ارزیابی تأثیر سفیدکننده‌های اکسیدکننده بر ویژگی‌های ظاهری و ساختاری کاغذ

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده حفاظت و مرمت، دانشگاه هنر اصفهان، اصفهان، ایران، صندوق‌پستی : 1744

2 گروه شیمی پژوهشگاه نیرو، تهران، ایران، صندوق‌پستی: 14665517

چکیده

کاغذ در گذر زمان زرد می‌شود. سفیدگری با اکسید کننده‌ها از معمول‌ترین روش‌ها است و با شکست ساختار کروموفورهای جاذب نور در کاغذ، سبب بی‌رنگ شدن آنها می‌شود. در این تحقیق، تغییرات ایجاد شده در خصوصیات کاغذ در صورت استفاده از اکسید کننده‌ها مطالعه شده است. نمونه‌های کاغذ با آزمون‌های رنگ‌سنجی، طیف‌سنجی زیر قرمز، آزمون کشش، آزمون اسیدی بودن و میکروسکوپ SEM تعیین مشخصه شده‌اند. در این تحقیق، چهار محلول اکسید‌کننده: پراکسید هیدروژن (2 درصد حجمی/ حجمی)، پراکسید سدیم (2 درصد وزنی/ حجمی)، پریدات پتاسیم (2 درصد وزنی/ حجمی) و پرسولفات پتاسیم (2 درصد وزنی/ حجمی) در آب مقطر برای سفیدگری نمونه‌های کاغذ صافی واتمن به شیوه غوطه‌وری استفاده شده است. نمونه‌ها به مدت 48 ساعت اصلاح و آزمون‌های تعیین مشخصه انجام شد. نتایج نشان داد پراکسید هیدروژن، با بالاترین شاخص مقاومت کششی (Nm/g 17.75) و پایین‌ترین اختلاف رنگ (1.48=E) پس از کهنه‌سازی تسریع شده، بهترین عملکرد را در بین سایر نمونه‌ها دارد و سبب بهبود مقاومت کششی، افزایش روشنایی و کاهش زردی، ثبات الیاف و همچنین نگهداری کاغذ در یک محیط اسیدی تقریباً خنثی شده است.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of the Effect of Oxidizing Bleaches on the Visual and Structural Properties of Paper

نویسندگان [English]

  • M. Khajeh-mahmoudi 1
  • M. Azadi Boyaghchi 1
  • M. Mohammadi Achachluei 1
  • M. Ghahraman Afshar 2
1 Faculty of Conservation and Restoration, Art University of Isfahan, P.O. Box: 1744, Isfahan, Iran
2 Power Research Institute, P. O. Box: 14665517, Tehran, Iran
چکیده [English]

Paper turns yellow over time. Bleaching with oxidizing agents is one of the most common methods, which creates a colorless result by breaking down the light-absorbing chromophores. In this research, the changes in the properties of paper by applying oxidizing agents are studied. The paper samples were characterized by colorimetric, infrared spectroscopy, tensile, acidity, and SEM microscopes. Four oxidizing solutions were deployed for whitening the samples of Whatman paper using the Immersion method, including Hydrogen Peroxide (2 % V/V), Sodium Peroxide (2 % W/V), Potassium Periodate (2 % W/V), and Potassium Persulphate (2 % W/V) all solved in distilled water. The samples were treated within 48 hours, and characterizing tests were deployed. The results show that hydrogen peroxide with the highest tensile strength (17.75 Nm/g) and the lowest color difference (E= 1.48) after accelerated aging has the best performance among other samples. Also, hydrogen peroxide can be improved tensile strength, increase brightness, reduce yellowing, cause fibers stability, and keep the paper at an almost neutral acidity.

کلیدواژه‌ها [English]

  • Yellowing
  • Bleaching
  • Oxidizing agents
  • Oxidation
  • Paper
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