ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 38, (3) 127 - 131 (1994)


CHEMICAL INTERACTIONS, OPEN POROSITY AND STRENGTH OF SOME MODELED MDF MATERIALS
 
Drábik Milan 1, Galikova Lubica 1, Odler Ivan 2
 
1 Institute of Inorganic Chemistry, Slovak Academy of Sciences, 812 36 Bratislava, Slovak Republic
2 Institut fur Nichtmetallische Werkstoffe, T U Clausthal, 3392 Clausthal-Zellerfeld, BRD

In addition to the study of "MDF processability" of various systems there is a strong need for the experimental evidence of the aspects of chemical hypothesis about the origin and properties of MDF materials. We have compared chemical interactions, open porosity and strength of the mixtures C₄AF - C₄A₃S - hpmc (pva/ac) - poly-P to those of Secar-based mirtures, both after MDF procedure. Al and Fe environments are close to cross-links topical in interphase regions of clinker and polymeric parts of the aluminous MDF's (Secarbased). (Al,Fe)-O-CR cross-links conform to the minimization of the amount and dimensions of pores, as well as affect the evolution of strength during model MDF syntheses in the system C₄AF - C₄A₃S - hpmc - poly-P - H. Whisker-like reinforcing role of the cross-links is designed to explain the transfer of the chemical interactions into the level of particles and pores. Strength values indicate a further exploitation of C₄AF and C₄A₃S - based clinkers; in the MDF torming processes with hpmc and/or poly-P.


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