SynopsisThe effect of prevulcanisation on the processing properties and network structure of a series of latex compounds containing conventional and efficient vulcanisation (E.V. systems) systems for the manufacture of latex thread was evaluated. Prevulcanisation was effected at 70°C and the extent of crosslinks formed and compound viscosity at various periods of heating were studied. It is observed that the vulcanisation systems studied have a profound effect on the extent of crosslink formation during prevulcanisation. The network structure of the vulcanisate was also studied and found that polysulphidic content is high as the extent of prevulcanisation of the latex compound increases. Latex threads were also prepared from typical latex compounds which were prevulcanised to different degrees and their chemical and physical properties were evaluated. It is observed that the extent of prevulcanisation affects the aged and unaged physical properties of latex threads.
This paper evaluated the performance and durability of leading structural shading materials to be used in the Super Containerized Living Units (Super-CLU’s) project. Fifteen unique shading fabrics were tested in five different experiments in order to evaluate their strength, resistance to wind, abrasion, and heat and to assess their heat transmissivity and breathability. A current United States Navy material was used as a control material for the evaluation of the other tested materials. Samples of each fabric were first tensile tested in both their warp and weft orientation to create an ‘as-received’ baseline condition. Then, additional samples of each fabric were exposed to wind, abrasion, or heat and subsequently tensile tested in order to show the degradation in tensile strength as compared to the as-received samples. The heat transmissivity and breathability testing was conducted separately.
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