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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 | ||
|
-Adelstein, P. Z., Zinn, E. D. and Reilly, J. M., 2003. Effect of atmospheric pollution on paper stability. Pulp Pap. Sci journal, 29(1), 21-28. -Beaton, C. R. and Argyropoulos, D. S., 2001. Photostabilizing milled wood lignin with benzotriazoles and hindered nitroxide. Photobiol Journal, 73(6): 605 – 610. -Chang, H. T., Su, C. Y. and Chang, S. T., 2006. Studies on photostability of butyrylated, milled wood lignin using spectroscopic analysis. Polymer Degradation and Stability Journal, 91(4): 816 - 822. -Darabi, P., 2010. The effect of methylation and anti-oxidant on discoloration of weathered wood plastic composites. Iranian Journal of Wood and Paper Science Research, 1(1): 13-26. (In Persian). -Francis, R. C., Dence, C. W., Alexander, T. C., Agnemo, R. and Omori, S., 1991. Photostabilization of thermomechanical pulps by alkylation and borohydride reduction. Tappi Journal, 74 (12): 127-133. -Gierer, J. and Lin, S. Y., 1972. Photodegradation of lignin. A contribution to the mechanism of chromophore formation. Svensk Papperstidn. 75 (7): 233-239. -George, B., Suttie, E. Merlin, A. and Deglise, X., 2005. Photodegradation and photostabilisation of wood- the state of the art. Polymer Degradation and Stability Journal, 88(2): 268 - 274. -Heikkurinen, A., Leskela, L., Heinemann, S. and Vehniainen, A., 2009. The character and properties of mechanical pulps. 456-514. In: B. Lonnberg (Ed.). Mechanical pulping. Peper Engineers, Association/ Paper ja Puu Oy, Helsinky, Finland. -Heinter, C., 1993. Light-induced yellowing of wood-containing papers- an evolution of the mechanism. In: Heinter, C. and Scaiano, J. C., (Eds.). Photochemistry of lignocellulosic materials. ACS Symposium series 531. American Chemical Society, Washington, DC. -Hu, T. Q. and James, B. R., 2000. Towards inhibition of yellowing of mechanical pulps. Part IV: Photostability of hydrogenation of lignin model compounds. Pulp & Paper science Journal, 26, 173-175. -Johanson, M., 2000. Formation of chromophores and leucochromophores during manufacturing of mechanical pulp. Licentiate Thesis, Royal Institute of Technology, Department of Pulp and Paper Chemistry and Technology, Devision of Wood Chemistry. 30p. -Kringstad, K. P. and Lin, S. Y., 1970. Mechanisms in the yellowing of high yield pulps by light: structure and reactivity of free radical intermediates in the photodegradation of lignin. Tappi 53, 2296. -Landquist, K., 1992. Lignin isolation methods. 64-70 [Chapter 2]. In: Lin, S.Y. and Dence, C.W., (Eds.). Methods in lignin chemistry. New York: Springer – Verlage. -Leary, G. J., 1968. The yellowing of wood by light. Part 2. Tappi journal. 51, 257. -Mirshokraie, S. A., 2003. Wood chemistry: Fundamentals and applications. Ayij Press, 198p. (translated in Persian). -Mirshokraie, S. A., 2003. Pulp and paper terminology. Ayij Press, 420p. (translated in Persian). -Mirshokraie, S. A., 2011. Investigating the effect of structural changes of alkali lignins caused by reduction and methylation reaction on the optical characteristics of lignin-containing papers. Iranian Journal of wood and Paper Science Research, 26 (1): 10-25 (In Persian). -Mirshokraie, S. A., Abdulkhani, A., Enayati, A. A. and Jahan Latibari, A., 2005. Evaluation of mechanical and optical properties of modified baggas chemi-mechanical pulp through acetylation in liquid phase. Iranian Polymer Journal, 14(11), 982 - 988. -Mohammad Ibrahim, M. N., Chuah, S. B. and Wan Rosli, W. D., 2004. Characterization of lignin precipitated from the soda black liquor of oil palm empty fruit bunch fibers by various mineral acids. Asian Journal on Science and Technology for Development, 21 (1): 57-67. -Nemati, M. and Hemmasi, A. H., 2008. Investigating the photo aging effect of some ions of transition elements on the properties of chemi-mechanical papers ( The impact on the Post-Color number). Journal of Agricultural Sciences, 13 (3): 707-723 (In Persian). -Owen, N.L. and Thomas, D.W., 1989. Infrared studies of "hard" and "soft" woods. Application of spectroscopy, 43 (2), 451 – 455. -Paulsson, M. ,Ragauskas, J.A., 1998. Chemical modification of lignin-rich paper. Part 9. Effect of dry heat and moist heat on accelerated yellowing of untreated and acetylated pulp. Nord. Pulp Pap. Res. J. 13 (2), 191-197 -Paulsson, M. ,Ragauskas, J.A., 2000. Chemical modification of lignin-rich paper, American Chemical Society, 490 - 505. -Paulsson, M. and Simonson, R., 2002. Acetylation of lignin and photostabilization of lignin-rich mechanical wood pulp and paper. 221-244. In: Thomas, Q. and Hu, K., (Eds.). Chemical Modification, Properties, and Usage of Lignin. Academic, Plenum Publishers. -Paulsson, M. Parkas, J., 2012. Review: Light-induced yellowing of lignocellulosic pulps- Mechanism and preventive methods. Bioresources Journal, 7(4), 5995-6040. -Pu,Y., Anderson, S., Lucia, L. and Ragauskas, J.A., 2003, Photobehaviours of Acetylated Softwood BCTMP Lignin. Journal of Pulp And Paper Science, 29 (12): 401- 406. Schmidt, J. A. and Heinter, C., 1991. . Ligh-induced yellowing of mechanical and ultra-high yield pulps. Part 1. Effect of methylation, NaBH4 reduction and ascorbic acid on chromophore formation. Wood Chemistry and Technology Journal, 11(4), 397-418. -Schmidt, J. A. and Heinter, C., 1993. Ligh-induced yellowing of mechanical and ultra-high yield pulps. Part 2. Radical- induced cleavage of etherified guaiacylglycerol-β-arylether groups is the main degradative pathway. Wood Chemistry and Technology Journal, 13: 309-325. -Schwanninger, M., Rodrigues, J.C., Pereira, H. and Hinterstoisser, B., 2004. Effects of short – time vibratory ball milling on the shape of FTIR spectra of wood and cellulose. Vibrational Spectroscopy, 36: 23 – 40. -Sen, S., Patil, S. and Argyropoulos D. S., 2015. Methylation of softwood kraft lihninwith dimethyl carbonate. Green Chemistry Journal, 2(17): 1077-1087. -Sun, R., Tomkinson, J., Sun, X.F. and Wang, N.J., 2000. Fractional isolation and physico-chemical characterization of alkali-soluble lignins from fast-growing poplar wood. Polymer Journal , 41 (23): 8409-8417. -Tabei, A., Mirshokraie, A., Talaiepoor, M., Khademi Eslam, H. and Hemmasi, A. H., 2008. Investigating the optical behavior of Kraft and Dioxan lignin of Poplar (Populus alba) and their acetylated derivative. Journal of Agricultural Sciences, 13 (3): 777-795 (In Persian). -Yoon, B. H., Wang, L. J. and Kim, G. S., 1999. Formation of lignin-metal complexes by photo-irradiation and their effect on colour reversion of TMP. Journal of Pulp and Paper Science, 25 (8): 289-293. | ||
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