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\ - 2 0 - Cyclodeca Sulphur. ,Recently an olive green solid has been prepared by a slow reaction of ~ s + s Gl in dry ether in the dark (27)._ The 642 molecular weight determination indicated that the reaction product was indeed s10• This observation indicates that new sulphur molecules might be prepared by "directional" reactions, and it can be hoped that such work breaks the barriers of inorganic chemistry which through generations of textbooks led. scientists to believe t~at only s8 could be made at STP. Catena and Polycatena Sulphur. Radiation and heat lead to homolytic S-S bond scission which is followed by polymeriza_tion or ring formation. If a viscous sulphur melt (T > 160°C) is quenched in air, in ice water, in dry_ice, or even in liquid nitrogen, high yields of a plastic material are· ob"t~ined. The plastic solid can be purified by washing with cs and _ 2 it can be stre~ched to long fibres. During the stretching two phases form. The phases can clearly be observed under the microscope (59) and electron microscope (60). This solid, with or without the orthorhombic (o:) inclusions, and before or after stretching, has been widely studied '·and analyzed. For various portions of it the terms polymeric sulphur, ro, 'if!, (/), ~.~-,. fibrous,· plastic, elastic and many other names have been employed. A reproducible method for preparing long fibres has been recently described (59): Sulphur is h~ated for five minutes to 3006C (in a nitrogen atm6sphere) and then poured into ice water in a thin stream. Long fibres· form which are then stretched under ice water. The fibres obtained in this way are highly elastic and can be stretched 10-15 times their length over more than a dozen cycles. .At 23-~5°C ' the fibres can be still elon~ated up to eight times their original length, ! I~ ~ "~ but stretching at 45°C and abo-ve leads to breakage. The stretched fibres ) .·.. - ..J •, r' ,',: ..I I ! .- ' ;, . .!PDF Image | ELEMENTAL SULPHUR
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