玻璃纤维增强BT树脂复合材料的制备及性能研究

Preparation and Properties of Glass Fiber Reinforced BT Resin Composites

传统的双马树脂基纤维复合材料具有脆性大、耐冲击性能差等缺点,在加工时产生应力集中导致制品受损,导致其应用困难。将2,2’-双[4-(4-马来酰亚胺基苯氧基)苯基]丙烷(BMI-80)树脂与氰酸酯(CE)树脂混合,得到双马来酰亚胺-三嗪树脂(BT)树脂胶液,将玻璃纤维浸入BT树脂胶液制备玻纤增强BT复合材料,对玻纤增强BT复合材料的结构和性能进行表征。结果表明:CE树脂在固化过程中生成三嗪环且反应完全。BT复合材料具有良好的力学性能,其弯曲强度大于150 MPa、弯曲模量大于10 GPa。当CE树脂添加量为25%,BT复合材料的冲击强度最大为30.53 k J/m^(2)。在100 kHz频率下,BT复合材料的介电常数均为(3.5±0.1),介电损耗在0.016以下。BT复合材料的DMA曲线仅显示单个正切损耗峰,表明固化后树脂体系具有良好的相容性。

The traditional bismaleimide resin-based fiber composites have the disadvantages of high brittleness and poor impact resistance.Stress concentration during processing leads to damage of the products,which makes it difficult to apply.2,2’-Bis[4-(4-maleimidophenoxy)phenyl]propane(BMI-80)resin was mixed with cyanate ester(CE)resin to obtain bismaleimide-triazine resin(BT)resin glue.Glass fiber was immersed in BT resin glue to prepare glass fiber reinforced BT composites.The structure and properties of glass fiber reinforced BT composites were characterized.The results show that CE resin generates a triazine ring during the curing process and the reaction is complete.BT composite has good mechanical properties,which bending strength is greater than 150 MPa and bending modulus is greater than 10 GPa.When the content of CE resin is 25%,the maximum impact strength of BT composite is 30.53 kJ/m^(2).The dielectric constant of BT composite is(3.5±0.1)at 100 kHz,and the dielectric loss is below 0.016.The DMA curves of BT composites only show a single tangent loss peak,indicating that the cured resin system has good compatibility.