By Norman Brown, Mark F. Parrish (auth.), Adli Bishay (eds.)

ISBN-10: 1461345383

ISBN-13: 9781461345381

ISBN-10: 1461345405

ISBN-13: 9781461345404

It is mostly authorised that. fused BZ03 consists of B0 three triangles. those triangles are joined togetner randomly, forming l the glass community. I.R. experiences and x-ray diffraction experiences on natural BZ03 glass indicated basically that those triangles are joined jointly forming boroxole teams. those teams are joined jointly forming the random community. it's also authorised that addition of alkali oxides to boron oxide leads to a glassy community in \

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Additional resources for Recent Advances in Science and Technology of Materials: Volume 2

Example text

If a little A1203 is added, devitrification of the parent glass can be prevented. 66B203' The copper equilibria were found to be affected only little by the addition of A1203. Amber Glasses It has been demonstrated that the iron-sulphide amber colour arises from a group of one ferric ion surrounded by three oxygens and one sulphide ion. This conclusion followed from studies of the ferrousferric and sulphide-sulphate equilibrium as functions of temperature and oxygen pressure, Brown and Douglas (1965), Douglas and Zaman (1969).

INCORPORATION OF POLAR GROUPS ALONG THE POL'i:mR CHAIN THROUGH COPOLTIiERIZATION A. Copolymers with Methacrylic Acid and with ~~leic Anhydride. Styrene was copolymerized with methacrylic acid, CH3 H ' C=C-COOH H and with maleic anhydride HC = CH ° =C C= 0 ° to incorporate strongly polar acidic or acid anhydride groups along the polymer chain. Di-t-butyl peroxide was used as an initiator giving non-polar end groups and polymerization was carried out in mass, thereby completely eliminating aqueous emulsifier residues.

The effect of chemical structur~ is of interest. Molecules of spherical shape such as neopentane ctc have low polarisability, and the mean range b is greater than forC linear molecules C-C-C-C-C. The mobility is also increased, and a much greater proportion of electrons can escape from their parent ion. On the other hand, unsaturated molecules are more polarisable, and reduce mean range and electron mobility. Thus molecular shape is of considerable importance in defining electrical properties. Length of molecular chain is less relevant.

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Recent Advances in Science and Technology of Materials: Volume 2 by Norman Brown, Mark F. Parrish (auth.), Adli Bishay (eds.)

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