Kim Joo Ran, Kim Jung J
Fiber Science, Cornell University, Ithaca, NY 14853, USA.
Department of Civil Engineering, Kyungnam University, Changwon-si 51767, Korea.
Materials (Basel). 2017 Apr 27;10(5):464. doi: 10.3390/ma10050464.
Epoxidized natural rubber fibers (ERFs) are developed through one-step electrospinning and directly deposited into epoxy resins without collecting and distributing of fibers. The shape of ERFs shows rough surface due to different evaporation rate of solvent mixture consisting of chloroform and dichloromethane and the average diameter of ERFs is 6.2 µm. The increase of ERFs loading from 0 to 20 wt % into the epoxy resin increases the fracture strain significantly from 1.2% to 13% and toughness from 0.3 MPa to 1.9 MPa by a factor of 7. However, the tensile strength and Young's modulus decrease about 34% from 58 MPa to 34 MPa and from 1.4 GPa to 0.9 GPa, respectively. Due to the crosslinking reactions between oxirane groups of ERFs and amine groups in the resin, surface roughness and the high aspect ratio of ERFs, ERFs result in more effective toughening effect with the minimum loss of tensile properties in epoxy resins.
环氧化天然橡胶纤维（ERFs）通过一步电纺丝法制备，并直接沉积到环氧树脂中，无需收集和分散纤维。由于由氯仿和二氯甲烷组成的溶剂混合物蒸发速率不同，ERFs的表面呈现粗糙状态，其平均直径为6.2 µm。将ERFs在环氧树脂中的负载量从0 wt%增加到20 wt%，显著提高了断裂应变，从1.2%提高到13%，韧性从0.3 MPa提高到1.9 MPa，提高了7倍。然而，拉伸强度和杨氏模量分别从58 MPa降至34 MPa和从1.4 GPa降至0.9 GPa，下降了约34%。由于ERFs的环氧乙烷基团与树脂中的胺基团之间发生交联反应，以及ERFs的表面粗糙度和高长径比，ERFs在环氧树脂中产生了更有效的增韧效果，同时拉伸性能损失最小。
