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區材料科學Top期刊，中國科技期刊卓越行動計劃-重點類期刊項目）
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 ~ 250oC).
本文以單羥基封端的聚二甲基硅氧烷（PDMS）和甲基丙烯酸縮水甘油酯（GMA）為原料，采用可逆加成-斷裂鏈轉移（RAFT）聚合制備的嵌段聚合物（PDMS-b-PGMA）涂覆改性石英纖維（QFs@PDMS-b-PGMA），再與雙酚A型氰酸酯（BADCy）樹脂復合，經高溫模壓制備QFs@PDMS-b-PGMA/BADCy層壓透波復合材料。核磁共振氫譜（1H NMR）、傅里葉紅外光譜（FT-IR）和體積排阻色譜（SEC）證明成功制備出具有預期分子結構的PDMS-b-PGMA。當PDMS-b-PGMA分子量為8100且在QFs表面的包覆量為2.0 wt%時，QFs@PDMS-b-PGMA/BADCy層壓透波復合材料具有最佳的力學性能和透波性能。層間剪切強度和彎曲強度分別為53.6 MPa和552.0 MPa，較純QFs/BADCy層壓透波復合材料（45.3 MPa和466.4 MPa）分別提升了18.3%和18.4%；1 MHz下的介電常數和介電損耗角正切值分別為2.61和0.0028（對應透波率為93.8%），均低于純QFs/BADCy層壓透波復合材料（3.17和0.0074，對應透波率為90.5%），且在不同頻率（102~106 Hz和8.4~12.4 GHz）及溫度（25~250oC）范圍內均具有良好的穩定性。
本文亮點
1. 采用可逆加成-斷裂鏈轉移（RAFT）聚合得到的兩親性嵌段聚合物對石英纖維（QFs）進行表面功能化改性（QFs@PDMS-b-PGMA），實現了QFs@PDMS-b-PGMA/雙酚A型氰酸酯（BADCy）層壓透波復合材料力學性能和透波性能的同步提升。
2.當PDMS-b-PGMA的分子量為8100且在QFs表面包覆量為2.0 wt%時，QFs@PDMS-b-PGMA/BADCy層壓透波復合材料的層間剪切強度（ILSS）和彎曲強度最大，分別為53.6 MPa和552.0 MPa，較純QFs/BADCy（45.3 MPa和466.4 MPa）分別提高了18.3%和18.4%。
3. 當PDMS-b-PGMA的分子量為8100且在QFs表面包覆量為2.0 wt%時，QFs@PDMS-b-PGMA/BADCy層壓透波復合材料1 MHz下的介電常數和介電損耗正切值分別為2.61和0.0028（對應透波率為93.8%），且在不同頻率（102~106Hz和8.4~12.4 GHz）及溫度（25~250oC）范圍內均具有良好的穩定性。
第一作者：張佳妮
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