@article {1847, title = { Characterization and 3D printability of poly (lactic acid)/acetylated tannin composites }, journal = { INDUSTRIAL CROPS AND PRODUCTS }, volume = {149}, year = {2020}, abstract = {

In this study, a three-dimensional (3D) printing filament prepared from poly (lactic acid) (PLA) and acetylated tannin via a twin-screw extruder was reported. The impact of acetylated tannin loading content on the final properties of the resulting composite materials and their 3D printability were investigated. The experimental results indicate that PLA can be compounded with up to 20 wt\% acetylated tannin without any obvious deterioration in the tensile property. The resulting composites acquired better degradation rate in aquatic system compared with neat PLA, especially in alkaline medium. Moreover, all composites are printable and showed generally good printing quality with brown color, however, this is limited to temperatures reasonably below 220 degrees C to avoid printing defects, especially at high loadings of acetylated tannin.

}, url = {https://hal.univ-lorraine.fr/LERMAB-UL/hal-02508080}, author = {J.J. LIAO and N. BROSSE and A. PIZZI and S. HOPPE and X.J. ZHOU and G.B. DU} } @article {1850, title = { One-step compatibilization of poly(lactic acid) and tannin via reactive extrusion }, journal = { MATERIALS \& DESIGN }, volume = {191}, year = {2020}, abstract = {

The compatibility issue between poly(lactic acid) (PLA) and tannin is a big challenge for preparing PLA/tannin biocomposites with enhanced properties. In this work, composites with enhanced properties have been accomplished using an efficient one-step reactive extrusion method with the help of methylene diphenyl diisocyanate (p-MDI) or 3-aminopropytriethoxysilane (APS). The extent of compatibility achieved via the one-step was evaluated by tensile, morphological, rheological, and thermal properties. The obtained results indicated that the adhesion promoters, especially p-MDI, contributed efficiently to an improved tensile behavior of the resulting composites with a tough tensile-fracture surface compared with incompatibilized PLA/tannin composite. Moreover, these composites displayed a plateau-like rheological behavior, enhanced complex viscosity, higher melting and thermal degradation temperature. This approach can be potentially adapted to other PLA/biopolymers composite systems.

}, url = {https://hal.inria.fr/hal-02495239/}, author = {J.J. LIAO and N. BROSSE and S. HOPPE and G. DU and X.J. ZHOU and A. PIZZI} } @article {1842, title = { Dynamically Cross-Linked Tannin as a Reinforcement of Polypropylene and UV Protection Properties }, journal = {POLYMERS}, volume = {11}, year = {2019}, abstract = {

Tannins were used as reinforcing components for polypropylene with anti-UV properties via dynamic curing extrusion. The influence of cross-linked tannins in different weight fraction and their anti-UV capacity on morphological, mechanical, rheological, crystallize and thermal properties were studied. The experimental results indicated that the cross-linked tannins improve Young\&$\#$39;s modulus, crystallinity, and thermal stability and reinforce the internal network of polypropylene. After UV accelerated weathering, polypropylene had fewer surface cracks, lower carbonyl index, fewer crystallinity decreases and less mechanical properties loss with increasing tannin content.

}, url = {https://hal.archives-ouvertes.fr/hal-01977584}, author = {J.J. LIAO and N. BROSSE and A. PIZZI and S. HOPPE} } @article {1808, title = { Glutaraldehyde-wheat gluten protein adhesives for wood bonding }, journal = { JOURNAL OF ADHESION }, year = {2019}, abstract = {

Wheat gluten protein hydrolysate was used as a biomass feedstock to prepare environmentally friendly protein-based adhesives, with hydrolyzed wheat protein as control. Glutaraldehyde was used to modify it to obtain a glutaraldehyde-wheat protein (GP) adhesive. Polyethylenimine (PEI) was also used as a crosslinking agent. Plywood has been prepared and tested, and its performance was used to measure the wheat gluten protein hydrolysate adhesive bonding performance. Differential scanning calorimetry (DSC) and thermomechanical analysis (TMA) were used to analyze the adhesive thermal properties and the microstructures of the cured adhesives by scanning electron microscopy (SEM). The results show that modification by glutaraldehyde can effectively improve the bonding performance of wheat protein adhesives, the plywood bonded strength having been improved by its addition. The effect of PEI as a crosslinking agent became evident. It can greatly improve the bonding properties of glutaraldehyde-modified wheat protein adhesives. TMA analysis indicates that the glutaraldehyde-modified GP adhesive has a higher storage modulus than the unmodified one. The modulus of the adhesive increased after adding the PEI cross-linking agent.

}, author = {X.D. XI and A. PIZZI and C. GERARDIN and J.J. LIAO and S. AMIROU and S. ABDALLA} } @article {1805, title = { Polypropylene Blend with Polyphenols through Dynamic Vulcanization: Mechanical, Rheological, Crystalline, Thermal, and UV Protective Property }, journal = {POLYMERS}, volume = {11}, year = {2019}, abstract = {

Tannin and lignin were blended with polypropylene (PP) through dynamic vulcanization technique. Their influence of mechanical property, crystallinity, thermal stability, as well as ultraviolet (UV) protection property on the PP matrix was investigated and compared with native tannin and lignin. According to our experimental results, tannin and lignin undergo dynamic vulcanization and were more compatible with the PP matrix. Besides, tannin and vulcanized tannin can perform as nucleating agents of PP because of their relatively small particle size. Moreover, vulcanized tannin/lignin have a better performance on the thermal stability of PP compared with native tannin/lignin, especially PP/vulcanized lignin blend. Furthermore, vulcanized tannin/lignin present better UV protective performance, concluded from fewer changes on surface morphology, carbonyl index, crystallinity, viscosity, and tensile property.

}, url = {https://hal.univ-lorraine.fr/LERMAB-UL/hal-02196798}, author = {J.J. LIAO and N. BROSSE and A. PIZZI and S. HOPPE and X.D. XI and X.J. ZHOU} }