Development of a novel, ultra-performance polymer cement: In situ formation of benzoxazine monomer and subsequent formation of polybenzoxazine/cement composites

• Published in: Polymer composites 2010-12, Vol.31 (12), p.1995-2006
• Main Authors: Ishida, Hatsuo, McCoy, Michelle, Bando, Takamasa, Hatta, Hiroshi
• Format: Article
• Language: English
• Subjects: Application fields; Applied sciences; Benzoxazines; Buildings. Public works; Cements; Exact sciences and technology; Materials; Miscellaneous (including polymer concrete, repair and maintenance products, etc.); Monomers; Particulate composites; Polybenzoxazines; Polymer cements; Polymer industry, paints, wood; Polymer matrix composites; Technology of polymers
• ISSN: 0272-8397; 1548-0569
• DOI: 10.1002/pc.20991

The feasibility of making a high strength, water resistant polymer cement with 6,6′‐bis(2,3‐dihydro‐3‐methyl‐4H‐1,3‐benzoxazinyl) isopropylidiene (bisphenol‐A) and methylamine‐based benzoxazine, is examined. The polymer cement composites are made by room temperature combination of monomer precursors, solvent, and alumina cement. The subsequent monomer formation, in both the presence and absence of cement, is measured with respect to time by 1H nuclear magnetic resonance spectroscopic analysis (NMR) of the reaction products. The addition of high alumina cement to the monomer precursors results in accelerated benzoxazine monomer formation at room temperature. The mechanism of monomer formation is discussed. Decreased polymerization temperature of the benzoxazine monomer in the presence of cement is studied by thermal analysis. Solvent is found to have little to no effect on the monomer formation and cure. A compressive strength as high as 250 MPa and a 90 day room temperature water absorption of less than 3% is achieved with no further addition of modifiers. POLYM. COMPOS., 2010. © 2010 Society of Plastics Engineers