𝔖 Bobbio Scriptorium
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Network degradation accompanying the vulcanization of natural rubber with a sulfur–diphenylguanidine system

✍ Scribed by Kenneth W. Scott; Otto Lorenz; Carl R. Parks

Book ID
102736084
Publisher
John Wiley and Sons
Year
1964
Tongue
English
Weight
740 KB
Volume
8
Category
Article
ISSN
0021-8995

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✦ Synopsis

Sol fraction and swelling values have been determined for a series of natural rubbersulfur-diphenylguanidine vulcanizates. These data have been analyzed in terms of the Charlesby and Pinner gel network formation theory with a view to estimating the amount of permanent molecular chain scission accompanying the vulcanization. It is concluded that negligible chain scission occurs before the point of modulus revelaion of these curves. In the region of cure reversion, permanent molecular chain scission does occur to a small extent. The principal factor responsible for cure reversion in this vulcanizate is crosslink scission. Chain scission is responsible for only about 3-8% of the observed cure reversion.

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