γ射线辐照对竹纤维素分子量及分子量分布的影响

Effect of γ-ray radiation on the molecular weight and its distribution of bamboo cellulose

采用60Coγ射线对造纸级竹纤维素浆粕进行辐照处理,用粘度法及凝胶渗透色谱法表征了辐照处理后竹纤维素的分子量及分子量分布的变化规律,并推出其辐射裂解的G(s)值为0.94μmol?J-1。结果表明,竹纤维素是较易辐射裂解的聚合物,竹纤维素的平均聚合度(或相对分子量)是吸收剂量的函数,随着吸收剂量的增加,竹纤维素分子量降低,分子量分布变窄。

Bamboo cellulose pulp was irradiated in air by ^60Co γ-rays. Effects of γ-ray irradiation on the molecular weight and its distribution of bamboo cellulose were investigated by viscosimetry and gel permeation chromatography. The G（s） value was estimated at 0.94μmol·J^-1. The results showed that molecular weight of irradiated bamboo cellulose decreased and the molecular weight distribution narrowed with increasing dose.