Lignin-Assisted Stabilization of an Oriented Liquid Crystalline Cellulosic Mesophase, Part A: Observation of Microstructural and Mechanical Behavior.,Biomacromolecules

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Lignin-Assisted Stabilization of an Oriented Liquid Crystalline Cellulosic Mesophase, Part A: Observation of Microstructural and Mechanical Behavior.
Biomacromolecules ( IF 5.5 ) Pub Date : 2020-01-23 , DOI: 10.1021/acs.biomac.9b01352
F Robert Gleuwitz _{1,

2} , Christian Friedrich _{2,

3} , Marie-Pierre G Laborie _{1,

2}

Affiliation

Liquid crystalline polymer blends containing lignin have been scarcely studied in the literature, albeit demonstrating potential for the design of high-performance lignin-based materials. In this study, organosolv lignin is blended in solution with hydroxypropyl cellulose (HPC), a lyotropic cellulose derivative, and its impact on the dynamics of the cellulosic liquid crystalline mesophase is investigated. Rheological measurements and rheo-optical investigations under crossed polarizers reveal that lignin enhances the persistence of the shear-induced orientation of the cellulosic macromolecules. In shear-casted films, the retention of the microstructural organization, or band texture, entails a drastic increase of the mechanical anisotropy and properties with lignin content. As the origin of the textural stabilization we propose a specific "jacketing"-like effect of lignin on HPC. This study indicates the possibility of a beneficial impact of lignin on the relaxation behavior of liquid crystalline cellulosic polymers.

中文翻译：

定向液晶纤维素中间相的木质素辅助稳定化，A部分：微结构和机械行为的观察。

文献中几乎没有研究含木质素的液晶聚合物共混物，尽管证明了设计基于木质素的高性能材料的潜力。在这项研究中，有机溶剂木质素在溶液中与溶致纤维素衍生物羟丙基纤维素（HPC）混合，并研究了其对纤维素液晶中间相动力学的影响。交叉偏振器下的流变学测量和流变光学研究表明，木质素增强了纤维素大分子的剪切诱导取向的持久性。在剪切流延膜中，微观结构的保留或条带纹理会导致机械各向异性和木质素含量的性能急剧增加。作为结构稳定的起源，我们提出了一个具体的“

更新日期：2020-02-06

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