Evaluation of Fatigue and Rutting Behavior of Asphalt Binder Containing Warm Additive

In this research study, Sasobit as warm additive was used to modify original binder (60/70 penetration grade). The binder fatigue and rutting performance was evaluated through linear amplitude sweep (LAS) and multiple stress creep and recovery test, respectively. Results indicated that 3% Sasobit modified binder has the highest percent recovery value and the lowest J_nr value, but had the highest sensitivity to a sudden increase in the stress level inside the asphalt mixture. The LAS test results demonstrated that the fatigue behavior of asphalt binders modified with 1% Sasobit is the highest one.     

Theoretical Studies on 4-amino-3,5-dinitropyrazole and Its Analogues

Seven analogues of a new high-energetic material, 4-amino-3,5-dinitropyrazole (LLM-116), were designed through changing NH₂ or NO₂ groups on the pyrazole ring of LLM-116. Density functional theory studies on LLM-116 and its analogues were performed at the B3LYP/6-31G(d) level. The geometric and electronic structures, natural bond orbital, charge on the nitro group (-Q_NO2 ), density, detonation properties, and bond dissociation energies (BDEs) of these molecules were investigated and compared with LLM-116. The results showed that molecules E , F , and G had comparable performance with better insensitivity characteristics and might be potential candidates of powerful energetic materials.     

Surimi-Like Products From Mutton

Surimi-like mutton products were produced using hand boned meat (HBM) and mechanically separated meat (MSM). Washing increased moisture and decreased fat and protein in surimi-like products. Collagen solubility and water holding capacity were higher for surimi-like products from MSM when compared to those from HBM. Washing reduced bone content of MSM. Percentage of 14:0, 16:0, 18:0 and 18:1 fatty acids tended to decrease and percentage of polyunsat-urated fatty acids tended to increase with washing. Acceptable restructured beef steaks with reduced salt content were produced when washed HBM or washed MSM were included.     

Ink-Jet Printing of Binders for Ceramic Components

Layered manufacturing methods for fabricating ceramic components can involve selective deposition of binder using ink-jet printing. Selection of a proper binder plays a critical role in fabricating parts with good surface finish, dimensional accuracy, and high resolution. Several polymeric solution-phase binders were investigated in terms of their physical properties, printing performance, and binder-powder bed interaction. It was observed that the molecular weight should be <15 000 for the binder to be penetrated into dense powder compacts. Binder infiltration kinetics and printed line width were also significantly influenced by powder-bed characteristics, such as surface roughness and pore size, as well as the physical properties of the binder, such as viscosity and surface tension.     

含能材料热力学计算在闪光烟火药剂配方设计中的应用

本文采用最小自由能法，通过C语言编辑的计算程序对各种含能材料的燃烧爆炸反应的能量特性参数进行热力学计算，计算结果与试验值进行比较，取得很好的一致性，并将该程序计算用于烟火药配方设计，取得良好的效果。     

联唑类含能化合物及其含能离子盐研究进展

联唑类含能化合物及其含能离子盐是近年发展起来的一类新型含能材料,具有高氮含量、高生成焓、高爆轰性能和相对钝感等特性,在新型炸药、低特征信号推进剂、气体发生剂、低烟或无烟烟火等领域有着广泛的应用前景。综述了有关联-1,2,4-三唑、联四唑和5-(1,2,4-三唑)四唑等联唑类含能化合物及其含能离子盐的最新合成研究成果,并对部分化合物的物化性能进行了阐述。认为下一步的工作重点为研究富氮阳离子的引入对联唑类含能化合物感度和爆轰性能的影响,合成出综合性能更好的联唑类含能化合物。设计了9种新型联唑类含能化合物,并利用量子化学方法对其性能进行预估。     

PAMMO基热塑性弹性体的合成及表征

以聚3–叠氮甲基–3–甲基氧杂环丁烷(PAMMO)为软段,2,4–甲苯二异氰酸酯和1,4–丁二醇为硬段,1,2–二氯乙烷为溶剂,采用溶液聚合一步法合成了含叠氮基热塑性弹性体(ATPE)。通过IR、GPC、DSC、力学性能测试等手段对ATPE的结构和性能进行了表征。结果表明:所合成的ATPE具有典型的叠氮聚醚聚氨酯特征;当R值为0.98,硬段质量分数为40%~45%时,聚合物的力学性能较优;ATPE的数均相对分子质量为50 000左右,玻璃化转变温度为–21.26℃,分解峰温为260.2℃。     

BuNENA含能增塑剂的性能及应用

BuNENA(N–丁基硝氧乙基硝胺)是一种性能优良的新型含能增塑剂,在枪炮发射药和火箭推进剂应用中均受到研究者的广泛关注,并被进行系统研究。在发射药中,BuNENA具有塑化能力强、工艺性能好、感度低、能量高等优点,能进一步提高配方力学性能,其应用前景广阔。而在HTPE(端羟基聚环氧乙烷–四氢呋喃嵌段共聚醚)火箭推进剂中,BuNENA已被证明是一种对提高能量、降低感度和提高推进剂力学性能等具有明显作用的新型含能增塑剂,使用HTPE/BuNENA黏合剂体系的钝感固体推进剂的综合性能优于HTPB/AP(端羟基聚丁二烯/高氯酸铵)推进剂,并可满足钝感弹药(IM)要求,已在各种战术发动机中获得了实际应用。     

1L慢烤燃装置温场分布数值模拟与试验研究

建立了一种1L慢烤燃装置模型,通过数值模拟分析其内部温场分布的影响因素和机理,通过改变模型中隔板尺寸、导流板形状、风扇数量和风扇转速等条件,研究了各种工况下烤燃装置内烧瓶周围温场分布。模拟结果表明,风扇数量与转速、隔板尺寸、导流板形状均会影响烧瓶周围温场分布的位置,但仅有风扇转速会影响温场响应的灵敏度、温场达到稳定所需时间和温场分布均匀性。理想的慢烤燃装置可实现的温场分布性能为:响应时间低于1 s,达到稳定时间低于30 s,均匀度在0.2℃左右。建立试验装置,在烧瓶外侧布置温度传感器,所得温场分布和温场均匀度与模拟结果一致。