PDF(Pubmed)
Abstract：
This study describes the production of a new biobased epoxy thermoset and its use with long hemp fibres to produce high-performance composites that are totally biobased. The synthesis of BioIgenox, an epoxy resin derived from a lignin biorefinery, and its curing process have been optimised to decrease their environmental impact. The main objective of this study is to characterise the rheology and kinetics of the epoxy system with a view to optimising the composite manufacturing process. Thus, the epoxy resin/hardener system was chosen considering the constraints imposed by the implementation of composites reinforced with plant fibres. The viscosity of the chosen mixture shows the compatibility of the formulation with the traditional implementation processes of the composites. In addition, unlike BPA-a precursor of diglycidyl ether of bisphenol A (DGEBA) epoxy resin-BioIgenox and its precursor do not have endocrine disrupting activities. The neat polymer and its unidirectional hemp fibre composite are characterised using three-point bending tests. Results measured for the fully biobased epoxy polymer show a bending modulus, a bending strength, a maximum strain at failure and a Tg of, respectively, 3.1 GPa, 55 MPa, 1.82% and 120 °C. These values are slightly weaker than those of the DGEBA-based epoxy material. It was also observed that the incorporation of fibres into the fully biobased epoxy system induces a decrease in the damping peak and a shift towards higher temperatures. These results point out the effective stress transfers between the hemp fibres and the fully biobased epoxy system. The high mechanical properties and softening temperature measured in this work with a fully biobased epoxy system make this type of composite a very promising sustainable material for transport and lightweight engineering applications.
摘要：
这项研究描述了一种新的生物基环氧树脂热固性材料的生产及其与长麻纤维一起使用，以生产完全基于生物的高性能复合材料。BioIgenox的合成，来自木质素生物炼制的环氧树脂，其固化过程已经过优化，以减少其对环境的影响。这项研究的主要目的是表征环氧树脂体系的流变性和动力学，以优化复合材料的制造过程。因此，环氧树脂/硬化剂系统的选择是考虑到植物纤维增强复合材料的实施所施加的限制。所选混合物的粘度表明配方与复合材料的传统实施方法的相容性。此外,与BPA-双酚A（DGEBA）环氧树脂的二缩水甘油醚的前体不同，BioIgenox及其前体没有内分泌干扰活性。使用三点弯曲测试表征纯聚合物及其单向大麻纤维复合材料。对完全生物基环氧聚合物的测量结果显示弯曲模量，弯曲强度，破坏时的最大应变和Tg为，分别,3.1GPa,55MPa,1.82%和120℃这些值比基于DGEBA的环氧材料的值稍弱。还观察到,将纤维结合到完全生物基环氧体系中引起阻尼峰的降低和向更高温度的偏移。这些结果指出了大麻纤维和完全生物基环氧树脂体系之间的有效应力传递。在这项工作中使用完全生物基环氧体系测量的高机械性能和软化温度使这种复合材料成为运输和轻质工程应用的非常有前途的可持续材料。
