Bonding of Isocyanates to Wood

Rowell, Roger M.; Ellis, William D.

doi:10.1021/bk-1981-0172.ch019

Cited by 38 publications

(27 citation statements)

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“…This is well documented elsewhere (Rowell et al 1981). Technically, the reaction is characterized as an addition reaction, which yields a cross-linked, substituted urea and carbon dioxide (Lay et al 1994).…”

Section: Introductionmentioning

confidence: 90%

Isocyanate Resins for Particleboard: PMDI vs EMDI

Papadopoulos¹,

Hill²,

Traboulay³

et al. 2002

Holz als Roh- und Werkstoff

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The purpose of this paper was to determine which of the isocyanate resins, PMDI or EMDI, was better for use in particleboard manufacture. It was found that particleboards bonded with EMDI exhibited superior mechanical properties to those bonded with PMDI. This was particularly noticeable when the resins were applied at a rate of 2%. At this low dosage EMDI satisfied EN 312 criteria for boards in interior fitments while 4% was needed to meet the requirements for load bearing panels in humid conditions. Isocyanatharze für die Herstellung von Spanplatten: Vergleich von PMDI und EMDIZweck dieser Arbeit war es, herauszufinden, welches der beiden Isocyanatharze, PMDI oder EMDI, besser geeignet ist für die Herstellung von Spanplatten. Die Ergebnisse zeigen, daß Spanplatten, die mit EMDI verleimt waren, bessere mechanische Eigenschaften aufwiesen. Besonders ergab sich dies bei einem Harzgehalt von 2%. Bei geringerer EMDI-Dosierung genügten die Platten den Anforderungen der EN 312 für Innenverwendung. Ein Einsatz von 4% war nötig, um den Anforderungen für belastete Platten in feuchter Ungebung zu entsprechen.

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Section: Introductionmentioning

confidence: 90%

Isocyanate Resins for Particleboard: PMDI vs EMDI

Papadopoulos¹,

Hill²,

Traboulay³

et al. 2002

Holz als Roh- und Werkstoff

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“…The HMDI content in mol Á g À1 or molality has been determined by weighing the dried polyol-impregnated wood (m iw ) and wood-polyurethane composite (m WPC ), taking into account the molar mass of HMDI (MM HMDI ) according to Equation (2).…”

Section: Synthesis Of Wood-polyurethane Composites (Wpcs)mentioning

confidence: 99%

“…Such an enhanced ASE value has been reported by others authors for various type of wood hydroxyl derivatizations. [1][2][3] One can remark that, while a large amount of polymer tends to leach out of the CH 3 -PEG-OH treated wood, it maintains a very high ASE at the second cycle. This observation might arise from the high amount of diisocyanate that was incorporated in the wood, preventing to some extent the expected PU formation by chain extension.…”

Section: Peg Functionalitymentioning

confidence: 99%

“…[1][2][3][4][5][6][7] The stability improvement is quantified through the determination of the antiswelling efficiency (ASE), i.e. the reduction of swelling of treated wood with respect to untreated wood.…”

Section: Introductionmentioning

confidence: 99%

“…An ASE value as high as 70% was reached after treatment of wood with a solution of butyl isocyanate in N,N-dimethylformamide (DMF). [1,2] More recently, end-grained wood samples have been chemically modified using different organosilicon anhydrides. This treatment has led to ASE values ranging from 40 to 70%, Summary: This paper is the second of a two-part series devoted to the preparation and the characterization of endgrained WPCs.…”

Section: Introductionmentioning

confidence: 99%

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End‐Grained Wood‐Polyurethane Composites, 2

Persenaire

Alexandre

Degée

et al. 2004

Macro Materials & Eng

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Summary: This paper is the second of a two‐part series devoted to the preparation and the characterization of end‐grained WPCs. WPCs were obtained by polycondensation and reactive grafting of PEG or PPG with diisocyanate derivatives within the wood structure. In this part of the study, the improvement of both the dimensional stability and mechanical properties were investigated. It came out that dimensional stability was influenced by the polyol nature, functionality, and content in wood. Both PEG and PPG appeared to be efficient to improve dimensional stabilization, especially at higher weight fraction in wood. A tuning of the impregnation conditions allowed to reach a dimensional stabilization as high as 70%. Performing compression and bending tests evidenced that the mechanical properties of the WPCs were not negatively affected by the reactive impregnation process. Moreover, it could be shown that the WPCs prepared starting from PPG displayed higher stiffness than PEG‐based WPCs.Schematic representation of the three‐layered wood cell wall.magnified imageSchematic representation of the three‐layered wood cell wall.

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Treatment of Caribbean pine by in situ polymerization of styrene and furfuryl alcohol

Magalhães

Silva²

2003

J of Applied Polymer Sci

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Caribbean pine impregnated by the full cell treatment schedule with styrene, furfuryl alcohol (FFA), and styrene-FFA monomers was cured for 48 h at 100°C. Styrene did not penetrate inside the wood cell wall; instead, it adhered on the cell wall surfaces and fill cell lumens. The volume contraction during the formation of polystyrene causes the volume contraction of the wood sample. The permanent volumetric swelling is attained only for samples treated with FFA, which is caused by cell wall impregnation. The dimensional stability of the treated wood samples is evaluated with the antiswell efficiency coefficient (ASE). The water repellency is expressed as the water-repellent effectiveness (WRE). Treatment with styrene improves the water repellence, whereas a double treatment increases the dimensional stability. Lixiviation slightly affects the ASE and WRE coefficients. The treatments improve the Shore D hardness in comparison to untreated wood.

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Bonding of Isocyanates to Wood

Cited by 38 publications

References 0 publications

Isocyanate Resins for Particleboard: PMDI vs EMDI

Isocyanate Resins for Particleboard: PMDI vs EMDI

End‐Grained Wood‐Polyurethane Composites, 2

Treatment of Caribbean pine by in situ polymerization of styrene and furfuryl alcohol

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