Random copolymer membrane coated PBO fibers with significantly improved interfacial adhesion for PBO fibers/cyanate ester composites
| Autor: | Lin Tang, Junwei Gu, Junliang Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0209 industrial biotechnology
Materials science Dispersity Aerospace Engineering 02 engineering and technology 01 natural sciences 010305 fluids & plasmas Interfacial adhesion chemistry.chemical_compound 020901 industrial engineering & automation Cyanate ester Benzocyclobutene 0103 physical sciences Ultimate tensile strength Copolymer Bisphenol A cyanate (BADCy) resins Composite material Motor vehicles. Aeronautics. Astronautics chemistry.chemical_classification RAFT polymerization Mechanical Engineering Membrane PBO fibers TL1-4050 Polymer chemistry Polymerization Surface modification |
| Zdroj: | Chinese Journal of Aeronautics, Vol 34, Iss 2, Pp 659-668 (2021) |
| ISSN: | 1000-9361 |
| Popis: | Poly(p-phenylene-2,6-benzobisoxazole) (PBO) fibers possess excellent dielectric, mechanical properties and heat resistance. However, the surface of PBO fibers is smooth and highly chemical inert, resulting in poor interfacial compatibility to polymer matrix, which severely limits its wider application in high-performance fiber-reinforced resin matrix composites. In this work, random copolymers (P(S-co-BCB-co-MMA)) containing benzocyclobutene in the side-chain were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization, which were then utilized to form dense random copolymer membrane on the surface of PBO fibers by thermally cross-linking at 250 °C (PBO@P fibers). Four kinds of synthesized P(S-co-BCB-co-MMA) with different number-average molar mass (Mn) were well controlled and possessed narrow dispersity. When the Mn was 32300, the surface roughness of PBO@P fibers was increased from 11 nm (PBO fibers) to 39 nm. In addition, PBO@P fibers presented the optimal interfacial compatibility with bisphenol A cyanate (BADCy) resins. And the single fiber pull-out strength of PBO@P fibers/BADCy micro-composites was 4.5 MPa, increasing by 45.2% in comparison with that of PBO fibers/BADCy micro-composites (3.1 MPa). Meantime, PBO@P fibers still retained excellent tensile strength (about 5.1 GPa). Overall, this work illustrates a simple and efficient surface functionalization method, which would provide a strong theoretical basis and technical support for controlling the surface structure & chemistry of inert substrates. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|