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  1. Effects of desiccation on temperate recalcitrant seeds: differential scanning calorimetry, gas chromatography, electron microscopy, and moisture studies on Quercus nigra and Quercus alba

    Investigations into the nature of desiccation-sensitive, or recalcitrant, seed behavior have as yet failed to identify exact causes of this phenomenon. Experiments with Quercus nigra L. and Quercus alba L. were conducted to examine physiological and biochemical changes brought about by seed desiccation and to determine if there...

    Author(s):
    K.F. Connor; F.T. Bonner; J.A Vozzo
    Year:
    1996
    Keywords:
    Quercus nigra, Quercus alba, moisture content, lipids, cell wall integrity, recalcitrant seeds
    Source:
    Can. J. For. Res. 26:1813-1821

  2. The effects of desiccation on seeds of Acer saccharinum and Aesculus pavia: recalcitrance in temperate tree seeds

    This study was undertaken to determine how the results from lipid, moisture, and differential scanning calorimetry analyses conducted on silver maple (Aceraceae: Acer saccharinum L.) and red buckeye (Hippocastanaceae: Aesculus pavia L.) compared with those obtained from previous studies on white and water oaks (Fagaceae:

    Author(s):
    Kristina F. Connor; Franklin T. Bonner
    Year:
    2001
    Keywords:
    recalcitrance, Aesculus pavia, Acer saccharinum, lipids, moisture content, viability
    Source:
    Trees 15:131-136

  3. Multiphase materials with lignin. VI. Effect of cellulose derivative structure on blend morphology with lignin

    Polymeric blends of lignin with ethyl cellulose (EC) and cellulose acetate/butyrate (CAB) prepared by solution casting from dioxane. Fracture surface analysis by scanning electron microscopy revealed phase separation when the lignin content exceeded 10% for blends with EC and 5% in the CAB system. While this phase behavior is as predicted for the EC blends, a greater...

    Author(s):
    Timothy G. Rials; Wolfgang G. Glasser
    Year:
    1989
    Keywords:
    Polymer blends, lignin, cellulose derivatives, phase behavior, glass transition temperature
    Source:
    Wood & Fiber Science 21(1):80-90

  4. Morphology and properties of wood-fiber reinforced blends of recycled polystyrene and polyethylene

    Material properties of composites produced from recycled plastics and recycled wood fiber were compared. A blend of high-density polyethylene and polystyrene was used as a simulated mixed plastic. Stiffness was generally improved by the addition of fiber, as expected, but brittleness also increased. Pre-treatment of the wood filler with phenol-formaldehyde resins did...

    Author(s):
    John Simonsen; Timothy G. Rials
    Year:
    1996
    Keywords:
    Wood/polymer composite, polystyrene, polyethylene, recycled, plastics
    Source:
    Journal of Thermoplastic Composite Materials 9:292-302

  5. The reaction of boric acid with wood in a polystyrene matrix

    The reaction of boric acid with wood fibers in a polymer melt was examined using 13C-nuclear magnetic resonance (NMR), 11B-NMR. differential scanning calorimetry, dynamic mechanical analysis, and component extraction and by the determination of material properties. Samples were blended at 350 and 380°F in a roll mill. The...

    Author(s):
    Yanxin Wang; John Simonsen; Carlos Pascoal Neto; Joao Rocha; Timothy G. Rials; Eric Hart
    Year:
    1996
    Keywords:
    Source:
    Journal of Applied Polymer Science 62:501-508

  6. Evaluation of the cure kinetics of the wood/pMDI bondline

    Micro-dielectric analysis (µDEA) and differentia1 scanning calorimetry (DSC) were used to monitor cure of polymeric diphenyl-methane diisocyanate (pMDI) resin with wood strands in a saturated steam environment. A first-order autocatalyzed kinetic model was employed to determine kinetic parameters. The kinetics were found to follow an Arrhenius relation. A single ramp...

    Author(s):
    David P. Harper; Michael P. Wolcott; Timothy G. Rials
    Year:
    2001
    Keywords:
    B. wood, polymeric isocyanate, cure kinetics, dielectric analysis
    Source:
    International Journal of Adhesion and Adhesives 21 (2001) 137-144

  7. Chemical and physical interpretation of MDI cure in saturated steam environments

    The cure of polymeric 4-4? diphenylmethane diisocyanate, PMDl, in wood composite manufacturing has been the subject of much research. The exact contribution of polyurethane, polyurea, and polyurete formation to PMDI/wood bonding is still debated. This study foregoes the mechanism controversy and studies the cure from a panel consolidation process. Micro-dielectric...

    Author(s):
    David Harper; Michael P. Wolcott; Timothy Rials
    Year:
    1999
    Keywords:
    Source:
    Proceedings of the second European panel products Symposium; 1998 October 21-22; Llandudno, Wales, UK.Gwynedd, Wales, UK: 193-204.
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