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بررسی اثر تیمار متیل دار کردن بر رفتار نوری لیگنین کرافت از طریق شبیه سازی کاغذهای لیگنین دار | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| مقاله 4، دوره 31، شماره 3 - شماره پیاپی 56، مهر 1395، صفحه 410-424 اصل مقاله (310.53 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijwpr.2016.106279 | ||
| نویسنده | ||
| اصغر تابعی* | ||
| 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 | ||
| لیگنین کرافت؛ متیل دار کردن؛ کهنه سازی نوری؛ شاخص های نوری؛ کاغذهای لیگنین دار | ||
| عنوان مقاله [English] | ||
| Investigating the effect of methylation treatment on the kraft lignin optical behavior through simulation of lignin-containing papers | ||
| نویسندگان [English] | ||
| Asghar Tabei | ||
| Assistant Professor, Department of Wood and Paper Science and Technology, Astara Branch, Islamic Azad University, Astara, Iran | ||
| چکیده [English] | ||
| In this study, changes in optical behavior of Poplar Kraft lignin before and after methylation by using dimethyl sulphate, was monitored by measuring optical indices ( brightness,light absorbtion coefficient, light scattering coefficient,light absorbtion coefficient to light scattering coefficient ratio and Post-Color numbers) of impregnated papers following accelerated photo aging. The structural changes in lignin caused by methylation reaction, were verified by using fourier transform infar red( FT-IR) spectroscopy. The results showed that, by methylation of lignin, it was observed that, in methylated lignin-containing papers, the extent and stability of brightness is more and post- color number is less compared to control samples. In methylated samples, even the strange phenomenon of photo bleaching was observed. Therefore, it was found that, methylation of lignin can prevent the formation of quinone groups and increases the stability of the optical indices in the photo aging conditions. Keywords: Kraft lignin, methylation treatment, accelerated photo- aging, optical indices,lignin-containing papers. | ||
| کلیدواژه‌ها [English] | ||
| Kraft lignin, Methylation reaction, Accelerated photo- aging, optical indices, lignin-containing papers | ||
| مراجع | ||
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