Application of dynamic 2D FTIR to cellulose
Application of dynamic 2D FTIR to cellulose
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DOI：
10.1016/s0924-2031(99)00063-6
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发表时间：
2000-02-01
影响因子：
2.5
通讯作者：
Salmén, L
中科院分区：
文献类型：
--
作者：
Hinterstoisser, B;Salmén, L
纤维素是生物界中的主要聚合物，是由（1，4）-β-D-吡喃葡萄糖组成的均多糖。纤维素聚合物链之间和之内的相互作用主要由分子间和分子内氢键决定，因此其主要负责纤维素材料的机械性能。动态力学分析（DMA）和二维步进扫描傅里叶变换红外（FTIR）光谱的耦合，被证明是一个非常有前途的方式，调查这些亚分子之间的相互作用在纤维素材料。纤维素振动光谱的OH伸缩振动区域（3100和3700 cm（-1））中的宽的和非结构化的带，其包含关于分子内和分子间氢键的信息，可以通过这种新技术来解开。在这里报道的实验中，纤维素片已被拉伸正弦曲线在低应变，而被照射的偏振红外光。对于所获得的动态IR信号（样品的同相和异相响应），定义了动态IR互相关。它包括两个术语，被称为同步和异步的二维红外相关强度。在通过DMA-FTIR获得的二维光谱中，在3700和3100 cm（-1）之间的OH范围内观察到几个明显的峰，这可能与特定的相互作用有关。(C)2000爱思唯尔科技有限公司。保留所有权利。
Cellulose, the dominant polymer in the bio sphere, is a homopolysaccharide composed of (1,4)-beta-D-glucopyranose. Interactions between and within the cellulose polymer chains are mainly determined by inter- and intramolecular hydrogen bonds, which are therefore mainly responsible for mechanical properties of cellulosic materials. The coupling of dynamic mechanical analysis (DMA) and 2D step-scan Fourier transform infrared (FTIR) spectroscopy, is shown to be a very promising way of investigating these submolecular interactions in cellulosic materials. The broad and unstructured band in the OH-stretching vibration region (3100 and 3700 cm(-1)) of the cellulose vibrational spectra, which contains information about the intra- and intermolecular hydrogen bonds, can be unraveled by this new technique. In the experiments reported here, cellulose sheets have been stretched sinusoidally at low strains while being irradiated with polarized infrared light. For the obtained dynamic IR signals (the in-phase and the out-of-phase responses of the sample), the dynamic IR cross-correlation was defined. It consists of two terms which are referred to as the synchronous and the asynchronous 2D infrared correlation intensities. In the 2D spectra, obtained by DMA-FTIR, several distinct peaks are observed in the OH-range between 3700 and 3100 cm(-1) which may be related to specific interactions. (C) 2000 Elsevier Science B.V. All rights reserved.