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The Use of Low Field NMR and Thermal Analysis to the Wood Polymer Composite Study
Author(s) -
Luetkmeyer Leandro,
Tavares Maria Inês Bruno,
Valle Gisele C. X.,
Nogueira José de Souza
Publication year - 2007
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200751212
Subject(s) - thermogravimetric analysis , differential scanning calorimetry , materials science , polystyrene , spin–lattice relaxation , composite number , polymer , composite material , cellulose , relaxation (psychology) , thermal analysis , proton , polymer chemistry , thermal , thermodynamics , chemistry , organic chemistry , psychology , social psychology , physics , quantum mechanics
Summary: The focus of this work was to characterize the molecular dynamic of High Impact Polystyrene (HIPS ‐ 5% PB), wood ‐ A ( Vochysia divergens ) and B ( Erisma uncinatum ) ‐ and their composites, using solid state nuclear magnetic resonance (NMR), by measuring the proton spin‐lattice relaxation time (T 1 H) using a low field NMR, and by thermal analysis as Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA). DSC and TGA measurements show that both woods present the same molecular behavior. On the other hand, the spin‐lattice relaxation time observed that the water is interfering in the packing and arrangements of cellulose chains due to inter and intra hydrogen molecular interactions, promoting the T 1 H values changed to high values. T 1 H shows that the sample B presents a higher rigidity than sample A. However, HIPS presents higher T 1 H values comparing to wood types. Analyzing the relaxation data for the composites, the values indicate that composites present an interaction between both components.