Reaction Mechanism of Hydroxymethylated Resorcinol Adhesion Promoter in Polyurethane Adhesives for Wood Bonding

Szczurek, Andrzej; Pizzi, A.; Delmotte, Luc; Celzard, Alain

doi:10.1163/016942410x500954

Cited by 8 publications

(1 citation statement)

References 9 publications

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“…Polyurethane was first studied by the German chemist, Bayer in 1937 [71] and is traditionally formed by reacting a diisocyanate (OCN-R-NCO) with a diol (HO-R-OH). Normally, PU is prepared from three constituents: a diisocyanate, a long chain diol (polyol), and short chain diol (chain extender) [72,73] forming segmented polymers with alternating hard and soft segments.…”

Section: Polyurethanesmentioning

confidence: 99%

Polymeric Materials as Platforms for Topical Drug Delivery: A Review

Teo,

Lee,

Rathbone

et al. 2017

Int J Pharm Pharm Sci

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With the emergence of novel and more effective drug therapies, increased importance is being placed upon the drug delivery technology. Topical formulations are attractive alternatives to oral formulations and offer several advantages, such as avoiding first-pass hepatic metabolism and gastric degradation. The major obstacle to drug delivery across the skin (transdermal) is the barrier nature of the skin which limits permeation of molecules. A wide range of polymeric materials is currently available for drug delivery to and across the skin. The synthetic polymers such as polyesters, polyamides, polyurethanes, polyanhydrides and poly(ortho-esters) display advantages of reproducibility of synthesis, a range of material properties and biodegradability, whereas agro-polymers like polysaccharides, proteins and lipids have already shown great promise in terms of type of material, range of properties, processing technique and biocompatibility. This review article summarizes features of different polymers and their potential applications in topical drug delivery system.

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Section: Polyurethanesmentioning

confidence: 99%

Polymeric Materials as Platforms for Topical Drug Delivery: A Review

Teo,

Lee,

Rathbone

et al. 2017

Int J Pharm Pharm Sci

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Coupling Agents: Basics and Classifications

Shokoohi

Ahmad

2012

Wiley Encyclopedia of Composites

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Improvement of tensile shear strength and wood failure percentage of 1C PUR bonded wooden joints at wet stage by means of DMF priming

Kläusler

Haß

Amen³

et al. 2014

Eur. J. Wood Prod.

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Tensile shear tests according to EN 302-1 for load-bearing timber structures were performed on European beech wood (Fagus sylvatica L.) and Douglas fir [Pseudotsuga menziesii (Mirb.) Franco] bonded by means of a one-component polyurethane adhesive (1C PUR). Results reveal a substantial loss of tensile shear strength (TSS) and wood failure percentage (WFP) at the wet stage compared to the dry stage. As can be seen from microscopic images, this is accompanied by a loss of adhesion at the boundary layer. Therefore, the aim of this work was to find a priming fluid that improves the load transmission between adhesive and adherend at the wet stage without introducing formaldehyde into the gluing process. A substantial improvement of TSS and WFP was achieved by means of the hygroscopic organic solvent N,N-dimethylformamide (DMF). In addition, contact angle measurements were carried out, revealing that DMF heavily enhances the wettability of the joining surface. Furthermore, it was attempted to integrate the outcomes into the swelling strain model stated by Frihart in 2009. By way of comparison a hydroxymethylated resorcinol coupling agent, a mixture of diphenylmethane-4,4 0-diisocyanate isomers and water were also tested as priming fluids. The data confirm that TSS and WFP of 1C PUR bonded wooden joints do not correlate, whilst WFP is mostly not normally (at wet stage often bimodally) distributed.

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Reaction Mechanism of Hydroxymethylated Resorcinol Adhesion Promoter in Polyurethane Adhesives for Wood Bonding

Cited by 8 publications

References 9 publications

Polymeric Materials as Platforms for Topical Drug Delivery: A Review

Polymeric Materials as Platforms for Topical Drug Delivery: A Review

Coupling Agents: Basics and Classifications

Improvement of tensile shear strength and wood failure percentage of 1C PUR bonded wooden joints at wet stage by means of DMF priming

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