Detail of "3229-00-3"

Reference

Eutectic solidification of the quasi binary system of isotactic polypropylene and pentaerythrityl tetrabromide

Eutectic solidification of the quasi binary system of isotactic polypropylene and pentaerythrityl tetrabromide. Smith, P.; Pennings, A. J. (Dep. Polym. Chem., State Univ. Groningen, Groningen, Neth.). J. Polym. Sci., Polym. Phys. Ed., 15(3), 523-40 (English) 1977. CODEN: JPLPAY. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) The title eutectic solidification was studied to gain some understanding of the simultaneous crystn. of a polymer and a diluent with a metal-like character.Several reagents with their cas registry numbers 3229-00-3 and 25085-53-4 are used here. Pentaerythrityl tetrabromide (I) [3229-00-3] had a melting range of 157-9.degree., appropriate for the occurrence of a eutectic point. Despite the fact that the value of .alpha. = 6 of I was rather high, in polymer solns. I produced dendrites upon solidification, typical of metallic behavior, and I was classified as pseudodendritic. Considering the metal-like habit of both components, it was expected that the eutectic solidification process would proceed in a cooperative way, forming regular structures which should depend on the growth rate. In controlled solidification of the I-isotactic polypropylene (II) [25085-53-4] eutectic, coupled growth of the I and II mols. was obsd. at growth rates <3 mm/h. The formed eutectic microstructure consisted of I rods dispersed in a II matrix. The lateral dimension of these rods depended on the rate of solidification and ranged from 0.3 to 1.0 .mu.m. At growth rates <3 mm/h, uncoupled growth of I and II was obsd., producing a structure of randomly mixed II spherulites and I crystals. In the solidification of off-eutectic solns. with an excess of I, a remarkable nucleating effect of the primary I crystals was found. This indicated the importance of eutectics in polymeric systems, which could be applied in dispersing cryst. additives such as nucleating agents or in the in situ prodn. of polymer composites. Also, solidification of eutectic polymer-diluent systems provided a method for producing porous materials by removal of the small mol. compd., where the lateral dimensions of the pores depended on the growth rate. .

Synthesis and X-ray crystal structure of a bridging trispiran ligand

Synthesis and X-ray crystal structure of a bridging trispiran ligand. Steel, Peter J.; Sumby, Christopher J.Chemicals with cas numbers 3229-00-3 and 50890-67-0 also play role. (Department of Chemistry, University of Canterbury, Christchurch, N. Z.). ARKIVOC (Gainesville, FL, United States), (10), 7-12 (English) 2004 Arkat USA Inc. URL: http://www.arkat-usa.org/ark/journal/2004/Rickards/RI-1057C/1057C.p df. CODEN: AGFUAR. DOCUMENT TYPE: Journal; (online computer file) CA Section: 28 (Heterocyclic Compounds (More Than One Hetero Atom)) Spiro[3,3]heptane-2,6-dispiro-4,5-diazafluorene has been synthesized in three steps from 1,10-phenanthroline. It crystallizes in the orthorhombic space group P212121 and has the two 4,5-diazafluorene metal binding domains mutually orthogonal. .