Jiani Zhang, Zheng Liu, Muyi Han, Junliang Zhang, Yusheng Tang* and Junwei Gu*. Block copolymer functionalized quartz fibers/cyanate ester wave-transparent laminated composites. Journal of Materials Science & Technology, 2023, 139: 189-197. 2021IF=10.319.（1区材料科学Top期刊，中国科技期刊卓越行动计划-重点类期刊项目）

https://doi.org/10.1016/j.jmst.2022.09.005

Abstract

A block copolymer of PDMS-b-PGMA is synthesized by polymerizing glycidyl methacrylate (GMA) via reversible addition-fragmentation chain transfer (RAFT) polymerization applying a polydimethylsiloxane (PDMS) based macro-RAFT agent, which is then performed to functionlize the quartz fibers (QFs@PDMS-b-PGMA) via a simple coating process. Finally, the QFs@PDMS-b-PGMA/bisphenol A dicyanate ester (BADCy) wave-transparent laminated composites are fabricated by high-temperature molding. Nuclear magnetic resonance (NMR) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy and size exclusion chromatography (SEC) demonstrate the successful preparation of PDMS-b-PGMA with expected structure. When the molar mass and coating amount of PDMS-b-PGMA is respectively 8100 g/mol and 2.0 wt%, QFs@PDMS-b-PGMA/BADCy wave-transparent laminated composites present the optimal mechanical properties and wave-transparent performance. The interlaminar shear strength (ILSS) and flexural strength are 53.6 MPa and 552.0 MPa, respectively. Meanwhile, the dielectric constant and dielectric loss values are 2.61 and 0.0028 at 1 MHz (wave transmittance of 93.8%), showing good stability at different frequencies (102 ~ 106 Hz and 8.4 ~ 12.4 GHz) and temperatures (25 ~ 250^oC).

本文以单羟基封端的聚二甲基硅氧烷（PDMS）和甲基丙烯酸缩水甘油酯（GMA）为原料，采用可逆加成-断裂链转移（RAFT）聚合制备的嵌段聚合物（PDMS-b-PGMA）涂覆改性石英纤维（QFs@PDMS-b-PGMA），再与双酚A型氰酸酯（BADCy）树脂复合，经高温模压制备QFs@PDMS-b-PGMA/BADCy层压透波复合材料。核磁共振氢谱（1H NMR）、傅里叶红外光谱（FT-IR）和体积排阻色谱（SEC）证明成功制备出具有预期分子结构的PDMS-b-PGMA。当PDMS-b-PGMA分子量为8100且在QFs表面的包覆量为2.0 wt%时，QFs@PDMS-b-PGMA/BADCy层压透波复合材料具有最佳的力学性能和透波性能。层间剪切强度和弯曲强度分别为53.6 MPa和552.0 MPa，较纯QFs/BADCy层压透波复合材料（45.3 MPa和466.4 MPa）分别提升了18.3%和18.4%；1 MHz下的介电常数和介电损耗角正切值分别为2.61和0.0028（对应透波率为93.8%），均低于纯QFs/BADCy层压透波复合材料（3.17和0.0074，对应透波率为90.5%），且在不同频率（102~106 Hz和8.4~12.4 GHz）及温度（25~250^oC）范围内均具有良好的稳定性。

本文亮点

1. 采用可逆加成-断裂链转移（RAFT）聚合得到的两亲性嵌段聚合物对石英纤维（QFs）进行表面功能化改性（QFs@PDMS-b-PGMA），实现了QFs@PDMS-b-PGMA/双酚A型氰酸酯（BADCy）层压透波复合材料力学性能和透波性能的同步提升。

2.当PDMS-b-PGMA的分子量为8100且在QFs表面包覆量为2.0 wt%时，QFs@PDMS-b-PGMA/BADCy层压透波复合材料的层间剪切强度（ILSS）和弯曲强度最大，分别为53.6 MPa和552.0 MPa，较纯QFs/BADCy（45.3 MPa和466.4 MPa）分别提高了18.3%和18.4%。

3. 当PDMS-b-PGMA的分子量为8100且在QFs表面包覆量为2.0 wt%时，QFs@PDMS-b-PGMA/BADCy层压透波复合材料1 MHz下的介电常数和介电损耗正切值分别为2.61和0.0028（对应透波率为93.8%），且在不同频率（102~106Hz和8.4~12.4 GHz）及温度（25~250^oC）范围内均具有良好的稳定性。

第一作者：张佳妮

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