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تاثیر دیاکسید سیلسیوم بر دوام طبیعی و ریختشناسی چندسازه چوب پلاستیک در برابر قارچ رنگینکمان (Trametes Versicolor) | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| مقاله 2، دوره 31، شماره 1 - شماره پیاپی 54، فروردین 1395، صفحه 14-29 اصل مقاله (1.36 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijwpr.2015.105613 | ||
| نویسندگان | ||
| سعید اسمعیلی مقدم* 1؛ افسانه شهرکی2؛ فاطمه دهدست3؛ سمانه پور کرمی4 | ||
| 1باشگاه پژوهشگران جوان و نخبگان، دانشگاه آزاد اسلامی، واحد چالوس، چالوس، ایران. | ||
| 2دانشآموخته کارشناسی ارشد فرآوردههای چندسازه چوب، دانشگاه زابل | ||
| 3دانش آموخته کارشناسی ارشد فرآورده های چندسازه چوب دانشگاه زابل | ||
| 4دانش آموخته کارشناسی ارشد حفاظت و اصلاح چوب دانشگاه علوم کشاورزی و منابع طبیعی گرگان | ||
| چکیده | ||
| این تحقیق با هدف بررسی تأثیر افزودن ذرات سیلیس بر دوام طبیعی و ریختشناسی چندسازه چوب پلاستیک در برابر قارچ رنگینکمان (Trametes Versicolor) انجام شد. آرد چوب با نسبت وزنی 60 درصد با پلیپروپیلن به همراه phc 2 انیدرید مالئیک پلیپروپیلنی مخلوط گردید. نانو و میکرو سیلیس نیز با نسبتهای وزنی 0، 1، 3 و phc 5 بهعنوان پرکننده مورد استفاده قرار گرفتند. فرایند اختلاط در داخل دستگاه مخلوطکن داخلی انجام شد و نمونههای آزمونی با استفاده از دستگاه تزریق ساخته شدند. نمونههای آزمونی به مدتهای 8، 12 و 16 هفته در مجاورت قارچ رنگینکمان با دمای 25 درجه سانتیگراد و رطوبت نسبی 75 درصد مطابق با استاندارد BS 838:1961 قرار گرفتند. سپس کاهش جرم، جذب آب بلندمدت و ضریب انتشار رطوبت بر روی نمونهها انجام شد. برای اطمینان از تشکیل پیوند هیدروژنی بین سیلیس و آرد چوب از طیفسنجی مادون قرمز (FTIR) و برای ریختشناسی چندسازهها از میکروسکوپ الکترونی پویشی (SEM) استفاده گردید. نتایج نشان داد که با افزایش زمان مجاورت نمونهها در محیط قارچ، کاهش جرم، جذب آب بلندمدت و ضریب انتشار رطوبت در چوب پلاستیک افزایش یافت، اما با افزایش سیلیس، از شدت پوسیدگی نمونهها کاسته شد. تأثیر نانو ذرات سیلیس بر دوام طبیعی چندسازه چوب پلاستیک بیشتر از تأثیر میکرو ذرات سیلیس بود. نتایج طیفسنجی مادون قرمز حکایت از ایجاد پیوند هیدروژنی بین آرد چوب و سیلیس داشت. نتایج میکروسکوپ الکترونی پویشی نیز نشان داد که با افزایش مجاورت نمونهها با قارچ ترکهای ریز و درشتی در چندسازه ایجاد گردید اما با افزایش سیلیس از میزان این ترکها کاسته شد. | ||
| کلیدواژهها | ||
| دوام طبیعی؛ ضریب انتشار رطوبت؛ قارچ رنگین کمان؛ نانو و میکرو سیلیس؛ کاهش وزن | ||
| عنوان مقاله [English] | ||
| Effect of silica dioxide on natural resistance and morphological study of wood plastic composite against of white rot fungi (Trametes Versicolor) | ||
| نویسندگان [English] | ||
| Saeid Ismaeilimoghadam1؛ Afsaneh Shahraki2؛ Fatemeh Dehdast3؛ Samaneh Pourkarami4 | ||
| 1Young Researchers and Elite Club, Chalous Branch, Islamic Azad University, Chalous | ||
| 2Graduated of M.Sc., degree of wood composite products, Zabol University, Iran | ||
| 3Graduated of M.Sc., degree of wood composite products, Zabol University, Iran | ||
| 4Graduated of M.Sc., degree of wood protection and modification, University of Agricultural Sciences and Natural Resources of Gorgan, Iran | ||
| چکیده [English] | ||
| The objective of this study was the evaluation of the addition of silica particles in composite on natural resistance and morphology of wood plastic composite against of white rot fungi (Trametes Versicolor). Wood flour at the ratio of 60% (w/w), polypropylene and 2 per hundred compound (phc) MAPP was mixed. Nano and micro silica at 0, 1, 3 and 5 (phc) were added as filler. The mixing process in internal mixer (HAAKE) was done and test specimens were prepared using injection molding. The test specimens were exposed to Trametes Versicolor fungi for 8, 12 and 16 weeks at 25 oC and 75% humidity according to BS 838:1961. Then the mass loss, long-term water absorption and humidity coefficient diffusion of the samples were measured. The formation of hydrogen bonds between silica and wood flour was determined by Fourier Transform Infrared (FTIR) spectroscopy and the morphology of composite was stydied using scanning electron microscopy (SEM). The result showed that with increasing period of samples exposure to fungi, the mass loss, long-term water absorption and humidity coefficient diffusion in wood plastic composite increased. However at higher silica, decay in the samples was decreased. The effect of silica nanoparticles on natural resistance of wood plastic composite was higher than sample containing silica micro particles. Infrared spectroscopy showed hydrogen bonds between wood flour and silica. The result of scanning electron microscopy showed that with increasing of exposure time to fungi, small and large cracks in composite were created. However increasing silica addition, these cracks were decreased. | ||
| کلیدواژهها [English] | ||
| Natural resistance, humidity coefficient diffusion, TRAMETES VERSICOLOR, nano and micro silica, mass loss | ||
| مراجع | ||
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