摘要
采用自制的低分子量聚苯醚(PPO)对环氧树脂(EP)进行改性,得到EP/PPO复合材料,研究了低分子量PPO对复合材料的介电性能、燃烧性能、热性能、导热性能及力学性能的影响。结果表明,制备的PPO分子量均一,分布较窄。随着PPO含量的增加,复合材料的不同频率下介电常数均显著降低,当PPO的添加量为15%时,复合材料的介电损耗降低至0.003(2M)。EP/PPO体系具有较低的热释放速率和较好抑烟效果,材料的导热性能提高。当PPO的添加量为30%时,复合材料的热释放速率峰值和总热释放分别下降至518.7 kW/m^(2)和95.4 MJ/m^(2),与纯EP相比,分别降低了45.3%和6.2%;热导率达到0.0874 W/(m·K),残炭量从15.4%提高至19.0%;当PPO的含量为25%时,复合材料的总烟释放量和总烟释放速率分别下降了38.6%和38.7%。采用SEM观察EP/PPO复合材料液氮脆断后样品截面的微观结构,结果表明,EP与PPO的相容性较好,因此,PPO改性EP不会影响EP的力学性能。
Modified epoxy resin(EP)composite were prepared by incorporating the low molecular weight polyphenyl ether.The effect of PPO on dielectric properties,flame retardant properties,thermal properties,thermal conductivity properties and mechanical properties of EP composite were studied.The results showed that the molecular weight of PPO was uniform,and the molecular distribution of PPO was narrow.With the increase of PPO content,the dielectric constant vaules of EP composite decreased significantly at different frequencies,and the dielectric loss of EP composite with 15%PPO was reduced to 0.003(2M).EP/PPO system had lower heat release and better smoke suppression effect,and its thermal conductivity were improved.When the content of PPO was 30%,the peak heat release rate and total heat release rate decreased to 518.7 kW/m^(2)and 95.4 MJ/m^(2)respectively,which were 45.3%and 6.2%lower than those of pure EP;The thermal conductivity reached 0.0874 W/(m·K),respectively,and the carbon residue increased from 15.4%to 19.0%;At the same time,the total smoke emission and the total smoke emission rate decreased by 38.6%and 38.7%,respectively,with 25%PPO.The microstructure of EP/PPO composite embritched by the liquid nitrogen was observed by SEM.It indicated that EP and PPO had a good compatibility.Therefore,PPO modified EP will not affect the excellent mechanical properties of EP itself.
作者
李玲玉
单雪影
张濛
张家傅
李锦春
LI Lingyu;SHAN Xueying;ZHANG Meng;ZHANG Jiafu;LI Jinchun(College of Materials Science and Engineering,Chan gzhou Univ ersity,Changzhou,Jiangsu 213164,China;College of Safety Science and Engineering,Changzhou Univ ersity,Changzhou,Jiangsu 213164,China)
出处
《塑料》
CAS
CSCD
北大核心
2024年第6期54-61,共8页
Plastics
基金
2023年江苏省基础研究计划
国家自然科学基金(BK20230642)。
关键词
低分子量聚苯醚
环氧树脂
介电性能
燃烧性能
热性能
low molecular weight polyphenylene oxide
epoxy resin
dielectric property
flame retardant property
thermal performance
