摘要
针对双酚A型环氧树脂交联固化后韧性差易开裂的工艺难题,采用端氨基聚醚对环氧树脂进行增韧改性;采用黏度计和差示扫描量热仪研究了增韧前后树脂胶液固化过程并确定固化制度;采用固化动力学分析法推导了增韧后环氧树脂的固化动力学方程式;采用DSC法、DMA法和TG法研究了增韧剂对树脂浇注体Tg值和热分解性能的影响;测试了增韧前后树脂浇注体和复合材料的力学性能;采用SEM分析了浇注体和复合材料横截面形貌并推测了增韧机理。结果表明:当添加15份增韧剂时,浇注体的拉伸强度达到了最大值69.8 MPa,相比与未增韧前提升了54.1%;冲击韧性较未增韧前提升了42.4%。此时复合材料的力学性能较未增韧前均有大幅度增加,达到了增韧增强的目的。
Aiming at the process problem of poor toughness and easy cracking of bisphenol A epoxy resin after crosslinking and curing,the terminal amino polyether is used to toughen and modify the epoxy resin.The curing process of resin glue before and after toughening was studied by viscometer and differential scanning calorimeter and the curing system was determined.The curing kinetic equation of the toughened epoxy resin was derived by curing kinetic analysis.The effects of flexibilizer on Tg value and thermal decomposition performance of resin casting body were studied by DSC method,DMA method and TG method.The mechanical properties of resin casts and composites before and after toughening were tested,and the cross-sectional morphology of castings and composites was analyzed by SEM and the fracture mechanism was speculated.The results showed that when 15 parts of toughe⁃ning agent were added,the tensile strength of the cast reached a maximum of 69.8 MPa,which was 54.1%higher than before toughening.The impact toughness of the cast has increased by 42.4%compared with before toughening.At this time,the mechanical properties of the composite materials have increased significantly compared with before toughening,and the purpose of toughening and strengthening has been achieved.
作者
张为军
王丹
杨凯凯
陈锋
ZHANG Weijun;WANG Dan;YANG Kaikai;CHEN Feng(Beijing Composite Materials Co.,Ltd.,Beijing 102101,China;Economic and Technological Development Center of SASTIND,Beijing 100081,China;Shandong Branch,Sinoma Science&Technology Co.,Ltd.,Tengzhou 277500,China;Beijing Composite Materials(Tengzhou)Co.,Ltd.,Tengzhou 277500,China)
出处
《复合材料科学与工程》
CAS
北大核心
2023年第8期26-33,共8页
Composites Science and Engineering
基金
中国建材集团攻关专项资助(2021HX1617)。
关键词
环氧树脂
增韧增强
“海岛结构”
浇注体
复合材料
epoxy resin
toughening enhancement
“Island Structure”
casting body
composites
