Abstract:

In this paper it is researched that ultraviolet radiation, temperature, adhesive and processing have effect on wheat straw by the spectrum instrument of Electron Spin Resonance. The result of test shows that there is a same value of g-factor for wood and wheat straw. The processing has a similar effect on free radial of wood and wheat straw. The smaller wheat straw is processed, the higher it has free radial. The content of free radial for wheat straw is much lower than wood. The increase proportion is also much lower than wood after the change of wheat straw shape. The change from outer temperature can influence the content of free radial for wheat straw. The effect is not notability before 100 degree centigrade. The content of free radial for wheat straw increase clearly after 100 degree centigrade. The irradiation of ultraviolet radiation has effect on the free radial in wheat straw. The free radial content of wheat straw increases gradually along with prolonging the time from irradiation of ultraviolet radiation, but the value of increase is not big and goes stabilization. The action can take place between free radial for wheat straw and adhesive. The free radial content of wheat straw has a smaller decrease after the reaction between wheat straw and UF. However, the free radial content of wheat straw has a bigger decrease after the reaction between wheat straw and MDI.

Key words: Wheat straw, Free-radial, Electron spin resonance