الفهرس 
LITERATURE REVIEWOnly 14 pages are availabe for public view
 |  | from | 253 |  |  |
| | | from | 253 | | |
Abstract
The studied properties included dimensional stability properties:
water absorption (WA2.24), volumetric swelling coefficient (S2,24), antishrink
efficiency (ASE2.24) after 2 and 24 hours water soak as well as
static bending properties: modulus of rupture (MOR) and modulus of
elasticity (MOE), shear stress parallel to grain (Ss) and abrasion resistance
(Ar)’
The results of this study showed significant difference between the
behavior of the treated specimens compared with the untreated control
specimens. The analysis of the results points to an appropriate value of
concentration to achieve the maximum retention levels of impregnation
media reaching 25% with MF, LS, PFw and Pest>while attaining only 15%
with other polymers.
Most of the treatments showed recognized influence on
dimensional stability. For example, the treatment with MF has resulted
into a decrease of volumetric swelling coefficient from 20.2% to 1.5%
and from 71.6% to 9.6% after 2 and 24 hours water submersion test
respectively.as compared to the control and water absorption decrease by
weight from 37.2% to 4.9% and from 165.1% to 32.6% after 2 and 24
hours water submersion test respectively as compared to the control.
The impregnation by PS, Pest. LS, and PFa increased the MOR
values by up to 35% for both Pest and PS, 30% and 23% for aIcoholsoluble
phenol formaldehyde’ and linseed oil respectively. The MOE
values increased by up to 45% for PS, 35% for polyester and 33% for
alcohol-soluble phenol formaldehyde.
The treatment with LS, MMA, Pc~t and MF inc.eased the abrasion
resistance by up to 61 (Yu Ior methyl mcthucrylutc, 43% for linseed oil,
~]% lor polyester and 17% 1’01 melamine formaldehyde, while 110
treatment improved the shear strength of the DPLM.
Thus, select ive treatments could be chosen, for the improvement physical and mechanical properties 01 0PLM, .iased on the needed
application and end use.