Fibre and Polymer Technology, Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
Biomacromolecules. 2011 Apr 11;12(4):1355-62. doi: 10.1021/bm200128s. Epub 2011 Mar 2.
Biomass is converted to oxygen barriers through a conceptually unconventional approach involving the preservation of the biomass native interactions and macromolecular components and enhancing the effect by created interactions with a co-component. A combined calculation/assessment model is elaborated to understand, quantify, and predict which compositions that provide an intermolecular affinity high enough to mediate the molecular packing needed to create a functioning barrier. The biomass used is a wood hydrolysate, a polysaccharide-rich but not highly refined mixture where a fair amount of the native intermolecular and intramolecular hemicelluloses-lignin interactions are purposely preserved, resulting in barriers with very low oxygen permeabilities (OP) both at 50 and 80% relative humidity and considerably lower OPs than coatings based on the corresponding highly purified spruce hemicellulose, O-acetyl galactoglucomannan (AcGGM). The component interactions and mutual affinities effectively mediate an immobilization of the chain segments in a dense disordered structure, modeled through the Hansen's solubility parameter concept and quantified on the nanolength scale by positron annihilation lifetime spectrum (PALS).
生物质通过一种概念上非常规的方法转化为氧气屏障，该方法涉及保留生物质的天然相互作用和高分子成分，并通过与共组分的相互作用来增强效果。阐述了一种组合计算/评估模型，以理解、量化和预测哪些成分提供足够高的分子间亲和力来介导所需的分子堆积，从而形成有效的屏障。所使用的生物质是一种木质水解物，是一种富含多糖但未经高度精制的混合物，其中相当一部分天然的胞间和胞内半纤维素-木质素相互作用被有意保留，从而形成的屏障在 50%和 80%相对湿度下的氧气透过率（OP）都非常低，并且比基于相应高度纯化的云杉半纤维素、O-乙酰基半乳糖甘露聚糖（AcGGM）的涂层的 OP 低得多。组件相互作用和相互亲和力有效地介导链段在密集无序结构中的固定，通过 Hansen 溶解度参数概念进行建模，并通过正电子湮没寿命谱（PALS）在纳米长度尺度上进行量化。
