نوع مقاله : مقاله پژوهشی
نویسنده
استادیار، گروه علوم و صنایع چوب و کاغذ، دانشگاه آزاد اسلامی، واحد آستارا
چکیده
در این تحقیق تغییرات رفتار نوری لیگنین کرافت صنوبر(Populus alba)، پیش و پس از متیل دار کردن با دی متیل سولفات با استفاده از فنون اندازه گیری تغییرات شاخص های نوری ( روشنی، K، S، K/S و عدد تغییر رنگ ) کاغذ آغشته به لیگنین بر اثر کهنه سازی نوری تسریع شده، مورد مطالعه قرار گرفت. تغییرات ساختاری ایجاد شده در لیگنین بر اثر تیمار متیل دار کردن، با استفاده از طیف سنجی FT-IR پیگیری و تا حد ممکن تعیین شد. نتایج حاصله نشان داد که با انجام تیمار متیل دار کردن لیگنین، در کاغذهای آغشته به لیگنین متیل دار شده در مقایسه با نوع متیل دار نشده ی آن، میزان روشنی افزایش یافت و عدد تغییر رنگ کوچک تر شد. در طول زمان پرتودهی نیز، در کاغذهای آغشته به لیگنین متیل دار شده مقاومت در برابر واکنش های تحریک نوری بیشتر شد بطوریکه، حتی در آنها پدیده ی شگفت انگیز رنگ بری نوری نیز اتفاق افتاد. بنابراین مشخص شد که متیل دار شدن، با ممانعت از تشکیل ساختارهای کینونی در لیگنین، بر ثبات شاخص های نوری کاغذهای لیگنین دار در شرایط کهنه سازی نوری می افزاید.
کلیدواژه‌ها
موضوعات
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