Hosseinpourpia, Reza

[["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","BioResources"],["dc.bibliographiccitation.volume","13"],["dc.contributor.author","Hosseinpourpia, Reza"],["dc.contributor.author","Adamopoulos, Stergios"],["dc.contributor.author","Mai, Carsten"],["dc.date.accessioned","2020-12-10T18:42:43Z"],["dc.date.available","2020-12-10T18:42:43Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.15376/biores.13.1.331-345"],["dc.identifier.eissn","1930-2126"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/78054"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Effects of Acid Pre-Treatments on the Swelling and Vapor Sorption of Thermally Modified Scots Pine (Pinus sylvestris L.) Wood"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","161"],["dc.bibliographiccitation.journal","Polymer Degradation and Stability"],["dc.bibliographiccitation.lastpage","168"],["dc.bibliographiccitation.volume","138"],["dc.contributor.author","Hosseinpourpia, Reza"],["dc.contributor.author","Adamopoulos, Stergios"],["dc.contributor.author","Holstein, Nonna"],["dc.contributor.author","Mai, Carsten"],["dc.date.accessioned","2018-11-07T10:25:28Z"],["dc.date.available","2018-11-07T10:25:28Z"],["dc.date.issued","2017"],["dc.description.abstract","This study investigates the effect of proton acid pre-treatment and subsequent thermal modification at relatively low temperatures (up to 180 degrees C) on wood with respect to dimensional stability and water vapour sorption properties. The effects are compared to those of solely thermally-modified wood at higher temperatures (up to 250 degrees C). Scots pine sapwood (P. sylvestris L) was impregnated with a proton acid or demineralised water, and subsequently, thermally modified to various mass losses (ML). Acid pretreatment and thermal modification improved the dimensional stability and reduced the equilibrium moisture content (EMC) until certain ML. Excess surface work (ESW) obtained from vapour sorption studies indicated that, at comparable ML, the acid pre-treatment reduced the available sorption sites as compared to sole thermal treatment. Samples pre-treated with acid also showed stronger decreasing courses of EMC- and ESW-ratios than sole thermally modified ones. This was attributed to degradation of amorphous wood polymers and a stiffer matrix due to cross-linking of the cell wall polymers as a consequence of acid pre-treatment. Electron spin resonance (ESR) analysis indicated that acid pretreatment did not enhance the concentration of phenoxy radicals, whereas thermally modified wood showed a considerably higher concentration of phenoxy radicals, suggesting that high radical density cannot be used as an indicator for high matrix stiffness. (C) 2017 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.polymdegradstab.2017.03.009"],["dc.identifier.isi","000400222500018"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42863"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Elsevier Sci Ltd"],["dc.relation.issn","1873-2321"],["dc.relation.issn","0141-3910"],["dc.title","Dynamic vapour sorption and water-related properties of thermally modified Scots pine (Pinus sylvestris L.) wood pre-treated with proton acid"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","41290"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Journal of Applied Polymer Science"],["dc.bibliographiccitation.volume","132"],["dc.contributor.author","Hosseinpourpia, Reza"],["dc.contributor.author","Adamopoulos, Stergios"],["dc.contributor.author","Mai, Carsten"],["dc.date.accessioned","2018-11-07T10:02:10Z"],["dc.date.available","2018-11-07T10:02:10Z"],["dc.date.issued","2015"],["dc.description.abstract","The main objective of this study was to assess the effect of two amino resins, N-methylol melamine (NMM) and 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU), on the intrafiber and interfiber strengths and water absorption of two types of waste paper categories, office paper (OP), and old corrugated containers (OCCs). The tensile strength of individual fibers measured at zero span was reduced by increases in the resin concentrations. The dry tensile strengths of the recovered handsheets measured at a finite span were enhanced with increases in the weight percentage gain of the resins. The increasing of the resin concentration also significantly improved the intrabonding of the OP and OCCs in moist measuring conditions. The water absorption of the handsheets considerably decreased at the higher concentration of the thermosetting resins, especially with NMM. The results are promising for the use of NMM- and DMDHEU-treated recovered fibers as an alternative fiber resource for the production of laminated paper and also for the use of DMDHEU as a new N-methylol compound for laminated paper. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41290."],["dc.identifier.doi","10.1002/app.41290"],["dc.identifier.isi","000344006100011"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38174"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1097-4628"],["dc.relation.issn","0021-8995"],["dc.title","Tensile Strength of Handsheets from Recovered Fibers Treated with N-Methylol Melamine and 1,3-Dimethylol-4,5-dihydroxyethyleneurea"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","165"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Wood Science and Technology"],["dc.bibliographiccitation.lastpage","178"],["dc.bibliographiccitation.volume","50"],["dc.contributor.author","Hosseinpourpia, Reza"],["dc.contributor.author","Adamopoulos, Stergios"],["dc.contributor.author","Mai, Carsten"],["dc.date.accessioned","2018-11-07T10:21:31Z"],["dc.date.available","2018-11-07T10:21:31Z"],["dc.date.issued","2016"],["dc.description.abstract","Micro-veneers of wood and holocellulose (HC) were modified with the thermosetting resins phenol formaldehyde and melamine formaldehyde. The dynamic water vapour sorption of the modified and untreated veneers was studied in a dynamic vapour sorption apparatus to assess the effects of resin modification. The adsorption of wood and HC as well as the desorption of wood was little affected by the modification in the low relative humidity (RH) range but decreased in the RH range above 60-70 %. The desorption isotherm of HC, however, was increased in the RH range of 15-80 % due to modification. Resin modification gradually decreased the EMC ratio of wood and HC and also influenced the moisture increment, equilibrium time and sorption rate in RH range above 50-60 % RH for wood and above 70-80 % RH for HC. HC exhibited a clearly lower hysteresis than wood. Modification of wood slightly reduced hysteresis compared to untreated wood, but modification of HC clearly increased hysteresis about to the same extent as that of wood. This indicates that the stiffening effect of lignin and thermosetting resins reduces the flexibility of the HC matrix, which results in increased hysteresis."],["dc.description.sponsorship","German Academic Exchange Service (DAAD)"],["dc.identifier.doi","10.1007/s00226-015-0765-1"],["dc.identifier.isi","000367922200011"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42107"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1432-5225"],["dc.relation.issn","0043-7719"],["dc.title","Dynamic vapour sorption of wood and holocellulose modified with thermosetting resins"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","959"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Holzforschung"],["dc.bibliographiccitation.lastpage","966"],["dc.bibliographiccitation.volume","69"],["dc.contributor.author","Adamopoulos, Stergios"],["dc.contributor.author","Hosseinpourpia, Reza"],["dc.contributor.author","Mai, Carsten"],["dc.date.accessioned","2018-11-07T09:51:08Z"],["dc.date.available","2018-11-07T09:51:08Z"],["dc.date.issued","2015"],["dc.description.abstract","This study was conducted to explain the tensile strength loss of wood due to the modification with 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU) and glutaraldehyde (GA). Modified and control wood blocks were macerated to deliberate fibres, and handsheets were produced thereof. The nitrogen content of the fibres indicated that maceration removed the major proportions of DMDHEU. The stability of GA in wood during maceration was not assessed. Tensile strength determined at zero span (z-strength) and finite span (f-strength) was equal for the handsheets from DMDHEU-modified fibres and the control handsheets. The microscopic appearance of the tested finite-span paper strips from DMDHEU-modified fibres mainly indicated interfibre failure and did not differ from the fibre fracture mode of the control handsheets. In contrast, the z-strength of the handsheets from GA-modified fibres was lower than that of controls and decreased with increasing content of GA in the initial modified wood. The f-strength behaviour of the handsheets from GA-modified fibres was the opposite: it was higher than that of controls and increased with increasing GA content. The microscopic appearance of the rapture zones of the finite-span testing mainly indicated intrafibre failure for the GA-modified fibres. It was concluded that cross-linking is likely to be the major reason for tensile strength loss of GA- and DMDHEU-modified wood. In terms of DMDHEU-modified wood, the incrustation of the cell wall by the resin and the reduction in pliability could play an additional role."],["dc.identifier.doi","10.1515/hf-2014-0216"],["dc.identifier.isi","000361831200005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/35851"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Walter De Gruyter Gmbh"],["dc.relation.issn","1437-434X"],["dc.relation.issn","0018-3830"],["dc.title","Tensile strength of handsheets prepared with macerated fibres from solid wood modified with cross-linking agents"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]