We prepared epoxidized soybean oil (ESO) grafted with carboxyl-terminated poly(acrylonitrile-co-butadiene) (CTBN) (ESO-g-CTBN) by a ring-opening reaction between the epoxide group and the carboxyl group. The structural features of the resulting product were determined using modern analytical techniques, such as Fourier transform infrared (FTIR) spectroscopy, proton nuclear magnetic resonance ( 1 H NMR) spectroscopy, and gel permeation chromatography (GPC). The ESO-g-CTBN was applied as a toughener for an epoxy resin-based composite that was fabricated by blending the epoxy resin with diethylenetriamine (DETA) as the curing agent. The main aim of this procedure is to simultaneously improve the mechanical properties and fracture toughness of a bisphenol A-based epoxy resin. When 15 phr of ESO-g-CTBN was added to the EP/DETA mixture, the resin fracture toughness ( K IC ) and tensile strength increased from 0.65 to 1.09 MPa m 1/2 and from 34.42 to 42.55 MPa, respectively. The ESO-g-CTBN existed in the EP matrix as a separate phase and induced an increase in the K IC via stopping crack growth or changing the crack direction. The epoxydized soybean oil grafted with CTBN (ESO-g-CTBN) was synthesized from ring opening reaction between epoxide group and carboxyl group. The ESO-g-CTBN help to improve the fracture toughness of epoxy resin by the mechanism as shown in the figure.

中文翻译：

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环氧化豆油接枝CTBN作为新型增韧剂提高环氧树脂断裂韧性和力学性能

我们通过环氧基和羧基之间的开环反应制备了接枝有羧基封端的聚（丙烯腈-共丁二烯）（CTBN）（ESO-g-CTBN）的环氧化大豆油（ESO）。所得产物的结构特征使用现代分析技术确定，例如傅里叶变换红外 (FTIR) 光谱、质子核磁共振 ( 1 H NMR) 光谱和凝胶渗透色谱 (GPC)。ESO-g-CTBN 被用作环氧树脂基复合材料的增韧剂，该复合材料是通过将环氧树脂与作为固化剂的二亚乙基三胺 (DETA) 混合制成的。该程序的主要目的是同时提高双酚 A 基环氧树脂的机械性能和断裂韧性。当 15 份 ESO-g-CTBN 加入到 EP/DETA 混合物中时，树脂断裂韧性 (K IC ) 和拉伸强度分别从 0.65 增加到 1.09 MPa m 1/2 和从 34.42 增加到 42.55 MPa。ESO-g-CTBN 作为单独的相存在于 EP 基体中，并通过阻止裂纹扩展或改变裂纹方向导致 K IC 增加。通过环氧基与羧基的开环反应合成了接枝CTBN的环氧大豆油(ESO-g-CTBN)。ESO-g-CTBN通过如图所示的机理有助于提高环氧树脂的断裂韧性。通过环氧基与羧基的开环反应合成了接枝CTBN的环氧大豆油(ESO-g-CTBN)。ESO-g-CTBN通过如图所示的机理有助于提高环氧树脂的断裂韧性。通过环氧基与羧基的开环反应合成了接枝CTBN的环氧大豆油(ESO-g-CTBN)。ESO-g-CTBN通过如图所示的机理有助于提高环氧树脂的断裂韧性。