverse Dissolution as a Route in the Synthesis of Poly(vinyl butyral) with High Butyral Contents

Yang

Liu

Huang

et al. 2013

Ind. Eng. Chem. Res.

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“…One way to incorporate an ether functionality is through the reaction of the latter hydroxyl groups with an epoxy group-containing functionalizing agent, leading to an oxirane opening. To bring about some hydrophobic character to PVA and to improve its surface activity, Wang and his co-workers [139] undertook the quaternization with a series of glycidyl-N-alkyl-N,N-dimethyl-ammonium chloride having fatty alkyl groups of different lengths (octyl, dodecyl, hexadecyl, octadecyl) (See Eq.21 above). The grafting extent ranged between 6.23 and 9.96%.…”

Section: Functionalization Through Ether Linkagementioning

confidence: 99%

Review: Poly(vinyl alcohol) Functionalizations and Applications

Moulay

2015

Polymer-Plastics Technology and Engineering

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Functionalizations of poly(vinyl alcohol) (PVA) congruent with the desired applications are herein discussed. The chemical modifications of PVA with different molecular weights and hydrolysis degrees via conventional chemistries, namely esterification, carbamation, etherification, and via the modern ones such as click chemistry, led to finished materials with a wide range of applications and uses: membrane fuel cells, biologicals and biomedicals, adsorption of heavy metals and other contaminants, molecular sensing or chemosensor for detection of some useful molecules or toxic ones, separation of mixtures, catalysis in organic and inorganic syntheses. Different forms of the duly modified PVAs were employed in such applications, including: hydrogels, films, membranes, and nanoparticles. The incorporated modifying agents onto PVA matrixes brought some changes that were in tune with the projected applications. These modifying agents were not confined to molecular compounds but also to macromolecular ones which are graphene, hyaluronic acid, β-cylcodextrin, polystyrene, poly(4-vinylpyridine), and poly(L-lactic acid). Downloaded by [University of Cambridge] at 07:33 23 August 2015 2

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“…The degree of acetalization was determined by 1 H-NMR spectra using Equation (1) [37]: (1) where (FA) is the mol% of vinyl acetal, A CH 2 represents the total peak area of methylene protons and A H 5 represents peak area of the H 5 protons which appears at 7.6 ppm. A typical procedure is presented below.…”

Section: Synthesis Of Poly(vinyl Furfural) (Pvf)mentioning

confidence: 99%

Investigation on the thermal properties of new thermo-reversible networks based on poly(vinyl furfural) and multifunctional maleimide compounds

Găină¹,

Ursache²,

Gaina³

et al. 2012

Express Polym. Lett.

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Abstract. New thermo-reversible networks were obtained from poly(vinyl furfural) and multifunctional maleimide monomers by Diels-Alder (DA) and retro-DA reactions. The poly(vinyl furfural) having acetalization degree of 15 and 25% were obtained by the acid-catalyzed homogenous acetalization of poly(vinyl alcohol) with 2-furfural in a nonaqueous media. The thermal and viscoelastic behaviour of the cross-linked materials have been studied via differential scanning calorimetry, dynamic mechanical analysis and thermogravimetric analysis. The networks exhibit considerable swelling in those organic solvents that dissolve both poly(vinyl furfural) and bismaleimides; by heating in aprotic dipolar solvents at 150°C, they become soluble.

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Poly(vinyl acetal)s containing electron-donor groups: Synthesis in homogeneous phase and their thermal properties

Cited by 14 publications

References 15 publications

Reverse Dissolution as a Route in the Synthesis of Poly(vinyl butyral) with High Butyral Contents

Reverse Dissolution as a Route in the Synthesis of Poly(vinyl butyral) with High Butyral Contents

Review: Poly(vinyl alcohol) Functionalizations and Applications

Investigation on the thermal properties of new thermo-reversible networks based on poly(vinyl furfural) and multifunctional maleimide compounds

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