THE EFFECT OF LONG-TERM TREATMENT AT 100-DEGREES-C-150-DEGREES-C ON STRUCTURE, CHEMICAL-COMPOSITION AND COMPRESSION BEHAVIOR OF CORK

被引:38
|
作者
ROSA, ME [1 ]
PEREIRA, H [1 ]
机构
[1] INST SUPER AGRON, DEPT ENGN FLORESTAL, P-1399 LISBON, PORTUGAL
关键词
CORK; CELLULAR MATERIALS; MECHANICAL PROPERTIES; CHEMICAL COMPOSITION; THERMAL BEHAVIOR;
D O I
10.1515/hfsg.1994.48.3.226
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
The effects of heating of cork in air at 100-degrees-C and 150-degrees-C for up to 42 days have been studied. Dimensional and mass changes induced by heat treatment were measured and the chemical composition was analysed. The thermal degradation of cork is small for short periods of treatment but increases with time and temperature. Cork looses after 42 days of treatment 6.8 % of its mass at 100-degrees-C and 19.9 % at 150-degrees-C. Cork extractives and polysaccharides were found to be the most temperature labile components. The cellular structure, observed by scanning electron microscopy, did not change with treatment in these conditions. Compression curves of untreated and heat treated cork samples were obtained, which show an increase of compression strength upon heating for short exposure periods and a decrease for longer ones. The changes observed in the compression behaviour of cork treated at 100-degrees-C and 150-degrees-C were related to the chemical composition changes induced by heat treatment.
引用
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页码:226 / 232
页数:7
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