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Biobased epoxy nano-composites composed of untreated multi-wall-carbon-nanotubes (MWCNT) and diphenolic acid-derived biobased epoxy: diglycidyl ether of diphenolate n-butyl ester (DGEDP-Bu), were fabricated. Electrical, rheological, and mechanical percolation thresholds were compared between biobased and commercial bisphenol A (DGEBA) epoxy composites. For both epoxies, nanocomposites loaded with...
To improve the Heat Deflection Temperature of polylactide (PLA), nanocomposites were prepared with modified cellulose nanocrystals (CNCs) by melt blending. The preparation of acetate and lactate modified CNCs (AA- and LA-CNCs) was performed by a green one-pot dual acid (organic acid and HCl) method such that acid hydrolysis and Fischer Esterification occur in tandem. The degree of substitution for...
A family of unique aliphatic–aromatic copolyesters was prepared by bulk condensation copolymerizations of bio-derived ω-hydroxytetradecanoic acid (H) with 1,4-butanediol (B) and dimethyl terephthalate (DMT). 1 H NMR analysis showed the copolyesters have random repeat-unit sequence distributions. Thermal properties strongly depend on molar composition. Melting temperatures are lower than 70 °C...
Enzyme-catalyzed degradation of PCL films with embedded Candida antarctica Lipase B (CALB, 1.6%-by-wt) under continuous fluid exchange (flow) conditions and in controlled humidity desiccators were determined. At 0.2 mL/min flow rate, film weight loss reached 85% in 3 d relative to bulk-no flow incubations where 70% degradation occurred in 9 days. This increase in rate under flow conditions is attributed...
A series of poly(ω-pentadecalactone) (PPDL) samples, synthesized by lipase catalysis, were prepared by systematic variation of reaction time and water content. These samples possessed weight-average molecular weights (M w ), determined by multi-angle laser light scattering (MALLS), from 2.5×10 4 to 48.1×10 4 . Cold-drawing tensile tests at room temperature of PPDL samples with...
Poly(lactic acid) (PLA) was melt blended with poly(vinyl acetate) (PVA) using a single-screw extruder. The extruded films obtained were characterized for miscibility, physical properties, degradation and surface morphology. Differential scanning calorimetry showed that all the as-extruded films were amorphous, and that the blends were compatible as only one glass transition temperature was observed...
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