121st General Meeting of the KCS

Type Poster Presentation
Area Polymer Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code POLY.P-45
Subject A synergy between ultrasonication and polymer matrix in reducing the particle size of molecular explosive during crystallization
Authors LEE JUMI, Kuktae Kwon1, EUNJI LEE2, Kwanwoo Shin3,*
Chemistry, Sogang University, Korea
1Agency for Defense Development, Korea
2Department of Analytical Science and Technology, Chungnam National University, Korea
3Department of Chemistry, Sogang University, Korea
Abstract In the field of explosives, acquisition of smaller crystal particles has been demanded for reducing sensitivity to unintended initiation by mechanical stimuli. Among various methods to produce smaller particles, crystallization of molecular explosive inside a polymer matrix is advantageous because the matrix induces heterogeneous nucleation, which generates smaller particles and, in addition, absorbs accidentally incident mechanical energy, suppressing its transfer to embedded explosive. In this paper, we crystallize 1,3,5-Trinitro-1,3,5-triazinane (RDX), one of the most extensively used explosive, inside the polymer matrix by quenching while simultaneously applying ultrasound. We find that resulting particles are ~ 30 nm, which is three orders of magnitude smaller than those produced either by the identical method except ultrasonication or by quenching with ultrasonication outside the polymer matrix. We infer that there is a synergy between the polymer matrix and ultrasonication in reducing the particle size during crystallization, which arises because the polymer matrix induces both heterogeneous nucleation and premature implosion of cavitation bubbles. In other words, the polymer matrix amplifies the effects of ultrasonication on expediting nucleation of RDX.
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