Effect of carborane groups and the structure of their surrounding organic residues on the reactivity of monomers and properties of polymers

Abstract

The present work considers (4+1)-dimensional spatially homogeneous vacuum cosmological models. Exact solutions-some already existing in the literature, and others believed to be new-are exhibited. Some of them are the most general for the corresponding Lie group with which each homogeneous slice is endowed, and some others are quite general. The characterization 'general' is given based on the counting of the essential constants, the line element of each model must contain; indeed, this is the basic contribution of the work. We give two different ways of calculating the number of essential constants for the simply transitive spatially homogeneous (4+1)-dimensional models. The first uses the initial value theorem; the second uses, through Peano's theorem, the so-called time-dependent automorphism inducing diffeomorphisms.

Synthesis and characterization of carborane‐containing polyester with excellent thermal and ultrahigh char yield

“…The organic layer was washed with deionized water and brine three times, respectively, and dry over anhydrous MgSO 4 . The solvent was removed under vacuum and the solid residue was recrystallized several times from ethylene dichloride to give a colorless crystal solid 3 with 80% yield …”

“…The solvent was removed under vacuum and the solid residue was recrystallized several times from ethylene dichloride to give a colorless crystal solid 3 with 80% yield. 38,40 ANAL. Calcd for FTIR (m, cm 21 Synthesis of C,C 0 -1,7-Carboranyl-bis-Carboxylic Acid Chloride (4).…”

“…Carborane groups also can be introduced into polyesters to improve the thermal stability of the polyesters. Decades ago, several research groups have prepared the carborane‐containing polyester with different molecular weight . However, few research works about carborane‐containing polyester have been reported in recent years.…”

“…Decades ago, several research groups have prepared the carborane-containing polyester with different molecular weight. 24,[35][36][37][38] However, few research works about carborane-containing polyester have been reported in recent years. Due to the big steric hindrance and stereostructure of the carborane, the preparation of polyesters containing carborane required tough experiment condition such as high temperature, especially when the monomers all contain carborane groups.…”

High-yielding and facile synthesis of organosilicon compounds containing a m-carboranylmethyl group

“…5 An increase in the number of methylene groups reduces the resistance to degradation. 5 An increase in the number of methylene groups reduces the resistance to degradation.…”