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首页> 美国卫生研究院文献>Materials >Improved Toughness in Lignin/Natural Fiber Composites Plasticized with Epoxidized and Maleinized Linseed Oils
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Improved Toughness in Lignin/Natural Fiber Composites Plasticized with Epoxidized and Maleinized Linseed Oils

机译：环氧和马来酸亚麻籽油增塑的木质素/天然纤维复合材料的韧性提高

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摘要

The use of maleinized (MLO) and epoxidized (ELO) linseed oils as potential biobased plasticizers for ligninatural fiber composites formulations with improved toughness was evaluated. Arboform , a ligninatural fiber commercial composite, was used as a reference matrix for the formulations. The plasticizer content varied in the range 0–15 wt % and mechanical, thermal and morphological characterizations were used to assess the potential of these environmentally friendly modifiers. Results from impact tests show a general increase in the impact-absorbed energy for all the samples modified with bio-oils. The addition of 2.5 wt % of ELO to Arboform (5.4 kJ/m ) was able to double the quantity of absorbed energy (11.1 kJ/m ) and this value slightly decreased for samples containing 5 and 10 wt %. A similar result was obtained with the addition of MLO at 5 wt %, with an improvement of 118%. The results of tensile and flexural tests also show that ELO and MLO addition increased the tensile strength as the percentage of both oils increased, even if higher values were obtained with lower percentages of maleinized oil due to the possible presence of ester bonds formed between multiple maleic groups present in MLO and the hydroxyl groups of the matrix. Thermal characterization confirmed that the mobility of polymer chains was easier in the presence of ELO molecules. On the other hand, MLO presence delayed the crystallization event, predominantly acting as an anti-nucleating agent, interrupting the folding or packing process. Both chemically modified vegetable oils also efficiently improved the thermal stability of the neat matrix.
机译：评估了马来化（MLO）和环氧化（ELO）亚麻籽油作为具有改善的韧性的木质素/天然纤维复合材料配方的潜在生物基增塑剂的用途。木质素/天然纤维商业复合物Arboform被用作制剂的参考基质。增塑剂的含量在0-15 wt％的范围内变化，并且通过机械，热学和形态学表征来评估这些环境友好型改性剂的潜力。冲击试验的结果表明，所有用生物油改性的样品的冲击吸收能量都普遍增加。向Arboform中添加2.5 wt％的ELO（5.4 kJ / m）可使吸收能量（11.1 kJ / m）翻倍，并且对于包含5 wt％和10 wt％的样品，该值略有降低。通过添加5 wt％的MLO可获得类似的结果，改善了118％。拉伸和弯曲试验的结果还表明，即使两种油的百分比增加，即使添加了较低的马来化油百分比，由于添加了多个马来酸而可能存在酯键，即使添加了较高的值，ELO和MLO的添加也会提高抗张强度。 MLO中存在的基团和基质的羟基。热表征证实，在存在ELO分子的情况下，聚合物链的迁移更容易。另一方面，MLO的存在延迟了结晶事件，主要起着抗核剂的作用，从而中断了折叠或堆积过程。两种化学改性的植物油也有效地改善了纯基质的热稳定性。

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