The present work shows the behavior of non-treated and chemical pre-treated peach palm fibers, as reinforcement polymer composites. Chemical treatments with H 2 O 2, NaOH, and C 3 H 3 N and their effects on adhesion performance of the fiber with unsaturated polyester resin are carried out. SEM is used to determine a time exposition of the fibers to chemical reagent and thermal characterization of these fibers after set time is performed. A hand lay-up method is applied to develop the composites and they are tested for tensile strength and Izod impact strength. The TGA of the fibers pre-treated with H 2 O 2 20 V for 144 h show better thermal stability when compared with non-treated fiber. Other treatments do not improve their thermal properties.
Fibers from agricultural residues originating from harvesting heart-of-palm, a renewable resource, have been explored to produce composites with low cost and sustainability, from widely available raw materials. This work investigated the influence of fiber mat percentage and UV-accelerated aging on the properties of polyurethane (PU) matrix composites. The highlight is on the dissociation process of extracting the fibrils from peach palm leaves and producing a fiber mat. The hemicelluloses, cellulose, and lignin contents were determined before and after the dissociation. The mats were incorporated into the matrix by the hand lay-up method corresponding to 6 or 10 wt%. The composites were subjected to accelerated weathering for 90 days and then were characterized by TGA, SEM and tensile testing. The main results indicated that the thermal stability of the composites remained similar to that of neat PU, and the UV-weathering effect on mechanical properties was evident after 90 days of exposure.
Problems of pronunciation and meaning are very numerous in contemporary linguistic studies which have been studied for their history since the time of the classical Arabs. The problem of pronunciation and meaning in terms of art and technique has been tried to be analyzed. The same sentence can have different meanings due to differences in pronunciation intonation, context, situations and conditions of speech. A word continues to develop according to the development of human thought and needs and gives rise to new meanings. The problem of dilalah can be seen in terms of musytarak, taddad and taraduf.
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