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Influence of ammonium lignosulfonate on the mechanical and dimensional properties of wood fiber biocomposites reinforced with polylactic acid

机译：木质素磺酸铵对聚乳酸增强木纤维生物复合材料力学性能和尺寸性能的影响

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摘要

In order to fabricate green composites without the emission of toxic volatile compounds, wood fiber (WF) biocomposites reinforced with polylactic acid (PLA) were prepared utilizing the traditional hot-press manufacturing process. The effect of adding ammonium lignosulfonate (AL) on the mechanical and dimensional properties of the biocomposites was investigated. When the mass ratio of WF to PLA is 7:3 and the AL mass percentage is in the range from 1 to 20 w%, the modulus of rupture of the WF/PLA/AL composites ranged from 21.95 to 36.96 MPa, the modulus of elasticity ranged from 3078.6 to 4157.8 MPa and the internal bonding strength ranged from 0.69 to 1.71 MPa, which showed a 4.0-75.1% increase in modulus of rupture, a 3.5-39.8% increase in modulus of elasticity and a 21.5-201.2% increase in internal bonding strength compared to the corresponding WF/PLA composites due to the reinforcing effect of AL However, AL negatively affected the dimensional properties of the biocomposites. The thickness swell of the WF/PLA/AL composites ranged from 18.7 to 43.5% and the water absorption ranged from 47.1 to 78.9%. The thickness swell, water absorption and contact angle of the WF/PLA/AL composites increased with the AL mass percentage due to its high hydrophilicity, resulting in a 1.1-132.6% and a 3.4-67.4% increase in thickness swell and water absorption, respectively. AL had a positive effect on the crystallinity of the biocomposites due to its good surface activity as long as the AL mass percentage was below 20 wa. The fractured surface of the WF/PL/AL composites clearly showed that a strong bond (mechanical interlocking and/or chemical bonding) exists at the interface resulting in an effective stress transfer. (C) 2015 Elsevier B.V. All rights reserved.
机译：为了制造绿色复合材料而不释放有毒挥发性化合物，利用传统的热压制造工艺制备了用聚乳酸（PLA）增强的木纤维（WF）生物复合材料。研究了添加木质素磺酸铵（AL）对生物复合材料的力学性能和尺寸性能的影响。当WF与PLA的质量比为7：3且AL质量百分比为1至20 w％时，WF / PLA / AL复合材料的破裂模量为21.95至36.96 MPa，弹性范围为3078.6至4157.8 MPa，内部粘结强度范围为0.69至1.71 MPa，其断裂模量增加4.0-75.1％，弹性模量增加3.5-39.8％，而弹性模量增加21.5-201.2％由于AL的增强作用，与相应的WF / PLA复合材料相比，其内部粘合强度更高。但是，AL对生物复合材料的尺寸特性产生负面影响。 WF / PLA / AL复合材料的厚度膨胀率为18.7％至43.5％，吸水性为47.1％至78.9％。 WF / PLA / AL复合材料的厚度膨胀率，吸水率和接触角由于其高亲水性而随AL质量百分比的增加而增加，导致厚度膨胀率和吸水率分别增加1.1-132.6％和3.4-67.4％，分别。只要AL质量百分比低于20 wa，AL就具有良好的表面活性，因此对生物复合材料的结晶度具有积极影响。 WF / PL / AL复合材料的断裂表面清楚地表明，在界面处存在牢固的结合（机械互锁和/或化学结合），从而导致有效的应力传递。 （C）2015 Elsevier B.V.保留所有权利。

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