High‐Performance Polybenzoxazine Derived from Polyfunctional Benzoxazine Composed of an Oligonuclear Phenolic Compound Having a 4, 4′‐Dimethylenebiphenyl Linker. Issue 1 (20th September 2018)

• Record Type: Journal Article
• Authors: Kawauchi, Takehiro; Osawa, Tsubasa; Matsumura, Shunichiro; Mori, Takuto; Furukawa, Nobuyuki; Ishikawa, Kazunori; Iwasaki, Koju; Takeichi, Tsutomu
• Other Names: Froimowicz Pablo guestEditor.; Zhang Kan guestEditor.; Ran Qichao guestEditor.
• Is Part Of: Macromolecular chemistry and physics. Volume 220:Issue 1(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-09-20
• Subjects: phenolic resins -- polybenzoxazine -- polyfunctional benzoxazine -- ring‐opening polymerization; Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201800317
• Languages: English
• ISSNs: 1022-1352

Abstract

Abstract: A novel polyfunctional benzoxazine monomer, OP‐a, is synthesized from aniline, formaldehyde, and an oligonuclear phenolic compound (OP) with a 4, 4′‐dimethylenebiphenyl group as the phenol linker. After thermal curing ofOP‐a up to 240 °C, a brown‐colored, transparent polybenzoxazine (POP‐a ) film is obtained. The mechanical and thermal properties of thePOP‐a film are investigated by tensile test, dynamic mechanical analysis (DMA), and thermogravimetric analysis (TGA). ThePOP‐a film is extremely tough compared with a typical polybenzoxazine (PB‐a ) film. The elongation at break of thePOP‐a film is 7.6%, which is surprisingly large for the highly cross‐linked thermoset. The high cross‐link density is suggested from the very high storage modulus (over 1 GPa) above the glass transition temperature ( T g ) observed by DMA. The T g ofPOP‐a is also improved significantly to T g = 223 °C, which is approximately 50 °C higher than that ofPB‐a . Moreover, TGA reveals that the thermal stability ofPOP‐a is also enhanced. Abstract : A newly designed polyfunctional benzoxazine is reported to yield a remarkably tough polybenzoxazine film with much improved thermal properties. The monomer is synthesized using an oligonuclear phenolic compound with a 4, 4′‐dimethylenebiphenyl group as the phenol linker, which is commercially available as a curing agent for epoxy resin.