The β secondary transition of 4 nitrocellulose-containing gun propellants is investigated by means of dynamic viscoelastic grapher DDV-VIII-EA. It is found that single-base, double-base, nitramine- and nitroguanidine-based propellants all give an corresponding peak of β secondary transition. Compared with single-base propellant, the peak tan β of double-base propellant at its β secondary transition apparently increases, while those of nitramine-based and NGU-based propellants decrease at their β secondary transition. The experimental frequency shows little influence on the tanδ at their β secondary transition. During aging test, the tan β at β secondary transition of nitramine-based propellant is larger than that of NGU-based, and the former decreases rapidly than the later, but after 600hrs, both tan β peaks are nearly closed to each other. The relationship of β secondary transition with impact fracture strength of the gun propellants is briefly discussed.
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罗运军,罗善国,仇武林,等.火炮发射药的β次级转变[J].含能材料, 1999, 7(2):63-66. LUO Yun-jun, Luo Shan-guo, Qiu Wu-ling, et al. β Secondary Transition of Nitrocellulose Containing Gun Propellants[J]. Chinese Journal of Energetic Materials, 1999, 7(2):63-66.