Fabrication of novel wave-transparent HMPBO fibre/BADCy laminated composites

Abstract

The method of "impregnation-winding-lamination-mould pressing" was performed to fabricate novel wave-transparent high modulus poly(p-phenylene-2,6-benzobisoxazole) fibre/bisphenol A cyanate ester resin (HMPBO fibre/BADCy) laminated composites. The "two-step approach" of methanesulfonic acid/gglycidoxy propyl trimethoxy silane (MSA/KH-560) was also proposed to functionalize the HMPBO fibres'surface. Results revealed that KH-560 was grafted on the HMPBO fibres' surface successfully. The functionalized HMPBO fibre/BADCy laminated composites possessed better ILSS & flexural strength, lower 3 & tan d, and higher heat-resistance index & T g . The ILSS and flexural strength of the functionalized HMPBO/BADCy laminated composites were increased to 53.7 MPa and 753.7 MPa, respectively. The corresponding 3 and tan d were decreased to 2.93 and 0.00097, respectively. The corresponding heat-resistance index and T g were increased to 219 C and 236 C, respectively. The functionalized HMPBO fibre/BADCy laminated composites display potential application in radomes and the antenna systems of aircrafts.

Low‐viscosity and soluble phthalonitrile resin with improved thermostability for organic wave‐transparent composites

“…The laminates exhibited a dielectric constant of 2.94–3.27 and tan δ of 0.002–0.019 in an electromagnetic field at frequency ranging from 8 GHz to 18 GHz, values similar to that of many organic wave‐transparent materials that have been reported . The low polarizability of the CF/CH bonds and the absence of strong dipoles led to an obvious decrease of dielectric constant . Meanwhile, with the introduction of trifluoromethyl groups, the surface of the laminates manifested a hydrophobic phenomenon that was advantageous for the maintenance of a low dielectric constant .…”

Rheological and mechanical properties of polyphenylene sulfide reinforced with round and rectangle cross-section glass fibers

“…The mechanical properties of glass fiber-reinforced composites were mainly determined by fiber content, residual fiber length, fiber orientation, void fraction, matrix properties (mainly PPS crystallinity in this case), and interfacial adhesion. [2][3][4][5][6][7][8][9][10] The residual fiber length was measured, as discussed in ''Fiber morphology and rheological properties'' section and shown in Table 1. The longer residual fiber of RcGF would definitely result in higher reinforcing efficiency.…”

“…Fiber (such as traditional glass fiber, carbon fiber, and novel high modulus poly(p-phenylene-2,6-benzobisoxazole) (HMPBO) fiber) reinforced polymer composites have received considerable attention owing to their comprehensive merits and profound industrial applications. [1][2][3][4][5][6] According to the abundant previous works, the mechanical properties of the composites were mainly determined by the fiber content, fiber length, fiber orientation, and interfacial adhesion between the fiber and the matrix. [7][8][9][10] Among these factors, fiber content and length were critical on enhancing the mechanical properties of a given system.…”

Design and multibody dynamics analyses of the novel force-bearing structures for variable configuration spacecraft

“…Bismaleimide (BMI) resins possess excellent mechanical properties, outstanding thermal stabilities, good radiation resistances, and attractive cost-to-performance ratio [11][12][13][14][15]. Poly(p-phenylene-2, 6-benzobisoxazole) (PBO) fibers possess light weight, outstanding specific tensile strength, excellent thermal stability, and good flame resistance [16][17][18][19]. Therefore, it is rational to predict that the PBO/BMI composites will find extensive applications as force-bearing structural composites in the next generation of VCS [20,21].…”