ﺳﻨﺘﺰ و ﺑﺮرﺳﯽ ﺧﻮاص ﻓﯿﺰﯾﮑﯽ آﺋﺮوژل ﻧﺎﻧﻮﮐﺎﻣﭙﻮزﯾﺖ ﺳﻠﻮﻟﺰ- ﻫﯿﺪروﮐﺴﯿﺪ ﻣﻨﯿﺰﯾﻢ ﺑﻪ ﻣﻨﻈﻮر ﮐﺎرﺑﺮد ﺑﻪ ﻋﻨﻮان ﻋﺎﯾﻖ ﺣﺮارﺗﯽ

آﺋﺮوژل ﺳﻠﻮﻟﺰ ﺑﺪﻟﯿﻞ ﻓﺮاواﻧﯽ ﻣﻨﺎﻓﺬ داﺧﻠﯽ، ﭼﮕﺎﻟﯽ ﭘﺎﯾﯿﻦ، رﺳﺎﻧﺶ ﺣﺮارﺗﯽ ﭘﺎﯾﯿﻦ و اﺳﺘﺤﮑﺎم ﻣﮑﺎﻧﯿﮑﯽ ﺑﺎﻻ ﺑﻌﻨﻮان ﯾﮑﯽ از ﻧﻮﯾﺪﺑﺨﺶﺗﺮﯾﻦ ﻣﻮاد ﻋﺎﯾﻖ ﺣﺮارﺗﯽ زﯾﺴﺖ ﺳﺎزﮔﺎر ﭘﺬﯾﺮ در ﻧﻈﺮﮔﺮﻓﺘﻪ ﺷﺪه اﺳﺖ. ﺑﺎ اﯾﻦ وﺟﻮد، اﯾﻦ آﺋﺮوژل ﺑﻪ آﺳﺎﻧﯽ ﻣﺸﺘﻌﻞ ﻣﯽﺷﻮد ﮐﻪ اﯾﻦ اﻣﺮ اﻣﮑﺎن ﮐﺎرﺑﺮد آن را ﺑﻪ ﻋﻨﻮان ﻣﺼﺎﻟﺢ ﺳﺎﺧﺘﻤﺎﻧﯽ و ﻧﯿﺰ ﻟﻮازم ﺧﺎﻧﮕﯽ ﻏﯿﺮﻣﻤﮑﻦ ﻣﯽﺳﺎزد. ﺑﺮاﯾﻦ اﺳﺎس، در اﯾﻦ ﺗﺤﻘﯿﻖ اﺑﺘﺪا ﻧﺎﻧﻮﺳﻠﻮﻟﺰ ﺑﺎ اﺳﺘﻔﺎده از روزﻧﺎﻣﻪ ﺑﺎﻃﻠﻪ ﺗﻬﯿﻪ ﮔﺮدﯾﺪ و ﺳﭙﺲ ﺑﻪ ﻣﻨﻈﻮر اﺻﻼح ﺑﺎزدارﻧﺪﮔﯽ ﺷﻌﻠﻪ در آن، آﺋﺮوژلﻫﺎي ﻧﺎﻧﻮﮐﺎﻣﭙﻮزﯾﺖ ﺳﻠﻮﻟﺰ - ﻫﯿﺪروﮐﺴﯿﺪ ﻣﻨﯿﺰﯾﻢ ﺳﻨﺘﺰ ﺷﺪﻧﺪ. اﯾﻦ روش زﯾﺴﺖﺳﺎزﮔﺎر ﭘﺬﯾﺮ ﺑﺮاي ﺗﻬﯿﻪ ﻧﺎﻧﻮﮐﺎﻣﭙﻮزﯾﺖﻫﺎي ﺑﺎزدارﻧﺪه ﺷﻌﻠﻪ، ﻧﻪ ﺗﻨﻬﺎ ﻣﻨﺠﺮ ﺑﻪ ﮐﺎﻫﺶ آﻟﻮدﮔﯽ روزﻧﺎﻣﻪ ﺑﺎﻃﻠﻪ ﺑﻠﮑﻪ ﺳﺒﺐ ﺗﺮوﯾﺞ ﮐﺎرﺑﺮد آﻧﻬﺎ در ﻣﻮاد ﻋﺎﯾﻖ ﺣﺮارﺗﯽ ﻧﯿﺰ ﻣﯽﺷﻮد. ﺑﺮاي ﻧﻤﻮﻧﻪﻫﺎي ﻣﻮرد ﻣﻄﺎﻟﻌﻪ، ﻣﺸﺨﺼﻪﯾﺎﺑﯽﻫﺎﯾﯽ از ﻗﺒﯿﻞ اﻟﮕﻮي ﭘﺮاش ﭘﺮﺗﻮ اﯾﮑﺲ، ﻣﻮرﻓﻮﻟﻮژي ﺳﻄﺢ، ﻣﺤﺎﺳﺒﻪ ﭼﮕﺎﻟﯽ و ﻣﯿﺰان ﺗﺨﻠﺨﻞ و ﻧﯿﺰ ﺧﻮاص ﺑﺎزدارﻧﺪﮔﯽ ﺷﻌﻠﻪ ﺻﻮرت ﮔﺮﻓﺖ. ﻣﻘﺎدﯾﺮ ﭼﮕﺎﻟﯽ ﻧﺸﺎن داد ﮐﻪ ﺑﺎ اﻓﺰودن ﻧﺎﻧﻮذرات ﻫﯿﺪروﮐﺴﯿﺪ ﻣﻨﯿﺰﯾﻢ در آﺋﺮوژل ﻧﺎﻧﻮﺳﻠﻮﻟﺰ، ﻣﻘﺪار ﭼﮕﺎﻟﯽ از 0/19 ﺑﻪ 0/29 ﮔﺮم ﺑﺮ ﺳﺎﻧﺘﯽﻣﺘﺮ ﻣﮑﻌﺐ اﻓﺰاﯾﺶ و ﻣﯿﺰان ﺗﺨﻠﺨﻞ ﮐﺎﻫﺸﯽ از 87/3 ﺑﻪ 80/6 درﺻﺪ را داﺷﺘﻪ اﺳﺖ. ﺑﺮرﺳﯽ ﻋﻤﻠﮑﺮد ﺑﺎزدارﻧﺪﮔﯽ ﺷﻌﻠﻪ ﻧﺸﺎن داد ﮐﻪ آﺋﺮوژل ﻧﺎﻧﻮﺳﻠﻮﻟﺰ ﺧﺎﻟﺺ ﺑﻪﺳﺮﻋﺖ ﺑﺎ اﻧﺘﺸﺎر ﺷﻌﻠﻪ، ﻣﺸﺘﻌﻞ ﮔﺮدﯾﺪ. ﺑﺎاﯾﻦﺣﺎل، آﺋﺮوژل ﻧﺎﻧﻮﮐﺎﻣﭙﻮزﯾﺖ ﺣﺎوي ﺑﯿﺸﺘﺮﯾﻦ ﻏﻠﻈﺖ ﻫﯿﺪروﮐﺴﯿﺪ ﻣﻨﯿﺰﯾﻢ ﺧﻮد ﺧﺎﻣﻮشﺷﻮﻧﺪه ﺑﻮد.

Cellulose aerogels is considered as one of the most promising eco-friendly heat insulating materials due to its abundant internal pores, low density, low thermal conductivity and high mechanical strength. However, cellulose aerogel is easy to ignite, which makes it impossible to be used as building materials or domestic appliances. In this regards, in this research first nanocellulose aerogel prepared from waste newspaper and then for the flame retardant modification to it, cellulose /magnesium hydroxide nanocomposite aerogels synthesized. This environmentally friendly method for the preparation of flame retardant nanocomposites not only reduces the waste newspaper pollution but also promotes the application of cellulose aerogels in heat insulating materials. For the studied samples some characterizations such as X-ray diffraction, Surface morphology, density and porosity calculation and the flame retardant properties was carried out. Density values showed that the addition of magnesium hydroxide nanoparticles in the nanocellulose aerogel increased the density from 0.19 to 0.29 grams per cubic and reduced the porosity from 87.3 to 80.6 percent. Investigating the flame retardant performance showed that pure nanocelllose aerogels quickly ignited with flame release. However, the nano-composite aerogel containing the highest magnesium hydroxide concentration was self-extinguishing.