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    徐茜, 袁荞龙, 黄发荣. 炔丙氧基苯基对酚醛型氰酸酯固化反应和性能的影响[J]. 华东理工大学学报(自然科学版), 2020, 46(3): 376-384. DOI: 10.14135/j.cnki.1006-3080.20190321004
    引用本文: 徐茜, 袁荞龙, 黄发荣. 炔丙氧基苯基对酚醛型氰酸酯固化反应和性能的影响[J]. 华东理工大学学报(自然科学版), 2020, 46(3): 376-384. DOI: 10.14135/j.cnki.1006-3080.20190321004
    XU Qian, YUAN Qiaolong, HUANG Farong. Effect of Propargyloxyphenyl Side Groups on the Cure Reaction and Properties of Novolac-Type Cyanate Ester[J]. Journal of East China University of Science and Technology, 2020, 46(3): 376-384. DOI: 10.14135/j.cnki.1006-3080.20190321004
    Citation: XU Qian, YUAN Qiaolong, HUANG Farong. Effect of Propargyloxyphenyl Side Groups on the Cure Reaction and Properties of Novolac-Type Cyanate Ester[J]. Journal of East China University of Science and Technology, 2020, 46(3): 376-384. DOI: 10.14135/j.cnki.1006-3080.20190321004

    炔丙氧基苯基对酚醛型氰酸酯固化反应和性能的影响

    Effect of Propargyloxyphenyl Side Groups on the Cure Reaction and Properties of Novolac-Type Cyanate Ester

    • 摘要: 通过重氮偶合反应在酚醛型氰酸酯(NCE)树脂的一侧接入了炔丙氧基苯基制备了含炔丙氧基苯基的酚醛型氰酸酯(PPANC)树脂,采用1H-NMR、FT-IR和UV-Vis等分析手段对该新型树脂进行了表征,并用热压法制备了石英纤维布增强PPANC树脂复合材料,研究了该树脂体系的固化特性和热稳定性以及复合材料的力学性能和介电性能。结果表明:接入的炔丙氧基苯基对NCE树脂的固化反应有促进作用,固化温度随炔丙氧基苯基接入比例的增加而降低;接入适当比例炔丙氧基苯基的PPANC树脂的力学性能和介电性能均优于NCE树脂,弯曲强度和层间剪切强度分别可达612.2、52.2 MPa左右,玻璃化转变温度高于350 ℃,在1~106 Hz范围内介电常数和介电损耗稳定且低于NCE树脂的相应值,介电常数低于3.6,介电损耗因子低于0.004。

       

      Abstract: p-Propargyloxyphenyl side groups were grafted to the backbone of novolac-type cyanate ester (NCE) by diazo coupling reaction to obtain a new novolac resin (PPANC) with cyanate ester and propargyloxyphenyl side groups. The resins were characterized by 1H-NMR, FT-IR and UV-Vis. The thermal cure reaction of PPANC was studied by differential scanning calorimetry (DSC) and in situ monitoring Fourier-transition infrared. Furthermore, quartz fabrics (QF) reinforced PPANC composites were also molded using hot-press process. The thermal stability of the resins and the mechanical and dielectric properties of the composites were also studied. The results showed that the propargyloxyphenyl side groups in the prepared PPANC could promote the curing reaction of cyanate ester groups attached on NCE as facilitated by the acidic hydrogen of the terminal alkynyl groups. The curing temperature of the NCE resins decreased with the introduction of the propargyloxyphenyl groups, and further decreased with increase of the propargyloxyphenyl content. The thermal stability of the cured PPANC resins in nitrogen decreased with increase of the propargyloxyphenyl content. However, the temperature at 5% mass loss of the cured PPANC resins retained higher than 400 °C. The PPANC resin with a moderate propargyloxyphenyl content was reinforced by QF to form the composite which showed higher mechanical properties and lower dielectric properties than those of the composites of NCE and PPANC matrices. The flexural strength and modulus, and interlayer shear strength (SILS) of the QF/PPANC composite could reach about 612 MPa, 26 GPa and 52 MPa, respectively. The glass transition temperature of the QF/PPANC composites and QF/NCE composite were higher than 350 ℃. The dielectric constant and dissipation of the QF/PPANC composites were lower than 3.6 and 0.004, respectively. These values are lower than those of the QF/NCE composite in the frequency range of 1~106 Hz.

       

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