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中文摘要：
采用沉淀法将乙酸木质素在乙酸水溶液中分成具有不同相对分子质量的3个级分。3个级分经苯酚酚化后,得到3种酚化木质素,其酚羟基含量明显提高。3种酚化产物与环氧氯丙烷反应得到3种木质素基环氧树脂。由最低相对分子质量的酚化木质素制备的环氧树脂环氧值最高为1.69 mmol/g,初始热分解温度最高达到256.3℃,残炭率最低41.6%。木质素基环氧树脂与E-44环氧树脂共混固化后,可以较大程度地提高E-44环氧树脂的黏接剪切强度。由相对分子质量最低的酚化木质素制备的环氧树脂,与E-44环氧树脂共混固化后黏接剪切强度最高达到7.9 MPa。
英文摘要：
Acetic acid lignin（AAL） was fractionated into three fractions with different relative molecular mass at different concentration of acetic acid-water solution.These three fractions further reacted with phenol and yielded the corresponding phenolized lignins（PL）.PL showed higher phenolic hydroxyl than that of AAL.Three kinds of lignin-based epoxy resins（PLEP） were prepared from PL by reacting with epichlorohydrin.PLEP showed the highest epoxy value（1.69 mmol/g）,thermal degradation temperature（256.3 ℃）,and the lowest char yield（41.6 %） using PL with the lowest relative molecular weight.It was found that the adhesive shear strength of the cured blends of PLEP and E-44 epoxy resin was improved compared with E-44 epoxy resin.For example,the cured blend of E-44 epoxy resin and PLEP prepared from PL with the lowest relative molecular mass showed high adhesive shear strength（7.9 MPa）.
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