科研之友
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摘要
A new type of polymer-cement composite was developed. Novel components of the starting mixture enable the composite to solidify substantially in the absence of water. The composite is fabricated by combining a resol-type phenol resin precursor, alumina cement and a small amount of additives under high shear mixing to produce a viscoelastic paste using a twin-roll mill. Then, a nearly void-free soft sheet of the mixture is heat-cured at 180 degrees C-200 degrees C for 20 h. All those processes are performed under non-aqueous conditions. The resulting composite shows high flexural strength (%26gt;200 MPa), high water resistance and good thermal stability. The development mechanism of such outstanding material properties of the composite is discussed in relation to non-aqueous processes, phenol moiety, each of the alumina cement components and the additives. Some model reactions, by using model compounds, elucidate the chemical behavior during the manufacturing processes and explain the resulting material properties. These insights were extended to develop a water-resistant polymer-gypsum composite.
- 出版日期2014
