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اثر اصلاح گرمایی بر ساختار شیمیایی و فیزیکی راش ایرانی (Fagus Orientals) و افرا پلت (Acer Velutinum) | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| مقاله 71، دوره 33، شماره 1 - شماره پیاپی 62، فروردین 1397، صفحه 142-154 اصل مقاله (521.63 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijwpr.2018.116213.1445 | ||
| نویسندگان | ||
| فروغ دستوریان* 1؛ فائزه فرهادی2؛ فهیمه حسین زاده2؛ سید مجید ذبیح زاده3 | ||
| 1استادیار، دانشگاه علوم کشاورزی و منابع طبیعی ساری، گروه مهندسی چوب و فرآوردههای سلولزی، ساری، مازندران، ایران | ||
| 2دانشآموخته کارشناسی ارشد، دانشگاه علوم کشاورزی و منابع طبیعی ساری، گروه مهندسی چوب و فرآوردههای سلولزی | ||
| 3دانشیار، گروه صنایع چوب و کاغذ، دانشگاه علوم کشاورزی و منابع طبیعی ساری | ||
| چکیده | ||
| تحقیق حاضر با هدف بررسی اثر اصلاح گرمایی بر ساختار شیمیایی و خواص فیزیکی چوب راش ایران و افرا پلت انجام شد. نتایج طیفسنجی زیر قرمز نشان داد که اصلاح گرمایی موجب کاهش گروههای هیدروکسیل گردید و این اثر با افزایش دما تا 175 درجه سانتیگراد محسوستر شد. اصلاح در دمای 190 درجه سانتیگراد به افزایش گروههای هیدروکسیل نسبت به نمونه شاهد منتهی شد. افزایش بلورینگی سلولز، کاهش همیسلولز، افزایش نسبت لیگنین، تخریب لیگنین سیرینجیل و افزایش واکنشهای تراکمی لیگنین نیز از طیفسنجی منتج گردید. نتایج آزمون جذب آب نشان داد که اصلاح حراتی جذب آب نمونههای چوب را کاهش داد. میزان کارآیی آبگریزی برای دو چوب راش و افرا نشان داد که اصلاح گرمایی در دمای 160 درجه سانتیگراد بهبود قابل توجهی در آبگریزی و پایداری ابعاد ایجاد نکرد، ولی اصلاح در دمای 190 درجه سانتیگراد به کاهش مقابل ملاحظه جذب آب به ویژه در چوب راش انجامید. اثر اصلاح گرمایی بر کارآیی ضدواکشیدگی چوب راش بیشتر از افرا بودهاست، که بر اساس کاهش وزن بیشتر چوب راش متعاقب اصلاح گرمایی، این امر دور از انتظار نبودهاست. | ||
| کلیدواژهها | ||
| اصلاح گرمایی؛ جذب آب؛ واکشیدگی؛ طیف زیر قرمز تبدیل فوریه | ||
| عنوان مقاله [English] | ||
| Effect of thermal modification on chemical and physical properties of Iranian Beech (Fagus orientalis) and Velvet Maple (Acer Velutinum) | ||
| نویسندگان [English] | ||
| Foroogh Dastoorian1؛ Faezeh Farhadi2؛ Fahimeh Hoseinzadeh2؛ majid zabihzadeh3 | ||
| 1Assistant Professor, Sari Agricultural Sciences and Natural Resources University, Dep. Of Wood & Cellulosic Products Engineering, Sari, Mazandaran, Iran | ||
| 2M.Sc., Graduated, Sari agricultural Sciences and Natural Resources University, Dep. Of Wood & Cellulosic Products | ||
| 3Associate Professor, Sari Agricultural Sciences and Natural Resources University, Dep. Of Wood & Cellulosic Products Engineering | ||
| چکیده [English] | ||
| The present study was done with the aim of investigation of the effect of heat treatment on chemical and physical properties of Iranian beech and Velvet maple. Results of spectroscopy showed that heat treatment led to decrease of hydroxyl groups which became more sensible with increasing temperature up to 175oC. Treatment at 190oC led to an increase of hydroxyl group comparing to the control ones. Increasing cellulose crystallinity, decreasing the hemicellulose content, increasing the lignin ratio, degradation of syringyl lignin and increase the condensation reaction of lignin was also obtained from spectroscopy. Results of water absorption tests also showed that heat treatment caused decreasing of water absorption. The water repellent and anti-swelling efficiency for both species showed that heat treatment at 160oC didn’t improve the water repellency and dimensional stability however treatment at 190oC led to decrease of water absorbance specially in beech. In total, the effect of heat treatment on anti-swelling efficiency in beech was more considerable comparing to acer, which can be explained by higher weight loss after heat treatment. | ||
| کلیدواژهها [English] | ||
| heat treatment, water absorption, swelling, Fourier-transform infrared spectroscopy | ||
| مراجع | ||
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