Performance of biocomposites from surface modified regenerated cellulose fibers and lactic acid thermoset bioresin
Performance of biocomposites from surface modified regenerated cellulose fibers and lactic acid thermoset bioresin
复制标题
表面改性再生纤维素纤维和乳酸热固性生物树脂生物复合材料的性能
DOI：
10.1007/s10570-015-0643-x
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发表时间：
2015
期刊：
影响因子：
5.7
通讯作者：
M. Skrifvars
中科院分区：
文献类型：
--
作者：
S. Ramamoorthy;F. Bakare;Rene Herrmann;M. Skrifvars
以乳酸热固性生物树脂为增强剂，研究了硅烷和碱两种表面处理对再生纤维素纤维性能的影响。进行表面处理以改善纤维-基质界面的物理化学相互作用。用拉伸、弯曲和冲击试验作为界面强度提高的指标。此外，热导率，粘弹性测量以及显微镜图像被用来表征纤维表面处理和对基质粘附的影响。结果表明，硅烷处理提高了复合材料的力学性能，因为硅烷分子在纤维素纤维和树脂之间起连接作用（纤维与硅氧烷桥键结合，树脂与双官能团硅烷分子的有机官能团结合），使复合材料的界面相具有分子连续性。由于硅烷处理改善了纤维与基体之间的界面和互锁，孔隙率显著降低。吸水率的降低和接触角的增加证实了复合材料亲水性的变化。硅烷处理增强材料的存储模量增加，而阻尼强度降低，表明硅烷处理增强材料的纤维与基体的粘附性更好。热重分析表明，处理后增强材料的热稳定性发生了变化。采用差示扫描量热法对树脂固化过程进行了跟踪，并提出了后固化的必要性。采用有限元分析对复合材料的热行为进行了预测，并采用非破坏性共振分析对拉伸试验获得的模量进行了验证。碱处理纤维增强的复合材料也发生了同样的变化。显微镜图像证实了硅烷处理过的纤维与树脂在界面处的良好粘附。
The effect of surface treatments, silane and alkali, on regenerated cellulose fibers was studied by using the treated fibers as reinforcement in lactic acid thermoset bioresin. The surface treatments were performed to improve the physico–chemical interactions at the fiber–matrix interface. Tensile, flexural and impact tests were used as indicator of the improvement of the interfacial strength. Furthermore, thermal conductivity, viscoelasticity measurements as well as microscopy images were made to characterize the fiber surface treatments and the effect on adhesion to the matrix. The results showed that silane treatment improved the mechanical properties of the composites as the silane molecule acts as link between the cellulose fiber and the resin (the fiber bonds with siloxane bridge while the resin bonds with organofunctional group of the bi-functional silane molecule) which gives molecular continuity in the interphase of the composite. Porosity volume decreased significantly on silane treatment due to improved interface and interlocking between fiber and matrix. Decrease in water absorption and increase in contact angle confirmed the change in the hydrophilicity of the composites. The storage modulus increased when the reinforcements were treated with silane whereas the damping intensity decreased for the same composites indicating a better adhesion between fiber and matrix on silane treatment. Thermogravimetric analysis indicated that the thermal stability of the reinforcement altered after treatments. The resin curing was followed using differential scanning calorimetry and the necessity for post-curing was recommended. Finite element analysis was used to predict the thermal behavior of the composites and a non-destructive resonance analysis was performed to ratify the modulus obtained from tensile testing. The changes were also seen on composites reinforced with alkali treated fiber. Microscopy images confirmed the good adhesion between the silane treated fibers and the resin at the interface.