The book The Chemistry of Rubber was written by author B D Benjamin Dawson Porritt Here you can read free online of The Chemistry of Rubber book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Chemistry of Rubber a good or bad book?
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Recent experiments support Weber's statement of the formation of the disulphide C 10 H 16 S 2 . Spence and Young, 142 working with a mixture of Para and THEORIES OF VULCANISATION 57 sulphur (37 per cent. ), found that at 135 the combined sulphur reached a limit of 31'97 per cent, in twenty hours and did not increase with ten hours' further heating. The margin of uncombined sulphur (3 '80 per cent. ) is perhaps rather narrow, and Wo. Ostwald points out that in a more rigorous investi- gation he ...would use 60 per cent, or more of initial sulphur. More recently still a substance of the same empirical composition has been found to be the uniform result of the action of sulphur, in varying excess, on caoutchouc in cumol solution at 170 . * 90 The relative amount of sulphur was more than twice as high as that employed by Spence and Young. In no case did the product contain more than 32 per cent, of combined sulphur. An additional argument for the disulphide is furnished by the results of brornination experiments.
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