Oliaei Erfan, Montanari Céline, Li Lengwan, Chen Hui, Olsén Peter, Berglund Lars
Wallenberg Wood Science Center, Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm 10044, Sweden.
State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
ACS Appl Mater Interfaces. 2025 Jul 30;17(30):43522-43535. doi: 10.1021/acsami.5c07130. Epub 2025 Jul 21.
Translucent wood fiber composites offer new functions to stiff composites. Most "eco-friendly" thermoset resins are only partially biobased. Poly(limonene acrylate), PLIMA, can be fully biobased and is combined with hot-pressed softwood fibers (WF) by liquid resin impregnation and curing. Fibers are random-in-plane or strongly oriented and have different lignin characteristics. Microstructure-mechanical property relationships are compared for hot-pressed WF networks and WF/PLIMA biocomposites from the same fibers. Stress transfer in WF/PLIMA biocomposites is enhanced with a modulus of up to 16.7 GPa and a tensile strength of up to 139 MPa, compared to transparent plastics like poly(methyl methacrylate) (modulus ∼3 GPa, tensile strength ∼70 MPa). Optical transmittance is high, even at 35 vol % fiber content, suggesting translucent panels or lighting applications. Eco-indicators show that the PLIMA matrix accounts for ∼80% of biocomposite cumulative energy demand (CED, cradle to gate) of 60 MJ/kg, compared to ∼120 MJ/kg for glass fiber/thermoset composites.
半透明木质纤维复合材料为硬质复合材料赋予了新功能。大多数“环保型”热固性树脂仅部分基于生物基。聚（柠檬烯丙烯酸酯）（PLIMA）可以完全基于生物基，并通过液体树脂浸渍和固化与热压软木纤维（WF）相结合。纤维在平面内随机分布或高度取向，且具有不同的木质素特性。对来自相同纤维的热压WF网络和WF/PLIMA生物复合材料的微观结构与力学性能关系进行了比较。与聚甲基丙烯酸甲酯等透明塑料（模量约3 GPa，拉伸强度约70 MPa）相比，WF/PLIMA生物复合材料中的应力传递得到增强，模量高达16.7 GPa，拉伸强度高达139 MPa。即使在纤维含量为35 vol%时，光学透过率也很高，这表明可用于半透明面板或照明应用。生态指标显示，PLIMA基体占生物复合材料60 MJ/kg的累积能源需求（CED，从摇篮到大门）的约80%，而玻璃纤维/热固性复合材料的这一数值约为120 MJ/kg。
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