مطالعه ی تیمارهای آمین ممانعت شده و جاذب فرابنفش جهت حفاظت چوب کبوده در برابر هوازدگی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده ی مرمت دانشگاه هنر اصفهان، اصفهان

2 گروه علوم چوب و کاغذ دانشکده منابع طبیعی دانشگاه تهران، کرج

چکیده

تاثیرات فتوشیمیایی ناشی از هوازدگی عامل اصلی تخریب چوب در بسیاری از آثار تاریخی ایران است. از این رو، هوازدگی چوب کبوده(Populus albaL) و تیمار آن با جاذب فرابنفش و امین ممانعت شده در راستای حفاظت آن مورد مطالعه قرار گرفت. نمونه ها به مدت ۳۰۰ و ۸۰۰ ساعت با توجه به استاندارد 99-ASTM2565 حت هوازدگی قرار گرفتند. کاهش جرم نمونه ها محاسبه شد و ارزیابی ها با استفاده از رنگ سنجی، طیف سنجی زیر قرمز- بازتاب کل تضعیف شده تبدیل فوریه و میکروسکوپ الکترونی و باید با این انجام شد. نتایج نشان داد که در نمونه های چوب بدون تیمار، ابتدا لیگنین و سپس درا و این کار را د یده و پس از آن، محصولات تخریب فروشست شده اند. تیمارها تا حد زیادی موجب تند نشر فرایند تخریب شدند ولی تیمار آمین ممانعت شده در مقایسه با جاذب فرابنفش عملکرد بهتری در برابر تخریب فتوشیمیایی داشت و کمتر از سایر نمونه ها دچار تغییرات رنگی گردید.

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