تأثیر صمغ کتیرای قلیایی‌شده بر خواص نوری و مکانیکی اسناد کاغذی تاریخی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری مرمت اشیای تاریخی و فرهنگی، دانشگاه هنر تهران، ایران

2 استادیار و عضو هیئت‌علمی، دانشکده مرمت، دانشگاه هنر اصفهان، ایران

چکیده

هدف این پژوهش، ارزیابی صمغ کتیرا، بهینه‌سازی و استفاده از آن به‌عنوان استحکام بخش جهت بازگرداندن مقاومت‌های استحکام و پایداری به اسناد کاغذی تاریخی می‌باشد. در این پژوهش محلول کتیرا با درصدهای وزنی مختلف تهیه شد و جهت بالابردن میزان pH، کلسیم هیدروکسید و جهت افزایش انعطاف پذیری، گلیسرول به آن افزوده شد. تیمار حاصل روی نمونههای کاغذی سه بار بوسیله اسپری دستی به میزان 5/3 میلی‌لیتر اسپری شده و سپس تحت کهنه‌سازی رطوبت- دما به شماره استاندارد 4706- ISIRI به مدت 12 روز کامل و کهنه‌سازی نور به شماره استاندارد ASTM D6789-02 به مدت 6 روز کامل قرار داده شد. نتایج نشان داد که pH نمونههای تیمارشده قبل و بعد از کهنه‌سازی نسبت به نمونه شاهد، به میزان 75/0 تا 2/2 واحد افزایش یافته و در محدوده قلیایی قرار گرفته است. آنالیز SEM، پیوستگی سطحی بیشتر الیاف را گزارش داد. ارزیابی مقاومت کششی نمونه‌ها قبل و بعد از کهنه‌سازی بیان کنندة افزایش مقاومت تا 15% بسته به میزان صمغ مصرفی بود. نتیجه آنالیز رنگ سنجی، قدرمطلق تغییرات رنگی نمونههای تیمارشده و نمونه شاهد را قبل و بعد از کهنه‌سازی 145/0 و 372/0 گزارش داده و عدم تغییرات رنگ و کدورت ماده استحکام بخش را اعلام نموده است.

کلیدواژه‌ها

موضوعات


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