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首页> 外文期刊>Journal of Polymers and the Environment >Micromechanical Tensile Testing of Cellulose-Reinforced Electrospun Fibers Using a Template Transfer Method (TTM)
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Micromechanical Tensile Testing of Cellulose-Reinforced Electrospun Fibers Using a Template Transfer Method (TTM)

机译：使用模板转移方法（TTM）的纤维素增强电纺纤维的微机械拉伸测试

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摘要

A template transfer method (TTM) and a fiber fixation technique were established for fiber handling and micro tensile stage mounting of aligned and non-aligned electrospun fiber mats. The custom-made template had been precut to be mounted on a variety of collectors, including a rapidly rotating collector used to align the fibers. The method eliminated need for direct physical interaction with the fiber mats before or during the tensile testing since the fiber mats were never directly clamped or removed from the original substrate. By using the TTM it was possible to measure the tensile properties of aligned poly(methyl methacrylate) (PMMA) fiber mats, which showed a 250 % increase in strength and 450 % increase in modulus as compared to a non-aligned system. The method was further evaluated for aligned PMMA fibers reinforced with cellulose (4 wt%) prepared as enzymatically derived nanofibrillated cellulose (NFC). These fibers showed an additional increase of 30 % in both tensile strength and modulus, resulting in a toughness increase of 25 %. The fracture interfaces of the PMMA-NFC fibers showed a low amount of NFC pull-outs, indicating favorable phase compatibility. The presented fiber handling technique is universal and may be applied where conservative estimates of mechanical properties need to be assessed for very thin fibers.
机译：建立了模板转移方法（TTM）和纤维固定技术，用于对齐和不对齐的电纺纤维毡的纤维处理和微拉伸阶段安装。定制模板已经过预先切割，可以安装在各种收集器上，包括用于对齐光纤的快速旋转收集器。该方法消除了在拉伸测试之前或期间与纤维垫直接物理相互作用的需要，因为纤维垫从未被直接夹紧或从原始基底上移走。通过使用TTM，可以测量对准的聚（甲基丙烯酸甲酯）（PMMA）纤维毡的拉伸性能，与未对准的系统相比，该纤维毡的强度增加250％，模量增加450％。对该方法进一步评估了用纤维素（4重量％）增强制成的PMMA纤维的取向性，该纤维是作为酶促纳米原纤化纤维素（NFC）制备的。这些纤维的抗张强度和模量均增加了30％，韧性增加了25％。 PMMA-NFC纤维的断裂界面显示出少量的NFC拔出，表明有利的相相容性。提出的纤维处理技术是通用的，可用于需要评估非常细纤维的机械性能的保守估计的地方。

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