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تغییر در ساختار شیمیایی و آبگریزکردن چوب پالونیا با رزین فلوئوروکربن | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| مقاله 43، دوره 35، شماره 2 - شماره پیاپی 71، مرداد 1399، صفحه 178-194 اصل مقاله (898.35 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijwpr.2020.341853.1601 | ||
| نویسندگان | ||
| آیسونا طلائی1؛ محمد هادی رضوانی* 2؛ حسینعلی رجبی چم حیدری3 | ||
| 1استادیار، گروه علوم و تکنولوژی صنایع چوب، دانشکده مهندسی مواد و فناوریهای نوین، دانشگاه تربیت دبیر شهید رجائی، تهران، ایران | ||
| 2گروه علوم و تکنولوژی صنایع چوب، دانشکده مهندسی مواد و فناوری های نوین، دانشگاه تربیت دبیر شهید رجایی، تهران | ||
| 3گروه علوم و تکنولوژی صنایع چوب، دانشکده مهندسی مواد و فناوری های نوین، دانشگاه تربیت دبیر شهید رجایی تهران | ||
| چکیده | ||
| کاربرد گسترده چوبهای اصلاح شیمیایی/گرماییشده در مصارف بیرونی و محیطهای با رطوبت نسبی و دمای بالا، اهمیت استفاده از مونومرهای فوق آبگریز را دوچندان نموده است. در بررسی اثر اصلاح با فلوئوروکربن بهعنوان اتصالدهنده بر ویژگیهای فیزیکی و ساختار شیمیایی چوب پالونیا، تیمارگرمایی در دو سطح دمایی 150 و 160 درجه سانتیگراد و اصلاح شیمیایی با فلوئوروکربن در دو سطح 15 و 25 درصد انجام شد. اصلاح شیمیایی/گرمایی سبب میشود که مونومر و سپس گرما بهصورت یکنواخت به داخل چوب منتقل شود و با ایجاد تغییر شیمیایی در ساختار چوب، آبدوستی آن را کم کند. برای اندازهگیری آزمونها، نمونهها به گروههای شاهد، شاهد گرمایی و فلوئوروکربن گرمایی تقسیمبندی شدند. تیمار فلوئوروکربن گرمایی سبب اصلاح گروههای هیدروکسیل و آبگریزی نمونهها شد. طیفسنجی مادون قرمز حضور فلوئوروکربن و پیوند با بسپارهای چوب را تأیید کرد. واکنشدهی فلوئوروکربن به تغییر ساختار شیمیایی، افزایش وزن و حجیمشدگی نمونهها انجامید. میزان جذب آب و واکشیدگی حجمی نمونههای فلوئوروکربن گرمایی در مقایسه با نمونههای شاهد و شاهدگرمایی کمتر بود. بهبود در کارایی آبگریزی و اثر ضد واکشیدگی نمونههای فلوئوروکربن گرمایی نسبت به شاهد گرمایی، ثبات ابعاد را افزایش داد و پوششی فوق آبگریز و مقاوم به آبشویی روی دیوارهها و داخل حفرههای سلول چوب ایجاد نمود که علت این امر به نفوذ بیشتر فلوئوروکربن و کاهش تخلخل چوب نسبت دادهشد. | ||
| کلیدواژهها | ||
| اصلاح شیمیایی؛ فلوئوروکربن؛ کارایی آبگریزی؛ ساختار شیمیایی | ||
| عنوان مقاله [English] | ||
| Changes in Chemical Structure and Hydrophobization of the Paulownia Wood with Fluorocarbon Resin | ||
| نویسندگان [English] | ||
| Aisona Talaei1؛ Mohammad Hadi Rezvani2؛ Hosseinali Rajabi Cham Heidari3 | ||
| 1Department, Faculty of Materials Engineering and New Technologies, shahid Rajaee Teacher Training University, Tehran, Iran | ||
| 2Wood Science and Technology Department, Faculty of Materials Engineering and New Technologies, Shahid Rajaee Teacher Training University, Tehran, Iran | ||
| 3Wood Science and Technology Department, Faculty of Materials Engineering and New Technologies, Shahid Rajaee Teacher Training University, Tehran, Iran | ||
| چکیده [English] | ||
| The widespread use of chemically/thermally modified wood in outdoor applications and in environments with high relative humidity and high temperature has doubled the importance of using hydrophobic monomers. To evaluate the effect of fluorocarbon modification as a binder on the physical properties and chemical structure of paulownia wood, thermal modification was performed at two temperature levels of 150 and 160°C and chemical modification with fluorocarbon at two levels of 15 and 25%. Chemical/thermal modification causes the fluorocarbon monomer and heat to be uniformly transferred into the wood and to reduce its hydrophilicity by causing chemical changes in the wood structure. Specimens were divided into control, thermal and thermal fluorocarbon treatment groups. The thermal fluorocarbon treatment caused modification of the hydroxyl groups and hydrophobicity in specimens. Infrared spectroscopy confirmed the presence of fluorocarbons and bonding with wood polymers. The fluorocarbon reaction resulted in chemical changes, weight gain and bulking of the specimens. The water uptake and volumetric swelling of the heat-treated fluorocarbon specimens were lower than the control and heat-treated ones. Improvement of water repellency efficiency and anti-swelling efficiency of thermal fluorocarbon specimens increased the dimensional stability compared to the thermal control and created a super hydrophobic and leak-resistant coating on the cell walls and inside the lumens. It was attributed to the greater penetration of fluorocarbons and the reduction of wood porosity. | ||
| کلیدواژهها [English] | ||
| Chemical Modification, Fluorocarbon, Water Repellency Efficiency, Chemical Structure | ||
| مراجع | ||
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