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بررسی تأثیر استیلاسیون چوب راش بر مقاومت چسبندگی سطحی شفافپوشهها (سیلر،کیلر و نیم پلیاستر) | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| مقاله 10، دوره 31، شماره 1 - شماره پیاپی 54، فروردین 1395، صفحه 105-117 اصل مقاله (1.06 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijwpr.2015.102671 | ||
| نویسندگان | ||
| شهرام طهماسبی1؛ بهزاد بازیار* 2؛ حبیبالله خادمی اسلام3؛ محمد غفرانی4 | ||
| 1کارشناس ارشد، گروه صنایع چوب و کاغذ، دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران | ||
| 2استادیار گروه صنایع چوب و کاغذ، دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران | ||
| 3دانشیار گروه صنایع چوب و کاغذ، دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران | ||
| 4دانشیار گروه صنایع چوب، دانشکده عمران، دانشگاه تربیت دبیر شهید رجائی تهران | ||
| چکیده | ||
| در این تحقیق تأثیر استیلاسیون چوب راش بر کاهش میزان چسبندگی سطحی رنگهای شفاف سیلر- کیلر و نیم پلیاستر مورد بررسی قرار گرفت. برای این منظور تختههایی از چوب راش (Orientalis Fagus) با رطوبت نسبی 12 درصد و ابعاد 12 ×110 ×110 میلیمتر در سطوح مماسی و شعاعی تهیه و توسط استیک انیدرید در دو سطح 5/12 و 5/15 درصد تیمار شدند، سپس طی دو فرایند جداگانه توسط رنگهای شفاف سیلر-کیلر و سیلر-نیمپلیاستر پوشش داده شدند. برای بررسی تأثیر فرایند استیلاسیون بر ساختار چوب تیمار شده از طیف FT-IR استفاده شد. نتایج این آزمون که توسط نرمافزار SPSS (6 تکرار برای هر نمونه) مورد تجزیهوتحلیل آماری قرار گرفت، نشان داد که میزان کاهش چسبندگی در سطح شعاعی چوب راش بیشتر از سطح مماسی آن است. البته در میان نمونههای تیمار شده، بیشترین کاهش چسبندگی مربوط به نمونههای استیله با شدت استیلاسیون 5/15 درصد میباشد و کمترین میزان کاهش چسبندگی در نمونههای کنترل ملاحظه شد. نتایج همچنین نشان داد که استفاده از پوشش رنگ سیلر- نیم پلیاستر در مقایسه با پوشش رنگ سیلر- کیلر دارای مقاومت چسبندگی بالاتری است. | ||
| کلیدواژهها | ||
| استیله؛ سیلر و کیلر؛ نیم پلیاستر؛ راش؛ مقاومت چسبندگی | ||
| عنوان مقاله [English] | ||
| Studying the effect of acetylation Beech on interfacial bonding resistance of transparent paint (nitrocellulose lacquer, asid catalyzed lacquer and Half Ppolyester) | ||
| نویسندگان [English] | ||
| shahram tahmasebi1؛ behzad bazyar2؛ habibolah Khademi Islam3؛ mohammad Ghofrani4 | ||
| 1M.Sc., Department of Wood and Paper Science and Technology, Science and Research Branch of Islamic Azad University, Tehran, Iran | ||
| 2Assistant Professor, Department of Wood and Paper Industry, Science and Research Branch of Islamic Azad University | ||
| 3Associate Professor, Department of Wood and Paper Industry, Science and Research Branch of Islamic Azad University | ||
| 4Associate Professor of Wood Industry, Department of Civil Engineering, Shaid Rajaei Teacher Training University | ||
| چکیده [English] | ||
| In this study, structural performance of corner joint reinforced by fiber reinforced polymers (FRP) at the area of maximum tension stress was investigated under diagonal tension loading. Therefore 1 to 3 layers of unidirectional woven Glass, Carbon and Kevlar fibers were used and hand lay-up was done by vinyl ester and epoxy resins. Results of load-displacement curve at yield point exhibited capability of the reinforcing layers in preventing joint opening to some extent under load. However, failure was observed at the joint due to picking fibers from wood surface or members fracture near the interface when loading increased. Since the reinforced zones of the joints by FRP show the maximum shear stress, consequently the separation of fibers from wood surfaces increased at these locations. The adhesion of FRP layers to joint surface was not appropriate due to difficult process of layering at right angle of joints followed by probable formation of air bubbles. The results of assessing FRPs reinforcing behaviour indicated that application of vinyl ester in comparison with epoxy as matrix exhibited better performance. In addition, glass and carbon fibers showed better performance than Kevlar fibers as reinforcing agents. | ||
| کلیدواژهها [English] | ||
| Acetylation, nitrocellulose lacquer, asid catalyzed lacquer and Half Ppolyester, beech, bond resistance | ||
| مراجع | ||
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