Comparison of the Applications of DSC and Rheology Methods in Determining the Curing Kinetics Parameters of HTPB-Based PBX Simulants

doi:10.12382/bgxb.2023.0786

Abstract

Abstract:

In order to optimize the preparation process of polymer bonded explosive (PBX) and deeply understand its performance, and explore the best method suitable for studying the curing kinetics of PBX, the curing reaction kinetics of HTPB/TDI/Na₂SO₄/Al system are thoroughly investigated using non-isothermal differential scanning calorimetry (DSC) method, rheological isothermal method, and rheological non-isothermal method. The curing reaction kinetic equations are obtained under these three test conditions, and the widely used non-isothermal rheological method is optimized. The results show that The curing reaction between HTPB and TDI follows an autocatalytic model, and the activation energies of curing reaction obtained using Kissinger and Ozawa methods are similar, with a difference of no more than 3% between the two. The thermostatic curing of PBX surrogate system exhibits an onset temperature of 423.29K, a peak temperature of 440.23K, and a final temperature of 444.49K. The effect of temperature on the energy storage modulus needs to be considered in the rheological study of curing kinetics. The measured values cannot be used solely to characterize the degree of curing, and the data need to be corrected. DSC method and rheological method have their own advantages and disadvantages: if the objective is to obtain only the parameters of curing kinetics, the DSC method is a better choice. However, the rheological method must be used to understand the internal structure of slurry in the curing process.

Key words: polymer bonded explosive, differential scanning calorimetry method, rheology method, curing reaction kinetics

CLC Number:

TJ55
TQ560.1

WANG Hong, WANG Tianxiang, YIN Yanhua. Comparison of the Applications of DSC and Rheology Methods in Determining the Curing Kinetics Parameters of HTPB-Based PBX Simulants[J]. Acta Armamentarii, 2024, 45(10): 3596-3607.

Figures/Tables 30

References 23

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药品	规格与性质	生产厂家
HTPB	Ⅲ型	天元军融化工有限公司
铝粉	工业级	鞍钢实业微细铝粉有限公司
无水硫酸钠(Na₂SO₄)	工业级	四川同庆南风责任有限公司
TDI	化学纯	太仓沪试试剂有限公司

药品	规格与性质	生产厂家
HTPB	Ⅲ型	天元军融化工有限公司
铝粉	工业级	鞍钢实业微细铝粉有限公司
无水硫酸钠(Na₂SO₄)	工业级	四川同庆南风责任有限公司
TDI	化学纯	太仓沪试试剂有限公司

设备名称	生产厂家
电子天平	上海卓精电子科技有限公司
HAAKE RS300旋转流变仪	赛默飞世尔科技公司
DSC-60差示扫描量热仪	岛津企业管理(中国)有限公司

设备名称	生产厂家
电子天平	上海卓精电子科技有限公司
HAAKE RS300旋转流变仪	赛默飞世尔科技公司
DSC-60差示扫描量热仪	岛津企业管理(中国)有限公司

测试方法	药品质量/mg	升温速率/ (℃·min^-1)	温度范围/℃	平板直径/mm	板间隙/ mm	测试频率/rad	测试条件
DSC法	6	3,5,7,9	30~300				铝制坩埚,氮气氛围
流变学等温法			60,70,80,90	25	1.5	20
流变学非等温法		3,5,7,9	30~300	25	1.5