CHEMICAL INTERACTIONS, OPEN POROSITY AND STRENGTH OF SOME MODELED MDFMATERIALS

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 C(4)AF - C(4)A(3)S - hpmc (pva/ac) - poly-P to those of Secar-based mixtures, 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 (Secar-based). (Al,Fe)-O-CR cr oss-links conform to the minimization of the amount and dimensions of pores, as well as affect the evolution of strength during model MDF sy ntheses in the system C(4)AF - C(4)A(3)S - hpmc - poly-P - H. Whisker- like reinforcing role of the cross-links is designed to explain the tr ansfer of the chemical interactions into the level of particles and po res. Strength values indicate a further exploitation of C(4)AF and C(4 )A(3)S - based clinkers; in the MDF forming processes with hpmc and/or poly-P.