Morphological Changes of Bis [4-(3-decylureido) phenyl] methane from Crystals to Tubulous aggregates by Heat in Paraffinic Mineral Oil-An Influenc e of Pulverization of the Crystals on the Forming the Tubulous aggregates

Abstract

Tubulous aggregates were partially formed when bis[4-(3-decylureido)phenyl]methane (DUDM) crystals were heated in paraffinic mineral oil (PMO) at 160 °C for 2 h. Pulverizing the crystals before heating increased the amount of the tubulous aggregates. As the pulverization proceeded, the initial plate-like crystals(C) turned to granular shape, and the surface area changed from 6.9(C) to 10.1 (stage C-1) and finally to 7.9 m2/g (stage C-2). Lowering fo crystallinity for the C-2 was observed in XRD patterns. Considering the two factors (surface area, crystallinity), p ulverization would make easier to insert the PMO into two kinds of inter-layers in crystals, and to form tape-like aggregates which change helically into tubulous aggregates.