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Register a new userLight and Heat Durability of Iraqireed’s Cellulose Fibbers
المتانة الضوئية و الحرارية لألياف سيللوز القصب العراقي الأحمر
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هادي سلمان اللامي( باحث )
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درست قابلية تحمل الألياف السيللوزية المستخلصة من القصب كمادة خام و المستعملة في صناعة الورق للضوء ممثلا بالأشعة فوق البنفسجية و ذلك باستخدام مصدرين لهذه الأشعة، أولهما ذات طول موجي ٢٥٤ نانومترًا و الآخر بطول موجي قدره ٤٠٠ نانومتر. لقد وجد أن لهذه الأشعة تأثيرًا كبيرًا في درجة البلمرة الطبيعية للألياف السيللوزية، و ذلك بواسطة قياس معامل اللزوجة النسبية لمحاليل السيللوز قبل عملية التشعيع و بعدها. و هذا صحيح أيضًا بالنسبة لتأثير الحرارة في الألياف السيللوزية، حيث وجد أنها تتأثر كثيرًا بالحرارة و خاصة بوجود الأكسجين و بمعزل عنه. حيث تزداد قابلية أكسدة السيللوز بوجود الأكسجين. قورنت النتائج السابقة مع سيللوز مستورد و الذي وجد أنه يحتوي على أعلى نسبة من بخار الماء في حين يملك السيللوز غير المقصور العراقي على أعلى نسبة من المواد الطيارة و التي لها علاقة مباشرة بنوعية السيللوز و مصدر استخلاصه.
Influence of light represented by ultraviolet radiation having two different wavelengths, ٢٥٤ nm and ٤٠٠ nm, on some Iraqi cellulose extracted from reeds as a raw material has been studied. It was found that the natural degree of polymerization of cellulose fibers was affected by UV radiation. This was estimated by measuring the relative viscosity of cellulose solution and compared to that of cellulose fibers before treatment. This is also true for the effect of heat on cellulose fibers especially in the presence of oxygen due to the oxidation process. These results were compared with the results obtained for imported cellulose, which was showed that it contains high percent of water vapor, whereas the unbleached cellulose had the higher percent of volatile materials. This reflects the relation between the type of cellulose and it’s sources.
References used
الشاعر, محمود، عبد العزيز, سيد، قنديل, عبد العزيز،"محاصيل الزيوت والسكر والألياف" دار الكتب المصرية، القاهرة ( ١٩٩٣)ز
أمين, عزيز أمين « صناعة السكر وعجينة الورق » دار الحكمة للطباعة والنشر، البصرة ( ١٩٨٦ ).
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