Water Uptake and Mechanical Characteristics of Wood Fiber-Polypropylene Composites

Mechanics of Composite Materials 2006
Armanda Vīksne, A.K. Bledzki, Ligita Rence, Rita Bērziņa

The influence of mixing process (in a two-roll mill, high-speed mixer, or twin-screw extruder) on the strength properties of polypropylene/wood fiber composites was studied. The best results were obtained for composites compounded in a twin-screw extruder. The water uptake and the influence of moisture on the flexural strength (σfl) and modulus (Efl) were studied by immersion of the composites in water at 20, 50, and 90°C. Most strongly the moisture affected the value of Efl, but the degree of water uptake and the change in σfl and Efl also depended on temperature and the presence of a modificator—maleated polypropylene (MAH). MAH improved the strength properties of the composites both in dry and wet states and also decreased the extent of water uptake and swelling in cyclic (soaking/drying) tests.

Atslēgas vārdi
Polypropylene, wood fiber, strength properties, water sorption
DOI
10.1007/s11029-006-0018-3
Hipersaite
http://link.springer.com/article/10.1007/s11029-006-0018-3

Vīksne, A., Bledzki, A., Rence, L., Bērziņa, R. Water Uptake and Mechanical Characteristics of Wood Fiber-Polypropylene Composites. Mechanics of Composite Materials, 2006, Vol.42, Iss.1, 73.-82.lpp. ISSN 0191-5665. e-ISSN 1573-8922. Pieejams: doi:10.1007/s11029-006-0018-3

Publikācijas valoda
English (en)