Zheng Liu, Xiaoli Fan, Lei Cheng, Junliang Zhang*, Lin Tang, Yusheng Tang, Jie Kong and Junwei Gu*. Hybrid polymer membrane functionalized PBO fibers/cyanate esters wave-transparent laminated composites. Advanced Fiber Materials, 2022, 10.1007/s42765-021-00125-4. 2021即時(shí)因子10.458（中國(guó)科技期刊卓越行動(dòng)計(jì)劃高起點(diǎn)新刊）
https://doi.org/10.1007/s42765-021-00125-4
Abstract
Hybrid polymer membrane (TA-APTES), synthesized by tannic acid (TA) and aminopropyl trethoxysilane (APTES) based on the Schiff’s base and Michael addition reaction, is deposited on the surface of poly(p-phenylene-2, 6-benzobisoxazole) (PBO) fibers, and then grafted with epoxy-terminated polysesquisiloxane (POSS) to obtain POSS-g-PBO@TA-APTES fibers. The POSS-g-PBO@TA-APTES fibers reinforced bisphenol A dicyanate ester (BADCy) resins (POSS-g-PBO@TA-APTES fibers/BADCy) wave-transparent laminated composites are prepared. The interlaminar shear strength and flexural strength of POSS-g-PBO@TA-APTES fibers/BADCy composites are respectively enhanced from 36.7 and 587.4 MPa to 42.8 and 645.8 MPa, increased by 16.6% and 9.9% compared with those of PBO fibers/BADCy composites. At 1 MHz, the corresponding dielectric constant and dielectric loss are reduced to 2.85 and 0.0047, respectively, lower than those of PBO fibers/BADCy (3.06 and 0.006) composites. Meanwhile, the simulated wave transmittance rate of POSS-g-PBO@TA-APTES fibers/BADCy composites with the thicknesses of 1.5~3.5 mm is higher than 86.2% at 0.3~40 GHz. The volume resistivity and breakdown strength of POSS-g-PBO@TA-APTES fibers/BADCy composites are 2.8×1015 Ω?cm and 19.80 kV/mm, higher than PBO fibers/BADCy composites (2.2×1015 Ω?cm and 17.69 kV/mm), respectively. And the corresponding heat resistant index is 221.5oC, lower than PBO fibers/BADCy composites (229.6oC).
本文基于單寧酸（TA）氧化物與3-氨基丙基三乙氧基硅烷（APTES）的席夫堿和邁克爾加成反應(yīng)，采用原位共沉積在聚對(duì)苯撐苯并二噁唑（PBO）纖維表面構(gòu)筑聚合物膜（PBO@TA-APTES），經(jīng)接枝聚倍半硅氧烷（POSS）得到POSS-g-PBO@TA-APTES纖維。再將POSS-g-PBO@TA-APTES纖維與雙酚A型氰酸酯（BADCy）樹脂復(fù)合，經(jīng)浸膠-纏繞-高溫模壓制備POSS-g-PBO@TA-APTES纖維/BADCy層壓透波復(fù)合材料。結(jié)果表明，TA-APTES膜和POSS實(shí)現(xiàn)了對(duì)PBO纖維表面的協(xié)同功能化修飾。POSS-g-PBO@TA-APTES纖維/BADCy層壓透波復(fù)合材料的層間剪切強(qiáng)度（ILSS）和彎曲強(qiáng)度分別為42.8 MPa和645.8 MPa，較未改性PBO纖維/BADCy層壓透波復(fù)合材料（ILSS和彎曲強(qiáng)度分別為36.7 MPa和587.4 MPa）分別提升了16.6%和9.9%。1 MHz下的介電常數(shù)和介電損耗角正切值分別降低至2.85和0.0047，對(duì)應(yīng)1.5~3.5 mm厚的層壓透波復(fù)合材料在0.3~40 GHz均具備優(yōu)異的透波性能（仿真透波率均大于86.2%）。POSS-g-PBO@TA-APTES纖維/BADCy層壓透波復(fù)合材料的體積電阻率、擊穿電壓分別為2.8×1015 Ω?cm和19.80 kV/mm，同樣優(yōu)于PBO纖維/BADCy的2.2×1015 Ω?cm和17.69 kV/mm。相應(yīng)的耐熱指數(shù)為221.5oC，低于PBO纖維/BADCy層壓復(fù)合材料的229.6oC。