Efficient Utilization of Ozonized Lignin

以工业木质素或其臭氧化产物为原料，加入水溶性环氧化合物、聚乙二醇二缩水甘油醚（PRGDGE）和固化剂，制备了一种新的树脂体系。通过改变共混比或化学结构合成了木质素/环氧树脂。研究了固化树脂膜的粘弹性能，随着树脂中硫酸盐木质素含量的增加，固化树脂的玻璃化转变吸收峰随着铺展而向较高温度移动。研究发现，改变PEGDGE的种类和固化剂的种类，可以改变固化树脂的草化转变。乳液型双酚A二缩水甘油醚（DGEBA）的加入也可提高固化物的玻璃化转变温度。结果表明，该树脂具有良好的相容性，可形成互穿聚合物网络（IPN），并在较低温度下具有较大的二次弛豫峰，因此具有应用于阻尼材料和胶粘剂的可能性。臭氧处理对固化物力学性能的影响不明显。

A new resin system was developed only by mixing the alkaline solution of industrial lignin or its ozonized products with water soluble epoxy compound, polyethylene glycol diglycidyl ether (PRGDGE), and curing reagent. The lignin/epoxy resins were synthesized by alternation the blend ratio or their chemical structure. The viscoelastic properties of cured resin films were investigated.As the content of the kraft lignin in the resins increased, the absorption peak due to the glass transition for cured resins shifted to a higher temperature with spreading. It was found that the grass transition of cured resins can be modified by changing kinds of PEGDGE and curing reagents. Addition of the emulsion type of diglycidyl ether of bisphenol A (DGEBA) to the blendings also could make the grass transition temperature of cured resins higher. Since only one broad dispersion peak due to the grass transition could be observed, it was suggested that the cured resins had compatibility to form a kind of IPNs (Interpenetrating Polymer Networks).The possibility of application of these resins to damping materials and adhesives was strongly suggested, since they had a large secondary relaxation peak at lower temperature. The effect of ozone-treatment on mechanical properties of cured resins was not obvious.