ارتقاء ویژگی‌های پوشش‌های نانو الیاف سلولزی با استفاده از آمونیوم ‌زیرکونیوم‌کربنات و سوربیتول

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم و صنایع چوب و کاغذ، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران.

2 گروه سلولزی و بسته‌بندی، پژوهشکدة شیمی و پتروشیمی، پژوهشگاه استاندارد، کرج، ایران.

10.22059/jfwp.2024.377436.1298

چکیده

این پژوهش با هدف بررسی و بهبود خواص پوشش­های نانوالیاف سلولزی با استفاده از آمونیوم ‌زیرکونیوم‌کربنات و سوربیتول انجام شد. بدین‌منظور، فرمولاسیون­ های مختلف از نانوالیاف سلولز، آمونیوم ‌زیرکونیوم‌کربنات به‌عنوان عامل اتصال­دهندة عرضی و سوربیتول به‌عنوان عامل نرم‌کننده ساخته شدند و از آنها برای پوشش ­دهی کاغذ بسته ­بندی استفاده شد. سپس خواص مقاومتی و ممانعتی کاغذهای پوشش ­دهی شده نظیر نفوذپذیری نسبت به هوا (گرلی)، سرعت عبور بخار آب (WVTR) و سرعت انتقال گاز اکسیژن (OTR) اندازه‌گیری شد. نتایج نشان داد که پوشش ­دهی با نانو الیاف سلولز و آمونیوم­ زیرکونیوم­ کربنات موجب بهبود خواص ممانعتی کاغذ می­ شود، به‌طوری‌که در اثر پوشش کاغذ با نانوالیاف سلولز عمل­ آوری شده با اتصال‌دهندة آمونیوم ­زیر­کونیوم­ کربنات، مقاومت در برابر عبور هوا شدیداً افزایش و میزان جذب رطوبت، سرعت انتقال گاز اکسیژن و سرعت عبور بخار آب کاهش یافت. این موضوع به انسداد خلل و فرج سطح کاغذ با ایجاد یک لایة یکپارچه، وجود مقدار زیاد پیوندهای هیدروژنی، افزایش گروه ­های آبگریز حاصل از واکنش­ گروه­ های هیدروکسیل نانوالیاف سلولز با آمونیوم زیرکونیوم ­کربنات و مسیرهای پیچشی، غیرمستقیم و طولانی ­تر عبور مولکول­ های آب و اکسیژن نسبت داده شد. علاوه بر این، نتایج بررسی سطوح شکست نمونه­ ها با میکروسکوپ الکترونی روبشی گسیل میدانی (FE-SEM) نشان‌دهندة تشکیل ساختاری لایه ­ای و یکپارچه­ بر سطح کاغذ پایه و توزیع یکنواخت ماتریس نانوالیاف سلولز عمل­ آوری شده با اتصال‌دهندة آمونیوم ­زیر­کونیوم­ کربنات در لایة پوشش بود. نتایج همچنین نشان داد که خواص مکانیکی نمونه­ ها در اثر پوشش‌دهی افزایش یافت، به ­طوری‌که نمونة پوشش­ دهی شده با نانوالیاف سلولز عمل­ آوری شده با اتصال‌دهندة آمونیوم­ زیر­کونیوم­ کربنات (15 درصد) و سوربیتول (100 درصد) بیشترین استحکام کششی را به‌خود اختصاص داد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Enhancement of the properties of cellulose nanofiber coatings using ammonium zirconium carbonate and sorbitol

نویسندگان [English]

  • Saeedeh Heshmati 1
  • Mohammad Azadfallah 1
  • Mehdi Roohani 2
  • Seyedeh Sedigheh Ebrahimi 1
1 Department of Wood and Paper Sciences and Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran.
2 Assistant Prof., Research Group of Cellulosic Materials and Packaging, Research Department of Chemistry and Petrochemistry, Standard Research Institute, Iran
چکیده [English]

This research was conducted with the aim of investigating and improving the properties of cellulose nanofiber coatings using ammonium zirconium carbonate and sorbitol. For this purpose, packaging films were prepared based on different formulations of cellulose nanofibers, ammonium zirconium carbonate as a cross-linking agent, and sorbitol as a softening agent, and applied as coatings on packaging paper. The barrier properties and mechanical strength of both coated and uncoated paper were measured and analyzed. The results showed that papers coated with cellulose nanofibers and ammonium zirconium carbonate exhibited proper and uniform coatings. The barrier properties of the coated papers, such as air permeability (Gurley), water vapor permeability (WVP), and oxygen transmission rate (OTR), were measured. The results demonstrated that coating the paper with the cellulose nanofiber and ammonium zirconium carbonate matrix improved the barrier properties, significantly increasing the air resistance of the paper and reducing moisture absorption, oxygen transmission rate, and water vapor permeability. The fracture surfaces of the samples were examined using a field emission scanning electron microscope (FE-SEM), revealing a uniform coating layer on the base paper and an even distribution of the cellulose nanofiber matrix along with the ammonium zirconium carbonate binder in the coating layer. The mechanical properties of the samples were evaluated through a static tensile test, which showed that the mechanical properties improved due to the coating. The sample coated with a mixture of cellulose nanofibers, 15% ammonium zirconium carbonate binder, and 100% sorbitol exhibited the highest results.

کلیدواژه‌ها [English]

  • Air permeability
  • Barrier properties
  • Mechanical properties
  • Oxygen transmission rate
  • Water vapor permeability

مراجع

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نشریه جنگل و فرآورده های چوب
دوره 77، شماره 2
شهریور 1403
صفحه 187-200

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