ﺗﺄ ﺛﯿﺮ ﻣﻮاد اﺳﺘﺨﺮاﺟﯽ ﭼﻮب درون ﺳﻨﺠﺪ روي ﺧﻮاص ﺣﺮارﺗﯽ

Effect of Heartwood Extractives of Elaeagnus Angustifolia L. on the Thermal Properties

ﺑﻪﻣﻨﻈﻮر ﺑﺮرﺳﯽ ﺗﺄﺛﯿﺮ ﻣﻮاد اﺳﺘﺨﺮاﺟﯽ ﭼﻮب ﺑﺮ ﺧﻮاص ﺣﺮارﺗﯽ، ﭼﻮب ﺳﻨﺠﺪ از ﻣﻨﻄﻘﻪ ﺟﻨﻮب ﺷﻬﺮ ﻫﻤﺪان ﺗﻬﯿﻪ ﮔﺮدﯾﺪ. ﺑﺨﺶ ﭼﻮب درون ﺑﻪ ﭘﻮدر ﭼﻮب ﺗﺒﺪﯾﻞ ﺷﺪ. اﺳﺘﺨﺮاج از ﭘﻮدر ﭼﻮب ﺑﻪ روش ﺳﻮﮐﺴﻮﻟﻪ ﺑﺎ اﺳﺘﻔﺎده از ﺣﻼل اﺗﺎﻧﻮل- ﺗﻮﻟﻮﺋﻦ و ﻣﻄﺎﺑﻖ ﺑﺎ اﺳﺘﺎﻧﺪارد ASTM : D 1107-96روش 76- T 204 OSاﻧﺠﺎم ﺷﺪ. ﭘﻮدرﻫﺎي ﭼﻮب اﺳﺘﺨﺮاجﺷﺪه و اﺳﺘﺨﺮاجﻧﺸﺪه ﺑﻪوﺳﯿﻠﻪ دﺳﺘﮕﺎه آﻧﺎﻟﯿﺰ ﺣﺮارﺗﯽ آزﻣﺎﯾﺶ ﺷﺪﻧﺪ. ﻧﺘﺎﯾﺞ ﻧﻤﻮدارﻫﺎي آﻧﺎﻟﯿﺰ ﮔﺮﻣﺎﺳﻨﺠﯽ وزﻧﯽ (TGA)، ﻣﺸﺘﻖ ﮔﺮﻣﺎﺳﻨﺠﯽ وزﻧﯽ ) (DTGو آﻧﺎﻟﯿﺰ ﺣﺮارﺗﯽ ﺗﻔﺎﺿﻠﯽ DTA)( ﺣﺎﺻﻞ ﻧﺸﺎن ﻣﯽدﻫﺪ ﻣﻮاد اﺳﺘﺨﺮاﺟﯽ در اﯾﻦ ﭼﻮب ﺑﺎﻋﺚ ﺷﺪه اﻧﺪ ﮐﺎﻫﺶ وزن ﻧﺎﺷﯽ از ﺗﺨﺮﯾﺐ در ﺣﺮارتﻫﺎي ﺑﺎﻻﺗﺮ ﺻﻮرت ﮔﯿﺮد. ﻣﻮاد اﺳﺘﺨﺮاﺟﯽ، ﺳﺮﻋﺖ ﺗﺨﺮﯾﺐ در اﺛﺮ ﺗﺠﺰﯾﻪ ﺣﺮارﺗﯽ را ﮐﺎﻫﺶ داده اﻧﺪ و ﺣﻀﻮر ﻣﻮاد اﺳﺘﺨﺮاﺟﯽ در ﭼﻮب ﺑﺎﻋﺚ ﺷﺪه اﻧﺮژي ﺣﺮارﺗﯽ ﺑﯿﺸﺘﺮي آزاد ﺷﻮد ﮐﻪ ﻧﺎﺷﯽ از ﺳﻮﺧﺘﻦ اﯾﻦ ﻣﻮاد ﻣﯽﺑﺎﺷﺪ. ﻧﺘﺎﯾﺞ اﯾﻦ ﭘﮋوﻫﺶ ﻧﺸﺎن داد ﻣﻮاد اﺳﺘﺨﺮاﺟﯽ در اﯾﻦ ﭼﻮب، ﻣﻘﺎوﻣﺖ ﺣﺮارﺗﯽ را اﻓﺰاﯾﺶ ﻣﯽدﻫﻨﺪ.

To investigate the effect of wood extractives on thermal properties, wood of Elaeagnus angustifolia L. species was provided from the southern region of Hamadan. The Heartwood part was turned into wood powder. Extraction of wood powder have been with Soxhlet method using ethanol-toluene solvents and in accordance with ASTM: D 1107-96 standard, T 204 OS-76 method. The extracted and unextracted wood powders, were examined by Thermal analysis device. The obtained graphs of Thermogravimetric analysis (TGA), Derivative of Thermogravimetric analysis (DTG) and Differential Thermal analysis (DTA) showed the wood extractives were the cause of occurred the weight loss due to degradation at higher temperature. Wood extractives have reduce on the degradation rate of thermal decomposition. The presence of extractives in wood caused greater thermal energy release due to the burning of these materials. The findings of this study demonstrated that the extractive materials in this wood increased thermal resistance.