Monodispersive functionalized lignin fractions and components as precusors for fiber production

该项目的目标是为制备和研究木质素聚合物作为碳纤维生产的前驱体进行科学工作。此外，还将考察改性的工业木质素，以及由木质素化合物合成的模型物质。在纤维生产中，工业木质素往往表现出较大的分子质量贡献和较低的反应性，可用于交联剂，从而导致纤维不均匀。较窄的分子质量贡献应通过木质素的分馏得到。应通过化学和酶氧修饰的方法插入新的反应中心。像多糖这样的杂质是另一个重要问题。这些都应该通过纤维素酶和半纤维素酶的酶处理来减少。在平行模型中，来自典型木质素化合物的物质将被聚合。所有这些木质素都将被用于热塑性制备木质素纤维。

The objective of the project are scientific works to the preparation and investigation of lignin-based polymers as a precursor for the carbon fibre production. Besides, modified technical lignins and, on the other hand, model substances which are synthesised from lignin compounds will be examined. Technical lignin often shows a wide molecular mass contribution, as well as low reactivities which can be used for an interlinking in the fibre production, which results in non homogenous fibers. Narrower molecular mass contribution should be received by a fractionation of lignins. New reactive centres should be inserted by means of chemical and enzymatical oxygen modification. Impurities like polysaccharides are another important problem. These should be reduced by an enzymatically treatment with cellulases and hemi cellulases. In parallel model substances from typical lignin compounds will be polymerized.All of these lignins will tested for thermo-plastically preparation of lignin fibers.