Mai, Carsten

[["dc.bibliographiccitation.firstpage","25"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","WOOD RESEARCH"],["dc.bibliographiccitation.lastpage","37"],["dc.bibliographiccitation.volume","55"],["dc.contributor.author","Hundhausen, Ulrich"],["dc.contributor.author","Militz, Holger"],["dc.contributor.author","Mai, Carsten"],["dc.date.accessioned","2018-11-07T08:48:41Z"],["dc.date.available","2018-11-07T08:48:41Z"],["dc.date.issued","2010"],["dc.description.abstract","Wood chips were first sprayed with pure alkenyl succinic anhydride (3 % wt/wt) and then cured (130 degrees C. h(-1)) with the objective to impart water repellency to UF-bonded particleboards. Unlike conventionally used paraffin wax, the anhydride can be covalently anchored to the chip surface by esterifying wood hydroxyl groups; however, the treatment resulted in increased thickness swelling (67%) after 2 h water submersion and decreased internal bond strength (IB; 0.10 N mm(-2)) as compared to controls (21 % and 0.95 N mm(-2)). Wettability studies revealed that the surface polarity was increased after the anhydride treatment. FTIR analyses before and after extraction of non-bonded anhydrides showed that esterification did not occur during the curing step. Viscosity measurements indicated that the non-bonded anhydride on the chip surface was hydrolyzed to a dicarboxylic acid by the aqueous glue, which in turn induced premature condensation before pressing and affected bonding. Investigations on veneer strips suggested that an esterification requires a solvent to provide the anhydride certain mobility for orientation. The hydrophobicity of pure alkenyl succinic anhydride seems to impair the attachment to wood hydroxyl groups and the spreading over the polar chip surface."],["dc.identifier.isi","000280247000004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21277"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Slovak Forest Products Research Inst"],["dc.relation.issn","1336-4561"],["dc.title","TREATMENT OF PARTICLEBOARD CHIPS WITH ALKENYL SUCCINIC ANHYDRIDE"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","283"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","European Journal of Wood and Wood Products"],["dc.bibliographiccitation.lastpage","288"],["dc.bibliographiccitation.volume","73"],["dc.contributor.author","Hundhausen, Ulrich"],["dc.contributor.author","Kloeser, Lars"],["dc.contributor.author","Mai, Carsten"],["dc.date.accessioned","2018-11-07T09:57:57Z"],["dc.date.available","2018-11-07T09:57:57Z"],["dc.date.issued","2015"],["dc.description.abstract","This study focuses on the development of up-scaling of modifications with maleic anhydride (MA) for the production of medium density fibreboards (MDF). In order to assess the effect of MA modification on the wood itself, preliminary investigations were carried out on spruce veneer strips treated with 10 (wt v(-1)) MA in dimethylsulfoxide (DMSO) prior to fibre modification and board manufacture. The veneers were cured at 150 A degrees C and showed cell wall bulking and anti-swell efficiency (ASE) of 2.3 +/- A 0.2 and 22 +/- A 3 % (mean value +/- A std), respectively, due to MA-treatment. Fibres treated with MA in DMSO and cured at 160 A degrees C were pressed to MDF by using polymeric diphenyl-methane-diisocyanate (PMDI) as adhesive. These boards showed a modulus of rupture and modulus of elasticity reduced by 50 and 20 % compared to those of control boards. Internal bond strength (IBS) and IBS after cook test of MA-treated MDF were approximately twofold and threefold higher than those of control boards. MA-treatment induced a minor reduction in water thickness swelling, but not in water uptake of the MA-treated MDF. The results indicate that MA-modifications cause severe degradation of the cell wall and do not result in considerable hydrophobation of solid wood and MDF, but improve bonding with PMDI."],["dc.identifier.doi","10.1007/s00107-015-0888-y"],["dc.identifier.isi","000353294300001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37273"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1436-736X"],["dc.relation.issn","0018-3768"],["dc.title","Usability of maleic anhydride as wood modification agent for the production of medium density fibreboards (MDF)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]