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HF Holzforschung

Publikationliste von Dr. Ralph Lehnen

  1. 0

    Bornholdt N, Lehnen R (2022) Cyclic carbonate functionalized lignin prepolymers as crosslinker for formaldehyde-free adhesives. In: Ek M, Lachenal D (eds) EWPL 2022 16th European Workshop on Lignocellulosics and Pulp June 28 - July 1, Gothenburg : Abstracts oral presentations. pp 173-176

  2. 1

    Lucht M, Lehnen R (2022) Formaldehyde-free route to synthesize aminated lignins for preparation of completely lignin based NIPU foams and adhesives. In: Ek M, Lachenal D (eds) EWPL 2022 16th European Workshop on Lignocellulosics and Pulp June 28 - July 1, Gothenburg : Abstracts oral presentations. pp 135-138

  3. 2

    Bornholdt N, Lehnen R, Dück K, Fliedner E (2021) Multifunctional cyclic organic carbonates as curing agents for organic compounds having phenolic hydroxyl groups, Patent WO2021033129A1. 31 p

  4. 3

    Bornholdt N, Fliedner E, Lehnen R (2020) Cyclische Carbonate als Vernetzer für Bioklebstoffe. Adhäs Kleb Dicht 64(7-8):45-47, DOI:10.1007/s35145-020-0132-8

  5. 4

    Bornholdt N, Fliedner E, Kühnel I, Lehnen R (2019) Cyclic carbonate functionalized lignin as non-toxic intermediate for renewable polymers. In: Proceedings of the 20th International Symposium on Wood, Fiber, and Pulping Chemistry - ISWFPC 2019 Yayoi Auditorium, The University of Tokyo, Japan, September 09-11, 2019.

  6. 5

    Purkus A, Lüdtke J, Becher G, Dieter M, Jochem D, Lehnen R, Liesebach M, Polley H, Rüter S, Schweinle J, Weimar H, Welling J (2019) Evaluation der Charta für Holz 2.0: Methodische Grundlagen und Evaluationskonzept. Braunschweig: Johann Heinrich von Thünen-Institut, 68 p, Thünen Rep 68, DOI:10.3220/REP1552650032000

    https://literatur.thuenen.de/digbib_extern/dn060917.pdf

  7. 6

    Kühnel I, Saake B, Lehnen R (2018) A new environmentally friendly approach to lignin-based cyclic carbonates. Macromol Chem Phys(1700613):1-6, DOI:10.1002/macp.201700613

  8. 7

    Kühnel I, Saake B, Lehnen R (2018) A novel environmentally friendly approach to lignin-based cyclic carbonates. In: Neto CP (ed) 15th European Workshop on Lignocellulosics and Pulp : EWLP 2018 : June 26-29, 2018, Aveiro, Portugal. pp 69-72

  9. 8

    Stücker A, Podschun J, Saake B, Lehnen R (2018) A novel quantitative 31P NMR spectroscopic analysis of hydroxyl groups in lignosulfonic acids. Anal Methods 10:3481-3488, DOI:10.1039/c8ay01272e

  10. 9

    Kühnel I, Akil Y, Lorenz D, Saake B, Lehnen R (2018) Cyclic organic carbonates as reagents for the functionalization of lignins and hemicelluloses. VTT Technol 340:133-138

  11. 10

    Akil Y, Castellani R, Lehnen R, Budtova T, Saake B (2018) Hydroxyalkylation of xylan using propylene carbonate: comparison of products from homo- and heterogeneous synthesis by HR-MASNMR and rheology. Cellulose 25(1):217-231, DOI:10.1007/s10570-017-1583-4

  12. 11

    Podschun J, Saake B, Lehnen R (2017) Catalytic demethylation of organosolv lignin in aqueous medium using indium triflate under microwave irradiation. React Funct Polym 119:82-86, DOI:10.1016/j.reactfunctpolym.2017.08.007

  13. 12

    Kühnel I, Saake B, Lehnen R (2017) Comparison of different cyclic organic carbonates in the oxyalkylation of various types of lignin. React Funct Polym 120:83-91, DOI:10.1016/j.reactfunctpolym.2017.09.011

  14. 13

    Kühnel I, Saake B, Lehnen R (2017) Oxyalkylation of lignin with propylene carbonate: influence of reaction parameters on the ensuing bio-based polyols. Ind Crops Prod 101:75-83, DOI:10.1016/j.indcrop.2017.03.002

  15. 14

    Abarro GJ, Podschun J, Diaz LJ, Ohashi S, Saake B, Lehnen R, Ishida H (2016) Benzoxazines with enhanced thermal stability from phenolated organosolv lignin. RSC Adv 6:107689, DOI:10.1039/c6ra22334f

  16. 15

    Kühnel I, Saake B, Lehnen R (2016) Cyclic organic carbonates as oxyalkylating reagents for lignin. In: Chirat C (ed) 14th European Workshop on Lignocellulosics and Pulp : proceedings for poster presentations ; June 28 - July 1st, 2016, Autrans - France. pp 79-82

  17. 16

    Podschun J, Saake B, Lehnen R (2016) Demethylation of organosolv lignin mediated by indium triflate in water. In: Chirat C (ed) 14th European Workshop on Lignocellulosics and Pulp : proceedings for poster presentations ; June 28 - July 1st, 2016, Autrans - France. pp 263-267

  18. 17

    Stücker A, Schütt F, Saake B, Lehnen R (2016) Lignins from enzymatic hydrolysis and alkaline extraction of steam refined poplar wood: utilization in lignin-phenol-formaldehyde resins. Ind Crops Prod 85:300-308, DOI:10.1016/j.indcrop.2016.02.062

  19. 18

    Akil Y, Lehnen R, Saake B (2016) Novel synthesis of hydroxyvinylethyl xylan using 4-vinyl-1,3-dioxolan-2-one. Tetrahedron Lett 57(37):4200-4202, DOI:10.1016/j.tetlet.2016.08.009

  20. 19

    Podschun J, Stücker A, Buchholz RI, Heitmann M, Schreiber A, Saake B, Lehnen R (2016) Phenolated lignins as reactive precursors in wood veneer and particleboard adhesion. I & EC Res 55(18):5231-5237, DOI:10.1021/acs.iecr.6b00594

  21. 20

    Akil Y, Lorenz D, Lehnen R, Saake B (2016) Safe and non-toxic hydroxyalkylation of xylan using propylene carbonate. Eur Polym J 77:88-97, DOI:10.1016/j.eurpolymj.2016.02.010

  22. 21

    Podschun J, Stücker A, Saake B, Lehnen R (2015) Lignin phenolation for improvement of performance and substitution level in technical polymers. In: Conference proceedings / 18th International Symposium on Wood, Fibre and Pulp Chemistry (ISWFPC), September 09 - 11, 2015, Vienna, Austria ; proceedings vol. 2. Wien: BOKU, pp 349-351

  23. 22

    Stücker A, Saake B, Lehnen R (2015) Oxidation of lignosulfonates by peroxyacetic acid - effect of pH and acid concentration. In: Conference proceedings / 18th International Symposium on Wood, Fibre and Pulp Chemistry (ISWFPC), September 09 - 11, 2015, Vienna, Austria ; proceedings vol. 2. Wien: BOKU, pp 355-358

  24. 23

    Podschun J, Saake B, Lehnen R (2015) Reactivity enhancement of organosolv lignin by phenolation for improved bio-based thermosets. Eur Polym J 67(1):1-11, DOI:10.1016/j.eurpolymj.2015.03.029

  25. 24

    Podschun J, Stücker A, Saake B, Lehnen R (2015) Structure-Function relationships in the phenolation of lignins from different sources. ACS Sustainable Chem Eng 3(10):2526-2532, DOI:10.1021/acssuschemeng.5b00705

  26. 25

    Kühnel I, Podschun J, Saake B, Lehnen R (2015) Synthesis of lignin polyols via oxyalkylation with propylene carbonate. Holzforsch 69(5):531-538, DOI:10.1515/hf-2014-0068

  27. 26

    Bäcker W, Becker K, Susanto A, Unkelbach G, Leschinsky M, Michels J, Fliedner E, Engel P, Schweppe R, Pohsner U, Böringer S, Zibek S, Naundorf M, Saake B, Lehnen R, Meier D, Kühnel I, Podschun J, Stücker A, et al (2014) "Lignocellulose-Bioraffinerie" : Aufschluss lignocellulosehaltiger Rohstoffe und vollständige stoffliche Nutzung der Komponenten (Phase 2) ; Gemeinsamer Abschlussbericht zu den wissenschaftlich-technischen Ergebnissen aller Teilvorhaben der Partner ; Projektzeitpunkt: 1.5.2010 bis 31.3.2014, Berichtszeitraum: 1.5.2010 bis 31.3.2014 [online]. Frankfurt a M: DECHEMA, 397 p, zu finden in <http://www.fnr-server.de/ftp/pdf/berichte/22019509.pdf> [zitiert am 16.10.2014]

  28. 27

    Lehnen R, Kühnel I, Podschun J, Saake B (2014) Biomass-based polyols through oxyalkylation of Organosolv lignin by propylene carbonate. In: Del Rio JC (ed) Proceedings of the 13th European Workshop on Lignocellulosics and Pulp (EWLP 2014) : Seville, Spain ; 24-27 June, 2014 . Seville: Institute of Natural Resources and Agrobiology, pp 147-150

  29. 28

    Meena R, Lehnen R, Saake B (2014) Microwave-assisted synthesis of kC/Xylan/PVP-based hydrogel materials: physicochemical and rheological studies. Cellulose 21(1):553-568, DOI:10.1007/s10570-013-0155-5

  30. 29

    Stücker A, Podschun J, Heitmann M, Lehnen R (2014) Organosolv lignin in Phenol-Formaldehyde resins - effect of molecular weight and lignin methylolation. In: Caldeira F (ed) Towards forest products and processes with lower environmental impact : 5th International Conference on Environmentally Compatible Forest Products. Porto: Editions University Fernando Pessoa, pp 251-261

  31. 30

    Podschun J, Stücker A, Saake B, Lehnen R (2014) Phenolation of lignins: Effect of structure on reactivity. In: Del Rio JC (ed) Proceedings of the 13th European Workshop on Lignocellulosics and Pulp (EWLP 2014) : Seville, Spain ; 24-27 June, 2014 . Seville: Institute of Natural Resources and Agrobiology, pp 655-658

  32. 31

    Podschun J, Stücker A, Saake B, Lehnen R (2013) Activated organosolv lignins as a substitute of phenol formaldehyde resins. In: Thermosets 2013 : from monomers to components : proceedings of the 3rd International Conference on Thermosets ; 18 - 20 September 2013, Berlin, Germany. Fraunhofer Research Institution for Polymeric Materials and Composites Pyco, pp 209-211

  33. 32

    Lehnen R, Podschun J, Stücker A, Saake B (2013) Modifiziertes Organosolv-Lignin als reaktive Komponente in Holzklebstoffen. In: 10. Holzwerkstoffkolloquium 2013 : Innovationen binden - Wert statt Wachstum ; 12.-13. Dezember 2013. Dresden: Institut für Holztechnologie, pp 87-98

  34. 33

    Meena R, Lehnen R, Schmitt U, Saake B (2013) Physicochemical and rheological properties of agarose/xylans composite hydrogel materials. Polym Compos (USA) 34(6):978-988, doi:10.1002/pc.22504

  35. 34

    Schmitt U, Koch G, Lehnen R (2013) Wood. In: Ullmann's encyclopedia of industrial chemistry. Weinheim: Wiley-VCH, pp 1-13, doi:10.1002/14356007.a28_305.pub2

  36. 35

    Meena R, Lehnen R, Schmitt U, Saake B (2011) Effect of oat spelt and beech xylan on the gelling properties of kappa-carrageenan hydrogels. Carbohydr Polymers 85(3):529-540, DOI:10.1016/j.carbpol.2011.03.002

  37. 36

    Saake B, Mende M, Schreiber A, Ziegler B, Lehnen R, Puls J (2011) Effect of raw material quality on the products of an organosolv based biorefinery. In: 16th International Symposium on Wood, Fibre and Pulping Chemistry, June 8-10, 2011, Tianjin, China. Tiajin: CTAPI, pp 809-812

  38. 37

    Puls J, Lehnen R, Schreiber A, Saake B (2011) Lignocellulose biorefinery : organosolv pretreatment and component separation. Sao Paulo: ABTCP, 7 p

  39. 38

    Lehnen R, Heitmann M, Flötotto A (2011) Organosolv lignin in phenol formaldehyde resins : evaluation of curing behaviour and wood bonding effectiveness. In: Proceedings / Nordic Wood Biorefinery Conference 2011 : 22-24 March 2011. Stockholm: Innventia AB, pp 180-185

  40. 39

    Windt M, Meier D, Lehnen R (2011) Quantification of polypropylene (PP) in wood plastic composites (WPCs) by analytical pyrolysis (Py) and differential scanning calorimetry (DSC). Holzforsch 65(2):199-207, doi:10.1515/HF.2011.024

  41. 40

    Lehnen R, Heitmann M, Mende M (2011) Untersuchungen zur Reaktivität von Lignin-Phenol-Formaldehyd Klebstoffen. In: Kunze W (ed) Anwenderseminar Die Kombination verschiedener Analysetechniken zur besseren Materialcharakterisierung / Würzburger Tage 2010. Eschborn: TA Instruments, pp 67-78

  42. 41

    Lehnen R, Heitmann M, Mende M (2010) Comparative investigations on the curing behaviour of lignin based pheno-formaldehyde resins. In: Proceedings / 11th European Workshop on Lignocellulosics and Pulp : August 16-19, 2010 Hamburg / Germany. Hamburg: Johann Heinrich von Thünen-Institut ; Zentrum Holzwirtschaft, Univ Hamburg, pp 573-576

  43. 42

    Saake B, Mende M, Ziegler B, Lehnen R, Puls J (2010) Effect of raw material and process parameters on organosolv lignin from beech wood. In: Proceedings / 11th European Workshop on Lignocellulosics and Pulp : August 16-19, 2010 Hamburg / Germany. Hamburg: Johann Heinrich von Thünen-Institut ; Zentrum Holzwirtschaft, Univ Hamburg, pp 289-292

  44. 43

    Puls J, Lehnen R, Schreiber A, Saake B (2010) The German lignocellulose biorefinery project. In: Proceedings / 11th European Workshop on Lignocellulosics and Pulp : August 16-19, 2010 Hamburg / Germany. Hamburg: Johann Heinrich von Thünen-Institut ; Zentrum Holzwirtschaft, Univ Hamburg, pp 303-306

  45. 44

    Windt M, Meier D, Lehnen R (2009) Quantification of polypropylene (PP) in wood plastic composites (WPC) with analytical pyrolysis and differential scanning calorimetry. In: Santi GF (ed) 17th European Biomass Conference : from research to industry and markets ; proceedings of the European Conference, held in Hamburg, Germany, 29 June - 3 July 2009. Florence: ETA-Florence Renewable Energies, pp 2237-2244

  46. 45

    Lehnen R (2009) Utilization of lignin as polymeric material : presentation for the 17th European Biomass Conference, June 29th 2009. In: Santi GF (ed) 17th European Biomass Conference : from research to industry and markets ; proceedings of the European Conference, held in Hamburg, Germany, 29 June - 3 July 2009. Florence: ETA-Florence Renewable Energies, p 16

  47. 46

    Lehnen R (2008) Phenol-Formaldehyd-Harze auf Basis Nachwachsender Rohstoffe. p

    https://literatur.thuenen.de/digbib_extern/dk039961.pdf

  48. 47

    Saake B, Lehnen R (2007) Lignin. In: Ullmann's encyclopedia of industrial chemistry. Weinheim: Wiley-VCH, p 21, DOI:10.1002/14356007.a15_305.pub3

  49. 48

    Ringena O, Janzon R, Pfizenmayer G, Schulte M, Lehnen R (2006) Estimating the hydrolytic durability of cured wood adhesives by measuring formaldehyde liberation and structural stability. Holz Roh Werkst 64(4):321-326, DOI:10.1007/s00107-005-0087-3

  50. 49

    Ringena O, Lebioda S, Lehnen R, Saake B (2006) Size-exclusion chromatography of technical lignins in dimethyl sulfoxide/water and dimethylacetamide. J Chromat A 1102(1-2):154-163, DOI:10.1016/j.chroma.2005.10.037

  51. 50

    Saake B, Abächerli A, Lebioda S, Ziegler B, Lehnen R (2006) The effect of sample preparation on the size-exclusion chromatography of technical lignins in organic solvents. In: Proceedings of the 9th European Workshop on Lignocellulosics and Pulp "Advances in Chemistry and Processing of Lignocellulosics", Wien/Österreich, 27.-30.08.2006. Wien: BOKU, pp 9-12

  52. 51

    Lehnen R, Heitmann M, Abächerli A, Ziegler B, Saake B (2006) The effect of sample preparation on the thermal analysis of technical lignins by differential scanning calorimetry. In: Proceedings of the 9th European Workshop on Lignocellulosics and Pulp "Advances in Chemistry and Processing of Lignocellulosics", Wien/Österreich, 27.-30.08.2006. Wien: BOKU, pp 354-357

  53. 52

    Ringena O, Saake B, Lehnen R (2005) Characterization of electrolyzed magnesium spent-sulfite liquor. Holzforsch 59(6):604-611, DOI:10.1515/HF.2005.098

  54. 53

    Ringena O, Saake B, Lehnen R (2005) Isolation and fractionation of lignosulfonates by amine extraction and ultrafiltration: a comparative study. Holzforsch 59(7):405-412, DOI:10.1515/HF.2005.066

  55. 54

    Lehnen R, Ringena O (2005) Modifizierte Lignosulfonsäuren (LSS) als Bindemittel für die Herstellung von witterungsbeständigen Holzwerkstoffen. Hamburg: BFH, 70 p, Arbeitsber Inst Holzchemie Chem Technol Holzes 2005/1

    https://literatur.thuenen.de/digbib_extern/dk040236.pdf

  56. 55

    Lehnen R, Ringena O (2004) Influence of electrochemical treatment on magnesium lignosulfonates. In: Eighth European workshop on Lignocellulosics and Pulp : Utilization of lignocellulosics and by-products of pulping, August 22-25, 2004, Proceedings, Riga/Latvia. pp 119-122

  57. 56

    Lehnen R, Saake B, Nimz HH (2002) Impact of pulping conditions on FORMACELL aspen lignin: investigation of methoxyl and ester groups, carbohydrates, molar mass and glass transition temperatures. Holzforsch 56(8):498-506, DOI:10.1515/HF.2002.077

  58. 57

    Heinemann C, Lehnen R, Humphrey PE (2002) Kinetic response of thermosetting adhesive systems to heat: physio-chemical versus mechanical responses. In: The 6th Pacific RIM bio-based composites symposium & workshop on the chmical modification of cellulosics, Portland, Oregon, USA, 2002, Volume 1. pp 34-44

  59. 58

    Lehnen R, Fabo A, Schwarz KU (2002) On the reaction of Polyethylenimine (PEI) and Polyvinylamine (PVAM) with wood components. In: Seventh European Workshop on Lignocellulosics and Pulp : towards molecular-level understanding of wood, pulp and paper, August 26-29, 2002, Proceedings, Turku/Abo, Finland. pp 431-434

  60. 59

    Lehnen R, Janneck T, Wolff S (2002) Polyethylenimine (PEI) and polyvinylamine (PVAM) as adhasives for medium density fiberboards (MDF). Lignovisionen 4:429-434

  61. 60

    Lehnen R, Saake B, Nimz HH (2001) Furfural and hydroxymethylfurfural as by-products of FORMACELL pulping. Holzforsch 55(2):199-204, DOI:10.1515/HF.2001.033

  62. 61

    Saake B, Lehnen R, Schmekal E, Neubauer A, Nimz HH (1998) Bleaching of formacell pulp from aspen wood and peracetic acid in organic solvents. Holzforsch 52(6):643-650, DOI:10.1515/hfsg.1998.52.6.643

  63. 62

    Nimz HH, Lehnen R, Lummitsch S (1996) Abwasserfreie Zellstoffgewinnung mit Reststoffverwertung. Umwelttechnik Forum 11(1):37-40

  64. 63

    Saake B, Lummitsch S, Mormanee R, Lehnen R, Nimz HH (1995) Erzeugung von Zellstoffen nach dem Formazell-Verfahren. Papier 49(10A):V1-V7

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