摘要
为改善AP的吸湿性和热分解性能,基于多巴胺氧化自聚合原理,采用原位包覆法将聚多巴胺(PDA)包覆于AP表面,然后利用PDA的强黏附性,使纳米Fe_(2)O_(3)均匀吸附于AP/PDA复合物表面,获得了AP/PDA/Fe_(2)O_(3)复合物;利用粒度分析仪、扫描电镜-能谱仪(SEM-EDS)、X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)等分析了改性前后AP粒度、形貌及表面元素组成;采用增重法和接触角测试对改性前后AP的吸湿性能进行了测试,并采用差示扫描量热法(DSC)对改性前后AP的热分解性能进行研究。结果表明,PDA能均匀沉积于AP表面,包覆效果较好,且包覆前后粒度基本没有变化;加入纳米Fe_(2)O_(3)能均匀附着在AP/PDA的表面;AP/PDA/Fe_(2)O_(3)复合物的吸湿率为0.16%,接触角达到41.8°;与AP相比,该复合物的高温分解峰温提前了48.5℃,放热量提高1倍,表观活化能由209.5kJ/mol降至128.8kJ/mol,降低约24.2%。表明该复合物具有良好的防吸湿性和热分解性能,有望应用于固体推进剂中以改善其燃烧性能。
To improve the hygroscopicity and thermal decomposition performance of AP,the AP particles were coated with polydopamine(PDA)based on the oxidative self-polymerization of dopamine by the in-situ coating method,and the AP/PDA/Fe_(2)O_(3)composite was successfully prepared via the uniform combination of nano-Fe_(2)O_(3)and AP/PDA composite due to the strong adhesion property of PDA.The prepared AP and its composites were characterized by particle size analyzer,scanning electron microscope-energy dispersive spectrometer(SEM-EDS)and X-ray photoelectron spectroscopy(XPS)to confirm its particle size,surface morphology and element composition.The moisture absorption performance was obtained by using the mass gain method and contact angle test,and the thermal decomposition performance was measured by differential scanning calorimetry(DSC).The results exhibited that the PDA was uniformly deposited on the surface of AP,and the nano-Fe_(2)O_(3)was then evenly absorbed on the surface of AP/PDA.The moisture absorption rate of the AP/PDA/Fe_(2)O_(3)composite was 0.16%,and the contact angle reached 41.8°.The high-temperature decomposition peak temperature(HTD)of the AP/PDA/Fe_(2)O_(3)composite was decreased by 48.5℃and the heat release was doubled compared to that of AP.Meanwhile,the apparent activation energy reduced from 209.5kJ/mol to 128.8kJ/mol by about 24.2%compared to that of AP.It demonstrated that the resulting composite has good anti-hygroscopicity and thermal decomposition,which show great potential in the field of solid propellants to improve their combustion performance.
作者
边圆
杨凌枫
李纯志
毛长勇
伍波
裴重华
BIAN Yuan;YANG Ling-feng;LI Chun-zhi;MAO Chang-yong;WU Bo;PEI Chong-hua(State Key Laboratory of Environment-friendly Energy Materials,Southwest University of Science and Technology,Mianyang Sichuan 621010,China;Luzhou North Chemical Industries Co.Ltd.,Luzhou Sichuan 646003,China)
出处
《火炸药学报》
EI
CAS
CSCD
北大核心
2022年第4期504-512,共9页
Chinese Journal of Explosives & Propellants
基金
国家自然科学基金(No.21905236)
环境友好能源材料国家重点实验室基金(No.20fksy18)。
