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Lignin Functionalized with Succinic Anhydride as Building Block for Biobased Thermosetting Polyester Coatings
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-01-12 00:00:00 , DOI: 10.1021/acssuschemeng.7b03583 Carmela Scarica 1 , Raffaella Suriano 1 , Marinella Levi 1 , Stefano Turri 1 , Gianmarco Griffini 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-01-12 00:00:00 , DOI: 10.1021/acssuschemeng.7b03583 Carmela Scarica 1 , Raffaella Suriano 1 , Marinella Levi 1 , Stefano Turri 1 , Gianmarco Griffini 1
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Novel lignin-based thermosetting polyester (PE) coating systems are presented in this work. These new materials are based on the functionalization of a soluble fraction of softwood kraft lignin recovered from solvent extraction with increasing amounts of succinic anhydride (SAn), to obtain SAn/lignin adducts via the formation of ester bonds on the hydroxyl groups in lignin. A thorough chemical, physical, and thermal characterization of the resulting esterified materials was conducted to confirm the successful covalent incorporation of SAn in the lignin macromolecule. Such functionalized SAn/lignin adducts were employed as building blocks for the preparation of cross-linked lignin-based PE coatings under different curing conditions. These PE coatings highlighted improved thermal stability, film forming ability, solvent resistance, dynamic surface hardness, and higher hydrophobic character compared with the unmodified parent lignin precursor. In addition, the adhesion strength of these systems on different substrates was also assessed. The results of this study demonstrate an easily accessible approach to develop high-lignin-content thermosetting PE systems and provide evidence of the potential of these materials as bioderived coatings and adhesives.
中文翻译：
木质素与琥珀酸酐功能化作为生物基热固性聚酯涂料的基础
这项工作介绍了基于木质素的新型热固性聚酯（PE）涂料体系。这些新材料基于从溶剂萃取中回收的针叶木硫酸盐木质素的可溶级分功能化，并增加了其琥珀酸酐（SAn）的含量，从而通过在木质素中羟基上形成酯键来获得SAn /木质素加合物。对所得酯化材料进行了彻底的化学，物理和热表征，以证实SAn成功地共价掺入木质素大分子中。这种官能化的SAn /木质素加合物被用作在不同固化条件下制备交联的木质素基PE涂料的基础材料。这些PE涂料突出显示了改进的热稳定性，成膜能力，耐溶剂性，与未改性的亲本木质素前体相比，具有更高的动态表面硬度和更高的疏水特性。另外，还评估了这些体系在不同基材上的粘合强度。这项研究的结果证明了开发高木质素含量的热固性PE系统的一种容易获得的方法，并提供了这些材料作为生物来源的涂料和粘合剂的潜力的证据。
更新日期：2018-01-12
中文翻译：
木质素与琥珀酸酐功能化作为生物基热固性聚酯涂料的基础
这项工作介绍了基于木质素的新型热固性聚酯（PE）涂料体系。这些新材料基于从溶剂萃取中回收的针叶木硫酸盐木质素的可溶级分功能化，并增加了其琥珀酸酐（SAn）的含量，从而通过在木质素中羟基上形成酯键来获得SAn /木质素加合物。对所得酯化材料进行了彻底的化学，物理和热表征，以证实SAn成功地共价掺入木质素大分子中。这种官能化的SAn /木质素加合物被用作在不同固化条件下制备交联的木质素基PE涂料的基础材料。这些PE涂料突出显示了改进的热稳定性，成膜能力，耐溶剂性，与未改性的亲本木质素前体相比，具有更高的动态表面硬度和更高的疏水特性。另外，还评估了这些体系在不同基材上的粘合强度。这项研究的结果证明了开发高木质素含量的热固性PE系统的一种容易获得的方法，并提供了这些材料作为生物来源的涂料和粘合剂的潜力的证据。
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