نوع مقاله : مقاله پژوهشی

نویسندگان

1 باشگاه پژوهشگران جوان و نخبگان، دانشگاه آزاد اسلامی، واحد چالوس، چالوس، ایران.

2 دانش‌آموخته کارشناسی ارشد فرآورده‌های چندسازه چوب، دانشگاه زابل

3 دانش آموخته کارشناسی ارشد فرآورده های چندسازه چوب دانشگاه زابل

4 دانش 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

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