木质素

Abstract(#br)Novel bio-inspired materials derived from crystalline nanocellulose (CNC) have been tested as wood consolidants. A suspension of CNC, produced by acid hydrolysis of cellulose and used as such or mixed with lignin and/or siloxane derivatives (PDMS), was applied on rotted wood samples of Norway spruce. X-Ray diffraction analysis on CNC powder showed high crystallinity index. Dynamic light scattering (DLS) measurement indicated a nearly uniform particle size distribution with an average hydrodynamic diameter for pure CNC smaller than that in the mixtures.

AbstractPolysiloxane-based polyurethane/lignin elastomers are synthesized via pre-polymerization. Isophorone diisocyanate (IPDI) reacts with polycarbonate (PCDL) and polydimethylsiloxane (PDMS) polyol to produce a linear thermoplastic elastomer. Lignin is added to the matrix of the polyurethane, where lignin not only acts as a crosslinking agent but also as filler. The effects of polysiloxane-based polyurethane/lignin elastomers on thermal properties, mechanical properties, surface hydrophobicity, and cytotoxicity in vitro are investigated.

摘要\n采用预聚法合成了聚硅氧烷基聚氨酯/木质素弹性体。异佛尔酮二异氰酸酯( IPDI )与聚碳酸酯( PCDL )和聚二甲基硅氧烷( PDMS )多元醇反应生成线性热塑性弹性体。木质素被添加到聚氨酯的基体中，其中木质素不仅作为交联剂而且作为填料。研究了聚硅氧烷基聚氨酯/木质素弹性体对其热性能、力学性能、表面疏水性和体外细胞毒性的影响。材料的耐热性、表面疏水性和机械强度得到了提高，MTT法检测发现材料对HeLa细胞的细胞毒活性降低，这与木质素的半互穿网络结构和低毒性有关。当木质素添加量为1 wt %时，细胞存活率提高到65.2 %，机械强度提高到17.1 Mpa，接触角提高到108.2°。