借助于电子自旋共振波谱仪研究了紫外光、温度、胶粘剂和机械加工对麦秸中自由基的影响。结果表明:反映麦秸自由基特征量的g因子与木材的g因子具有相同的数值。机械加工对木材及麦秸中自由基的影响相似,麦秸被加工越细小,其自由基含量越高,但麦秸的自由基含量要明显低于木材,麦秸形态变化后自由基的比例也明显低于木材。外界温度变化可以影响麦秸的自由基浓度,100℃之前,此影响不显著,10 0℃后,麦秸的自由基浓度明显上升。紫外光的照射对麦秸自由基浓度有影响,随着紫外光照射时间的延长,麦秸中自由基浓度逐渐增加,但增加值不大,并趋于稳定。麦秸中的自由基与胶粘剂之间可以发生作用,麦秸与脲醛树脂胶反应后,其自由基含量略有减小。而麦秸与异氰酸酯反应后,其自由基含量有较大程度的降低。
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.
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