Plasticizers depress the glass transition temperature (T_g) of polymers and produce a flowable material at lower temperatures. The use of plasticizers to depress T_g of lignin is important, since at high processing temperatures lignin crosslinks, making it intractable. The goal of this study was to assess plasticizers and polymer blends for the ability to retard a commercial softwood kraft lignin from crosslinking and also serve as thermal and rheological property modifiers during thermal processing in the attempt to produced moldable and spinnable lignin for lignin and carbon fiber products. The T_g of the lignin and the lignin mixed with various amounts of plasticizers and with different thermo-mechanical mixing were determined using differential scanning calorimetry. The T_g and the change in heat capacity at the glass transition (ΔC_p) decreased and increased, respectively, about linearly within this plasticizers range with increased plasticizer weight percentage. Gel permeation chromatography results for extruded lignin as well as extruded lignin-plasticizer blends with glycerol, N-allyurea, citric acid with and without sodium hypophosphite, and oleic acid indicate that the presence of these materials reduced the rate of molecular weight increase at temperatures between 100 and 200 °C. Continuous, homogenous films and fibers could be produced by thermal processing with plasticized lignin samples and plasticized lignin-polymer blends, but not with lignin alone. These fibers could be carbonized, yielding up to about 50% of carbon. The present findings have shown the advantages of plasticizers in thermally processing a commercial softwood kraft lignin.

增塑剂可降低聚合物的玻璃化转变温度（T _g），并在较低温度下产生可流动的材料。使用增塑剂抑制木质素的T _g很重要，因为在较高的加工温度下木质素会发生交联，因此很难处理。这项研究的目的是评估增塑剂和聚合物共混物的能力，以阻止商业软木硫酸盐木质素交联，并在热处理过程中还用作热和流变性能改良剂，以尝试生产可成型和可纺的木质素和碳纤维木质素。产品。第t_克使用差示扫描量热法测定木质素和木质素与各种数量的增塑剂和不同的热机械混合的混合比。第t_克，并在玻璃化转变的热容的变化（ΔC _p）在增塑剂重量百分比增加的情况下，分别在此增塑剂范围内呈线性下降和增加。挤出的木质素以及挤出的木质素-增塑剂与甘油，N-烯脲，柠檬酸（含或不含次磷酸钠）和油酸的共混物的凝胶渗透色谱分析结果表明，这些物质的存在降低了温度在550℃至260℃之间分子量的增加100和200°C。可以通过用增塑的木质素样品和增塑的木质素-聚合物共混物进行热处理来生产连续的均质薄膜和纤维，但不能单独使用木质素。这些纤维可以碳化，最多可产生约50％的碳。本发现表明增塑剂在热处理商业软木牛皮纸木质素中的优势。