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首页> 外文期刊>ACS applied materials & interfaces >Micromechanics of TEMPO-Oxidized Fibrillated Cellulose Composites
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Micromechanics of TEMPO-Oxidized Fibrillated Cellulose Composites

机译：TEMPO氧化原纤化纤维素复合材料的微力学

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摘要

Composites of poly(lactic) acid (PLA) reinforced with TEMPO-oxidized fibrillated cellulose (TOFC) were prepared to 15, 20, 25, and 30% fiber weight fi-actions. To aid dispersion and to improve stress transfer, we acetylated the TOFC prior to the fabrication of TOFC-PLA composite films. Raman spectroscopy was employed to study the deformation micromechanics in these systems. Microtensile specimens were prepared from the films and deformed in tension with Raman spectra being collected simultaneously during deformation. A shift in a Raman peak initially located at ～1095 cm~(-1), assignedto C-O-C stretching of the cellulose backbone, was observed upon deformation, indicating stress transfer from the matrbi to the TOFC reinforcement. The highest band shift rate, with respect to strain, was observed in composites having a 30% weight fraction of TOFC. These composites also displayed a significantly higher strain to failure compared to pure acetylated TOFC film, and to the composites having lower weight fractions of TOFC. The stress-transfer processes that occur in microfibrillated cellulose composites are discussed with reference to the micromechanical data presented. It is shown that these TOFC-based composite materials are progressively dominated by the mechanics of the networks, and a shear-lag type stress transfer between fibers.
机译：用TEMPO氧化原纤化纤维素（TOFC）增强的聚乳酸（PLA）复合材料的纤维重量分数分别为15％，20％，25％和30％。为了帮助分散并改善应力传递，我们在制造TOFC-PLA复合膜之前将TOFC乙酰化。拉曼光谱用于研究这些系统中的变形微力学。由薄膜制备微拉伸试样，并在拉伸过程中变形，同时在变形过程中同时收集拉曼光谱。在变形时观察到拉曼峰最初位于〜1095 cm〜（-1）处的位移，该位移与纤维素主链的C-O-C拉伸有关，表明应力从matrbi传递到TOFC增强材料。相对于应变，在TOFC重量分数为30％的复合材料中观察到最高的带移速率。与纯乙酰化的TOFC薄膜相比，这些复合材料还显示出明显更高的破坏应变，并且与TOFC的重量分数较低的复合材料相比。参考提供的微机械数据讨论了微纤化纤维素复合材料中发生的应力传递过程。结果表明，这些基于TOFC的复合材料逐渐受到网络力学和纤维之间剪切滞后型应力转移的支配。

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