Water uptake and mechanical characteristics of wood fiber-polypropylene composites

被引：16
|
作者：
Viksne, A. [1 ]
Bledzki, A. K. [1 ]
Rence, L. [1 ]
Berzina, R. [1 ]
机构：
[1] Riga Tech Univ, Inst Polymer Mech, LV-1048 Riga, Latvia
来源：
MECHANICS OF COMPOSITE MATERIALS | 2006年 / 42卷 / 01期
关键词：
polypropylene; woodfiber; strength properties; water sorption;
D O I：
10.1007/s11029-006-0018-3
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The influence of mixing process (in a two-roll mill, high-speed mixer, or twin-screw extruder) oil 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 (sigma(fl)) and modulus (E-fl) were studied by immersion of the composites in water at 20, 50, and 90 degrees C. Most strongly the moisture affected the value of E-fl, but the degree of water uptake and the change in sigma(fl) and E-fl 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.
引用
收藏
页码：73 / 82
页数：10
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