Abstract
More attention has been given recently to the synthesis of polycarbamides (PCA) from cheap and easily obtained raw materials, i.e. the carbamides which are being used in synthetic fibre production. The linear PCA of type -[-RNHOONH-]- have been known for quite a long time, but they were thought not to be of much use because of their low heat resistance; the difficulties of producing polymers free from secondary products were another reason for not using them [1–3]. The PCA based on aliphatic diamines and carbamide were the main centre of attention; it was noticed that a longer hydrocarbon radical improved the fibre-forming properties of the polymer and the mechanical strength of the fibre. We therefore thought it worthwhile to produce PCA from dodecamethylenediamine (DMD), i.e. one of the aliphatic diamines with a fairly long radical, by polycondensing it with carbamide and with dodecylene dicarbamide (DDCA).
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