تأثير دي اكسيد تيتانيوم بر روي خواص آنتي باكتريالي و مكانيكي نانو كامپوزيت هاي پلي استايرن

The Effect of Titanium Dioxide on the Antibacterial and Mechanical Properties of Polystyrene Nanocomposites

زﻣﯿﻨﻪ و ﻫﺪف: ﺑﻪ ﺧﺎﻃﺮ ﮐﺎرﺑﺮد ﻓﺮاوان ﭘﻠﯽ اﺳﺘﺎﯾﺮن در ﺻﻨﺎﯾﻊ ﻏﺬاﯾﯽ و ﭘﺰﺷﮑﯽ، داﺷﺘﻦ ﺧﺎﺻﯿﺖ آﻧﺘﯽ ﺑﺎﮐﺘﺮﯾﺎل ﺑﺮاي اﯾﻦ ﻧﻮع از ﭘﻠﯿﻤﺮﻫﺎ داراي اﻫﻤﯿﺖ وﯾﮋه اي ﻣﯽ ﺑﺎﺷﺪ. در اﯾﻦ ﻣﻘﺎﻟﻪ ﻧﻤﻮﻧﻪ ﻫﺎي ﻧﺎﻧﻮ ﮐﺎﻣﭙﻮزﯾﺘﯽ ﭘﻠﯽ اﺳﺘﺎﯾﺮن و دي اﮐﺴﯿﺪ ﺗﯿﺘﺎﻧﯿﻮم ﺑﺎ اﺳﺘﻔﺎده از آﻣﯿﺰه ﮐﺎري ﻣﺬاب در اﮐﺴﺘﺮودر ﺗﻬﯿﻪ ﺷﺪﻧﺪ. روش ﺑﺮرﺳﯽ: ﻧﻤﻮﻧﻪ ﻫﺎي ﻣﻮرد ﻧﻈﺮ ﺑﺮاي ﺗﺴﺖ ﻫﺎي ﻣﮑﺎﻧﯿﮑﯽ و آﻧﺘﯽ ﺑﺎﮐﺘﺮﯾﺎل ﺗﻮﺳﻂ ﻗﺎﻟﺐ ﮔﯿﺮي ﺗﺰرﯾﻘﯽ ﺗﻬﯿﻪ ﺷﺪﻧﺪ. در آزﻣﺎﯾﺶ ﻫﺎ ﻣﺸﺨﺺ ﺷﺪ اﻓﺰودن دي اﮐﺴﯿﺪ ﺗﯿﺘﺎﻧﯿﻮم ﻣﻮﺟﺐ ﺑﻬﺒﻮد در ﺧﻮاص ﻣﮑﺎﻧﯿﮑﯽ و ﺣﺮارﺗﯽ ﭘﻠﯽ اﺳﺘﺎﯾﺮن ﻣﯽ ﺷﻮد. ﯾﺎﻓﺘﻪ ﻫﺎ: در ﻧﺘﺎﯾﺞ آزﻣﻮن ﻫﻮاﺳﻨﺠﯽ ﻃﺒﯿﻌﯽ ﻣﺸﺎﻫﺪه ﺷﺪ ﮐﻪ دي اﮐﺴﯿﺪ ﺗﯿﺘﺎﻧﯿﻮم ﺑﻪ ﻋﻨﻮان ﻓﻮﺗﻮ ﮐﺎﺗﺎﻟﯿﺰور ﻧﯿﻤﻪ ﻫﺎدي ﻧﻘﺶ ﻣﺆﺛﺮي در ﺧﻮاص آﻧﺘﯽ ﺑﺎﮐﺘﺮﯾﺎﻟﯽ ﻣﺎﺗﺮﯾﺲ ﭘﻠﯿﻤﺮي دارد. ﺑﺤﺚ و ﻧﺘﯿﺠﻪ ﮔﯿﺮي: دي اﮐﺴﯿﺪ ﺗﯿﺘﺎﻧﯿﻮم ﺑﺎﻋﺚ ﺑﻬﺒﻮد ﺧﻮاص اﺳﺘﺤﮑﺎم ﺿﺮﺑﻪ، اﺳﺘﺤﮑﺎم ﮐﺸﺸﯽ، دﻣﺎي ﻧﺮم ﺷﺪﮔﯽ وﯾﮑﺎت و ﺷﺎﺧﺺ ﺟﺮﯾﺎن ﻣﺬاب ﺷﺪه اﺳﺖ. ﻫﻤﭽﻨﯿﻦ آﻣﯿﺰه ﻫﺎي ﺗﻬﯿﻪ ﺷﺪه ﺧﺎﺻﯿﺖ آﻧﺘﯽ ﺑﺎﮐﺘﺮﯾﺎل ﻣﻨﺎﺳﺒﯽ در ﺑﺮاﺑﺮ ﺑﺎﮐﺘﺮي ﻫﺎي اﺷﺮﯾﺸﯿﺎ ﮐﻠﯽ و اﺳﺘﺎﻓﯿﻠﻮﮐﻮﮐﻮس آرﺋﻮس از ﺧﻮد ﻧﺸﺎن دادﻧﺪ ﮐﻪ ﻧﻤﻮﻧﻪ ﻧﺎﻧﻮﮐﺎﻣﭙﻮزﯾﺘﯽ ﺑﻪ ﺧﺎﻃﺮ اﻧﺪازه ﮐﻮﭼﮏ ﺗﺮ و ﺳﻄﺢ ﺑﯿﺶ ﺗﺮ ﺧﺎﺻﯿﺖ آﻧﺘﯽ ﺑﺎﮐﺘﺮﯾﺎل ﺑﻬﺘﺮي ﻧﺴﺒﺖ ﺑﻪ ﻧﻤﻮﻧﻪ ﮐﺎﻣﭙﻮزﯾﺘﯽ از ﺧﻮد ﻧﺸﺎن ﻣﯽ دﻫﺪ.

Background and Objective: Due to the high use of polystyrene in food and medicine industries, it is particularly important to have antibacterial properties for these types of polymers. In this study, composite samples of polystyrene and titanium dioxide were prepared by using a twin-screw extruder. Methods: The samples were prepared by injection moulding process for mechanical and anti-bacterial testing. It was observed that adding TiO2 would improve the mechanical and thermal properties of polystyrene. Finding: According to the results of the natural weathering test, TiO2 as a semi-conductor photo-catalyst has an active role in the determination of antibacterial properties of polymer matrix. Results and Discussion: Micro and nano-scale of TiO2 improved impact strength, tensile strength, Vicat softening temperature and melt flow index of all samples. Moreover, the prepared mixture showed appropriate antibacterial properties against E.Coli and S.Aureus. It was concluded that the antibacterial properties of the nanocomposite sample are better than those of the composite sample because of smaller size and larger surface area of Nano particles