TESTE DE SPECTROSCOPIE IN INFRAROSU APROPIAT PENTRU LEMNUL TRATAT TERMIC

Katsuya MITSUI
Dr. - Gifu Prefectural Human Life Technology Research Institute
Adresa: 1554 Yamada, Takayama 506-0058, Japan
E-mail: mitsui@wood.rd.pref.gifu.jp

Tetsuya INAGAKI
Nagoya University, Graduate School of Bioagricultural Science
Adresa: Furo-cho, Chikusa Nagoya 464-8601, Japan
E-mail: tetsuyaina@hotmail.com

Satoru TSUCHIKAWA
Prof.Dr. - Nagoya University, Graduate School of Bioagricultural Science
Adresa: Furo-cho, Chikusa Nagoya 464-8601, Japan
E-mail: st3842@nuagr1.agr.nagoya-u.ac.jp

Rezumat:
Aceasta lucrare prezinta evaluarea prin spectroscopie in infrarosu apropiat (NIR) a lemnului tratat termic. O valoare maxima (varf) a lungimii de unda de 6913 cm-1, neraportata inca, a putut fi obtinuta in cadrul spectrului secundar derivat NIR, odata cu procesul de tratare termica. S-a confirmat ceea ce s-a presupus referitor la gruparile hidroxil fenolice din lignina, deoarece lemnul acetilat nu are un maxim la 6913 cm-1 in cadrul spectrului derivat secundar. Mai mult, spectrul NIR in zona gruparilor hidroxil (7200 - 6100 cm-1) a fost separat prin metoda Gauss - Newton si s-au comentat variatiile mediei in zona de varf dupa tratamentul termic si cele inainte de tratare. Ca o consecinta, s-a confirmat ca gruparile hidroxil din celuloza s-au degradat in ordinea urmatoare: cele din regiunea amorfa, cele din regiunea semicristalina, urmate de cele din regiunea cristalina.

Cuvinte cheie:
grupari hidroxil, spectroscopie in infrarosu apropiat (NIR), tratament termic.

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