Diacetyl hexamethylene-diamine, a new chain extender, was prepared with hexamethylene-diamine, acetic acid and phosphoric for decreasing reaction activity of synthesizing polyurea. Micro-kjeldahl method, FTIR and ~1H-NMR were employed to characterize chemical structure of the synthetic product. Polyureas were synthesized using 4,4′-diphenyl diisocyanate and amine terminated poly (oxypropylene) with two different chain extenders. The gel time is prolonged, that is, the reaction activity is decreased when diacetyl hexamethylene-diamine is used as chain extender instead of hexamethylene-diamine. The kinetics of curing of polyurea reaction was studied by FTIR. The results show that the reaction belongs to the second-order reaction.
LIU Zong-yu
,
SONG Wei
,
HAO Jing-mei
,
DENG Yu
. N-acetylating Hexamethylene-diamine Curing Reaction Kinetics[J]. Journal of Hebei University(Natural Science Edition), 2010
, 30(2)
: 171
-175
.
DOI: 10.3969/j.issn.1000-1565.2010.02.013
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