Dispersion of chemical and natural materials to produce composites with commercially useful properties.
Ahmed Al-Ani, A. S. (1987). Dispersion of chemical and natural materials to produce composites with commercially useful properties.. (Unpublished Doctoral thesis, The City University)
Abstract
Polymer composites are manufactured for various purposes. Three aspects of dispersion of materials are studied in this work viz:
(1) Dispersion of metals and semi-conducting material to obtain electrically conducting composites.
(2) Dispersion of natural fibres in polymers, cement and ceramic to strengthen the product.
(3) Dispersion of reagents in matrix to increase active shelf life.
Two types of polymer matrix were investigated in the conducting composite studies - thermoplastics (polyethene, polyvinyl chloride, polyvinyl acetate and polystyrene) and thermosetting polymers (phenolic resin - BAKELITE resin R- 17620 and VARCUM 29-112). The conducting materials dispersed in the polymers included: antimony tin oxide, indium tin oxide, carbon black, tin (II) oxide, caesium tin tribromide and tin "suboxide". Attempts were also made to prepare new semiconducting oxide phases. The properties of the final composites are found to be improved by (1) the addition of coupling agents to improve the dispersant-polymer bonds and (2) by blending conducting oxides with inert white filler materials.
The tensile strength and Young's modulus data are obtained for composites of polymers, cement and ceramic when natural fibres are used as strengthening agents. The hair fibre used in this work was in the form of either chopped or powdered hair. It was found that (1) The tensile strengths of the composites increase with increasing the load of the fibre. (2) The Young's moduli of the composites increase with increasing the load of the fibre except that for cement when a decrease in the compressive strength occurs with increasing the load of the fibre. (3) The tensile strengths and the Young's moduli of the polymer composites can be improved by the addition of coupling agents.
It was also found that tin (II) sulphate dispersion in methane sulphonic acid and p-toluene sulphonic acid has a longer shelf life and is simpler to manufacture than tin (II) methane sulphonate or tin (11 )p-toluene sulphonate.
| Publication Type: | Thesis (Doctoral) |
|---|---|
| Subjects: | Q Science > QD Chemistry |
| Departments: | School of Science & Technology School of Science & Technology > School of Science & Technology Doctoral Theses Doctoral Theses |
Download (69MB) | Preview
Export
Downloads
Downloads per month over past year
Metadata
MetadataActions (login required)
Admin Login