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1. Comparison between polyethylene glycol and tributyl citrate to modify the properties of wood fiber/polylactic acid biocomposites

Author

Bi Yongbao, Denis Rodrigue, Min Xu, Xinhao Feng, Bi Hongjie, and Zhaozhe Yang

Subjects
Materials science, Polymers and Plastics, 02 engineering and technology, General Chemistry, Polyethylene glycol, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, chemistry, Chemical engineering, Polylactic acid, Materials Chemistry, Ceramics and Composites, Tributyl citrate, Fiber, Composite material, 0210 nano-technology
Published
2018
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3. Bleached extruder chemi-mechanical pulp fiber-PLA composites: Comparison of mechanical, thermal, and rheological properties with those of wood flour-PLA bio-composites

Author

Bi Yongbao, Jinquan Yue, Zhaozhe Yang, Zhifang Zhou, Xinhao Feng, and Min Xu

Subjects
Materials science, Polymers and Plastics, 02 engineering and technology, engineering.material, 010402 general chemistry, 01 natural sciences, Crystallinity, chemistry.chemical_compound, Differential scanning calorimetry, stomatognathic system, Flexural strength, Ultimate tensile strength, Materials Chemistry, Hemicellulose, Composite material, Pulp (paper), technology, industry, and agriculture, Wood flour, General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, stomatognathic diseases, chemistry, engineering, Biocomposite, 0210 nano-technology
Abstract

An environmentally friendly bleached extruder chemi-mechanical pulp fiber or wood flour was melt compounded with poly(lactic acid) (PLA) into a biocomposite and hot compression molded. The mechanical, thermal, and rheological properties were determined. The chemical composition, scanning electron microscopy, and Fourier transform infrared spectroscopy results showed that the hemicellulose in the pulp fiber raw material was almost completely removed after the pulp treatment. The mechanical tests indicated that the pulp fiber increased the tensile and flexural moduli and decreased the tensile, flexural, and impact strengths of the biocomposites. However, pulp fiber strongly reinforced the PLA matrix because the mechanical properties of pulp fiber-PLA composites (especially the tensile and flexural strengths) were better than those of wood flour-PLA composites. Differential scanning calorimetry analysis confirmed that both pulp fiber and wood flour accelerated the cold crystallization rate and increased the degree of crystallinity of PLA, and that this effect was greater with 40% pulp fiber. The addition of pulp fiber and wood flour modified the rheological behavior because the composite viscosity increased in the presence of fibers and decreased as the test frequency increased. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44241.

Published
2016
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4. Comparison between polyethylene glycol and tributyl citrate to modify the properties of wood fiber/polylactic acid biocomposites.

Author

Yang, Zhaozhe, Bi, Hongjie, Bi, Yongbao, Rodrigue, Denis, Xu, Min, and Feng, Xinhao

Subjects
POLYETHYLENE glycol, POLYLACTIC acid, BIODEGRADABLE plastics, POLYESTERS, POLYMERS
Abstract

In this work, polyethylene glycol (PEG) and tributyl citrate (TBC) are proposed to modify the properties of wood fiber (WF, 20 wt%)‐reinforced polylactide (PLA, 80 wt%) biocomposites. The reinforcing and toughening effects of these additives were systematically investigated by comparing their mechanical, thermal and rheological properties. It was found that 5 wt% TBC improved the compatibility between WF and PLA and resulted in increased tensile strength (15%) and thermal stability (4%) of the biocomposites compared with those of unmodified biocomposites. The glass transition temperature, melting temperature, and crystallinity of TBC‐modified biocomposites were lower than those of PEG biocomposites. In addition, the storage modulus, loss modulus and complex viscosity of TBC‐modified biocomposites were effectively improved at low TBC content (5–10 wt%), whereas reduced properties were obtained when the same PEG content was added. As wettability is always a problem in biocomposites, the contact angle was not changed with TBC content (up to 20 wt%), and a linear decrease was observed with a PEG content up to 30 wt%. POLYM. COMPOS., 40:1384–1394, 2019. © 2018 Society of Plastics Engineers [ABSTRACT FROM AUTHOR]

Published
2019
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