Material utilization and functionalization of lignosulfonic acid via microcompositions with synthetic polymers

由于分离木质素的分子量和分子结构较低，其成膜性差，模塑性不足，限制了其作为固体材料的利用。在本研究中，我们制备了(1)以聚n -乙烯基吡咯烷酮（PVP）为相容剂，以乙酸纤维素（CA）为载体的无糖磺酸（LSA）复合材料和(2)LSA/聚乙烯醇（PVA）复合水凝胶。对于复合材料(1)，LSA通过与PVP的乙烯基吡咯烷酮单元的氢键有效地结合到复合材料中。利用Freundlich和Langmuir模型评价了复合材料对尼古丁的吸附性能，结果表明LSA与尼古丁之间存在较强的相互作用。另一方面，对于(2)的方法，通过热处理或与戊二醛反应引入交联部分。通过热交联，通过在LSA和PVA之间形成氢键和磺酸酯，可以防止LSA在水介质中的洗脱，这两者都通过FT-IR测量得到证实。经热处理的复合水凝胶在生理盐水溶液中表现出尼古丁的缓释行为。另一方面，为了提高在水介质中化学交联制备的LSA/PVA复合水凝胶的LSA含量，采用聚乙二醇二缩水甘油酯醚作为交联剂对LSA进行预交联。因此，链接lsa的加入大大提高了复合水凝胶的保水性，其中蒸馏水的最大保水性为其自重的500倍。

Utilization of isolated lignins as a solid material is constrained by poor film formability and insufficient moldability due to their low molecular weight and molecular structure. In the present study, we prepared (1) ignosulfonic acid (LSA)-containing composites with cellulose acetate (CA) via poly(N-vinyl pyrrolidone) (PVP) as a compatibilzier and (2) LSA/poly(vinyl alcohol) (PVA) composite hydrogels. For the composite (1), LSA was effectively incorporated into the composites via hydrogen bonding with vinylpyrrolidone unit of PVP. Adsorption property of the composites to catch nicotine was evaluated with Freundlich and Langmuir models, which revealed the occurrence of a strong interaction between LSA and nicotine. On the other hand, for the approach of (2), cross-linking moiety was introduced by thermal treatment or reaction with glutaraldehyde. By thermal cross-linking, an elution of LSA in aqueous media could be prevented by formations of hydrogen bonding and sulfonate ester between LSA and PVA, both of which were corroborated by FT-IR measurement. The thermal-treated composite hydrogels demonstrated a sustained-release behavior of nicotine in normal saline solution. On the other hand, pre-interlinking of LSA was performed using poly(ethylene glycol) diglycidyl ether as a linking agent, in order to improve the LSA content for the LSA/PVA composite hydrogel prepared via chemical cross-linking in aqueous media. Thereupon, the incorporation of linked-LSA achieved much improvement of water retentivity for the composite hydrogels, where the maximum retentivity of distilled water was > 500 times its own weight.