液体端羧基丁腈橡胶增韧改性氰酸酯树脂

采用液体端羧基丁腈橡胶对双酚A 型氰酸酯树脂进行增韧改性, 通过对体系凝胶曲线和DSC 曲线分析, 确定了体系的固化条件, 并在与纯CE 比较的基础上, 通过FTIR 和DSC 曲线知道了CTBN 在低温阶段对体系固化有较为明显的影响, 而在高温阶段对CE 固化影响较小。通过对固化树脂微观性能、力学性能和电性能的观测, 发现当CTBN 含量为15 %时, 改性体系的弯曲强度和冲击强度分别提高了39.47 %和21.92 %, 改性体系综合力学性能最佳, 但电性能稍有下降。另外, 固化树脂的TGA 曲线和HDT 曲线表明树脂的耐热性能随着CTBN 用量的增大而下降, 当CTBN 含量从0 提高到15 %时, 树脂体系的起始分解温度从407 ℃降低到383 ℃

CYANATE ESTERS MODIFIED BY CARBOXYL-TERMINATEDLIQUID BUTADIENE-ACRYLONITRILE

Cyanate esters were modified by carboxyl terminated liquid butadiene-acrylonitrile (CTBN) to improve theirtoughness. Optimized curing parameters were obtained by gel time curves and differential scanning calorimetry (DSC) ofthe systems. Fourier transform infrared spectrometry (FTIR) and DSC were employed to show the curing behavior of thesystems. It was observed , by comparison with purified cyanate esters , that the addition of CTBN has large influence onthe curing behavior of the systems during lower temperature , but little during higher temperature. Scanning electron microscopy (SEM) was employed to show the micro properties of the cured matrixes ; mechanical properties and dielectricproperties of the cured resin were measured. It showed that when 15 % CTBN was added to CE , the best modified systemwas gotten ; its flexural strength and impact strength were increased 39.47 % and 21.92 % , respectively. Additionally , asshown in the TGA curves of the systems , with the increasing content of CTBN from 0 to 15 % , the thermal degradationtemperature decreased from 407 ℃to 383 ℃.