木质素辅助稳定定向液晶纤维素中间体的局限性和潜力

IF 5.4 1区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

GIANT Pub Date : 2024-11-12 DOI:10.1016/j.giant.2024.100344

F. Robert Gleuwitz , Gopakumar Sivasankarapillai , Ahmed Bentaleb , Nadine Kohlhuber , Marie-Pierre G. Laborie

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引用次数: 0

摘要

本研究旨在从根本上了解在基于羟丙基纤维素和硬木有机溶胶木质素的聚合物混合物的溶液加工材料中观察到的木质素辅助微结构稳定现象。对剪切浇注共混薄膜进行的机械分析、偏振红外光谱分析和广角 X 射线散射分析表明，木质素对流动性纤维素介相的影响同样适用于由作为液晶基质聚合物的乙基纤维素和作为分散 "微结构粘合剂 "的碱催化解聚产生的木质素低聚物组成的共混物。研究结果强调了溶剂在连续纤维素相和分散木质素相之间扩散的重要作用，这归因于聚合物/低聚物与溶剂之间的相互作用。木质素相中的大量溶剂会破坏微结构稳定效应。我们提出了平衡质子供体活性的概念，将溶剂扩散与各向同性液晶相的形成、宏观和微观混合结构形态以及溶液加工方面联系起来。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Limitation and potential of lignin-assisted stabilisation of oriented liquid crystalline cellulosic mesophase

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Limitation and potential of lignin-assisted stabilisation of oriented liquid crystalline cellulosic mesophase

This study aimed at progressing in the fundamental understanding of the lignin-assisted microstructural stabilisation observed in solution-processed materials based on the polymer blend of hydroxypropyl cellulose and hardwood organosolv lignin. Mechanical analysis, polarised infrared spectroscopy and wide-angle X-ray scattering of shear cast blend films revealed that the effect of lignin on the flow-oriented cellulosic mesophase is also valid for blends composed of ethyl cellulose as liquid crystalline matrix polymer and lignin derived oligomers from base-catalysed depolymerisation as dispersed “microstructural cementing agent”. The results underline the significant role of the solvent diffusion between the continuous cellulosic and the dispersed lignin phase, which is ascribed to polymer-/oligomer-solvent interactions. An abundance of the solvent within the lignin phase caused the disruption of the microstructural stabilisation effect. The concept of a balanced proton-donor activity was introduced linking the solvent diffusion with the lyotropic liquid crystalline phase formation, the macro- and microstructural blend morphology and aspects regarding the solution processing.

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来源期刊

GIANT Multiple-

CiteScore

8.50

自引率

8.60%

发文量

审稿时长

42 days

期刊介绍： Giant is an interdisciplinary title focusing on fundamental and applied macromolecular science spanning all chemistry, physics, biology, and materials aspects of the field in the broadest sense. Key areas covered include macromolecular chemistry, supramolecular assembly, multiscale and multifunctional materials, organic-inorganic hybrid materials, biophysics, biomimetics and surface science. Core topics range from developments in synthesis, characterisation and assembly towards creating uniformly sized precision macromolecules with tailored properties, to the design and assembly of nanostructured materials in multiple dimensions, and further to the study of smart or living designer materials with tuneable multiscale properties.