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首页> 外文期刊>ACS Omega >Characterization of Individual Hydrogen Bonds in Crystalline Regenerated Cellulose Using Resolved Polarized FTIR Spectra
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Characterization of Individual Hydrogen Bonds in Crystalline Regenerated Cellulose Using Resolved Polarized FTIR Spectra

机译：结晶极化纤维素中单个氢键的分辨极化FTIR光谱表征

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摘要

Cellulose nanofibers (CNFs), which are directly isolated as a native form, have drawn considerable attention as eco-friendly and distinctive material to be partly substituted for fossil products. In addition to the increasing attention to the native CNFs, conventional regenerated cellulose having cellulose II crystals also attracts more attention because of its cost-effective method of production in a moderately easy and repeatable fashion. Inter- and intramolecular hydrogen bonds are, in particular, thought to contribute greatly to the physical properties of cellulosic commercial products. More than half century ago, Marchessault et al. attempted to directly assign the hydroxyl (OH) group vibrations related to hydrogen bonding in infrared (IR) spectra. The assignment, however, has not been significantly updated. One reason for the delayed assignments is the difficulty in preparing pure cellulose II. Here, we show successful IR assignments of the interacted OH groups in cellulose II by using the nematic ordered cellulose to prepare a highly oriented regenerated film. The film had anisotropic crystalline domains, which provided a clearly resolved component in the IR spectra. The OH bands were well assigned, and this IR assignment becomes an effective tool to understand the structure–property relationship for engineering advanced regenerated cellulose materials.
机译：作为天然形式直接分离的纤维素纳米纤维（CNF）作为环保，独特的材料，可以部分替代化石产品而引起了广泛关注。除了对天然CNF的关注日益增加之外，具有纤维素II晶体的常规再生纤维素也因其具有成本效益的，以适度容易且可重复的方式生产的纤维素而受到更多关注。特别地，认为分子间和分子内的氢键对纤维素商业产品的物理性质有很大贡献。半个多世纪以前，马尔凯索特等人。试图在红外（IR）光谱中直接分配与氢键相关的羟基（OH）振动。但是，该分配没有得到重大更新。延迟分配的原因之一是难以制备纯纤维素II。在这里，我们显示了通过使用向列型纤维素制备高度取向的再生薄膜，成功地完成了纤维素II中相互作用的OH基团的IR分配。该膜具有各向异性的晶畴，这在红外光谱中提供了清晰分辨的成分。 OH谱带分配合理，这种IR分配成为了解工程高级再生纤维素材料的结构与性质关系的有效工具。

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