乙酰二茂铁缩4－苯氨基硫脲与UO_2~（2＋）、Hg~（2＋）、Ni~（2＋）、Zn~（2＋）的希夫碱配合物的合成与表征

乙酰二茂铁缩４－苯氨基硫脲（Ｃ_（１９）Ｈ_（１９）Ｎ_３ＳＦｅ）与某些金属离子在无水乙醇中反应得到了希夫碱配合物Ｍ·Ｌ·Ｘ_２·ｎＨ_２Ｏ（Ｍ为ＵＯ_２~（２＋）、Ｈｇ~（２＋）、Ｎｉ~（２＋）、Ｚｎ~（２＋）；Ｌ为Ｃ_（１９）Ｈ_（１９）Ｎ_３ＳＦｅ；Ｘ为ＮＯ３－、Ｃｌ－、ＳＯ_４~（２－）；ｎ＝０—６），并对配合物的组成及某些物理化学性质进行了测试和表征。     

乙酰二茂铁缩4—苯氨基硫脲与UO^2＋2,Hg^2＋,Ni^2＋,Zn^2＋,的…

乙酰二茂铁缩４－苯氨基硫脲（Ｃ１９Ｈ１９Ｎ３ＳＦｅ）与某些金属离子在无水乙醇中反应得到了希夫碱配合物Ｍ．Ｌ．Ｘ２．ｎＨ２Ｏ（Ｍ为ＵＯ＾２＋２，Ｈｇ＾２＋，Ｎｉ＾２＋，Ｚｎ＾２＋，Ｌ为Ｃ１９Ｈ１９Ｎ３ＳＦｅ；ＮＯ＾－３，Ｃｌ＾－，１／２ＳＯ＾２－４；ｎ＝０－６）并对配合物的组成及某些物理化学质进行了测试和表征。     

TRPO流程中U的反萃：Ⅱ.（NH4）2CO3对U的反萃

研究了用 ５０ ｇ／ Ｌ（ Ｎ Ｈ４ ）２ Ｃ Ｏ３ 溶液从含 Ｕ 的 Ｔ Ｒ Ｐ Ｏ 相中反萃 Ｕ 的条件。测定了反萃平衡时间、相比、反萃次数、温度及有机相中 Ｕ 的质量浓度对反萃率的影响。用（ Ｎ Ｈ４）２ Ｃ Ｏ３ 反萃 Ｕ 比原流程的 Ｎａ２ Ｃ Ｏ３ 可减少 ２ 级,反萃液中不会析出（ Ｎ Ｈ４）２ Ｃ２ Ｏ４ 结晶。（ Ｎ Ｈ４）４［ Ｕ Ｏ２（ Ｃ Ｏ３）３ ］在加热转型时, Ｎ Ｈ＋４ 、 Ｃ Ｏ２－３ 及少量 Ｃ２ Ｏ２－４ 、 Ｎ Ｏ－３ 均可挥发除去。     

温敏聚合物的辐射合成及其对水溶液中低浓Au~（3＋）的浓集研究

应用γ辐射聚合技术在Ｈ２Ｏ－ＴＨＦ混合溶液中合成了不同分子量范围的温敏聚合物，并进而将这种辐射合成扩展到应用低级醇类、酮类和含氯有机化合物作为溶剂，结果表明，这些合成都是成功的。用合成的聚合物对在水溶液中浓集低浓Ａｕ~（３＋），浓集效率可达９０％以上。还研究了溶液酸度（以ｐＨ为１～７最佳）、聚合物含量（１０％以上可达饱和浓集率）及波集温度（接近ＬＣＳＴ为好）对浓集的影响。     

高温气冷堆He载气中H2和CO转化实验研究

研究了Ｈ＿２和ＣＯ在ＣｕＯ－ＺｎＯ＿Ａｌ＿２Ｏ＿３催化床中转化成Ｈ＿２Ｏ和ＣＯ＿２的实验装置和实验结果，论证了不同床层工作温度、系统压力、杂质浓度、流量及露点温度等因素对氧化铜床工作性能的影响；测得了Ｈ＿２和ＣＯ在ＣｕＯ－ＺｎＯ－Ａｌ＿２Ｏ＿３床上的转化特性曲线等变化规律，获得了转化容量、工作周期和转化效率等实验数据，确定了最佳运行参数。结果表明，使用ＣｕＯ＿ＺｎＯ－Ａｌ＿２Ｏ＿３床可使净化后的Ｈ＿２和ＣＯ的体积分数都小于２×ｌ０￣（－６），满足高温气冷堆的净化要求。为高温气冷堆中氧化铜床装置提供了可靠的设计数据。     

二（2—乙基己基）单（或二）硫代磷（膦）酸对示踪量镅和稀土元素的萃取

研究了二（２－乙基己基）二硫代磷酸（ＤＥＨＤＴＰ）、二（２－乙基己基）单硫代磷酸（ＤＥＨＭＴＰ）和二（２－乙基己基）单硫代膦酸（ＤＥＨＭＴＰＩ）对Ａｍ３＋、Ｎｄ３＋、Ｅｕ３＋、Ｔｍ３＋的萃取，给出了ｌｇＤ对ｐＨ和ｌｇｃ（ＨＡ）的关系图。通过比较半萃取ｐＨ值和分离系数，表明３种萃取剂对４种离子的萃取能力依次为：ＤＥＨＭＴＰＩ＞ＤＥＨＭＴＰ＞ＤＥＨＤＴＰ，但只有ＤＥＨＤＴＰ优先萃取Ａｍ３＋。对镅萃取选择性的顺序为：ＤＥＨＤＴＰ＞ＤＥＨＭＴＰＩ＞ＤＥＨＭＴＰ。此结果再次说明，Ａｍ３＋是比Ｌｎ３＋“软”一些的硬酸。     

HBMPPT—DOSO—甲苯体系对铀（Ⅵ）的萃取及铀（Ⅵ）,钍（Ⅳ）之间的分离

以４－苯甲酰基－２,４－二氢－５－甲基－２－苯基－３Ｈ－吡唑唑酮－３（ＨＢＭＰＰＴ）为萃取剂,二正辛基亚砚为协萃剂,研究其在硝酸介质中对铀的萃取行为,以及萃取剂浓度、酸度等各种对萃取分配比的影响,以确定两种萃取剂的协同取及分离效果。     

HBMPPT-DOSO-甲苯体系对铀(Ⅵ)的萃取及铀(Ⅵ)、钍(Ⅳ)之间的分离

以个苯甲酰基－２,４二氢－５－甲基－２－苯基－３Ｈ－吡唑硫酮－３（ＨＢＭＰＰＴ）为萃取剂、二正辛基亚砜（ＤＯＳＯ）为协萃剂,研究其在硝酸介质中对铀（Ⅵ）的萃取行为,以及萃取剂浓度、酸度等各种因素对萃取分配比的影响,以确定两种萃取剂的协同萃取及分离效果。结果表明,ＨＢＭＰＰＴ和ＤＯＳＯ有较好的协同萃取效果,一定条件下,铀（Ⅵ）、钍（Ⅳ）的分离系数可达５２３。     

DHDECMP与酸性萃取剂HPMBP,HTTA对镅的协同萃取

研究了ＤＨＤＥＣＭＰ－十氢萘－二甲苯在硝酸体 系中对镅（Ⅲ）的萃取和酸性萃取剂ＨＰＭＢＰ及ＨＴＴＡ与ＤＨＤＥＣＭＰ对镅的协同萃取。ＤＨＤＥＣＭＰ与ＨＰＭＧＢＰ、ＨＴＴＡ协同萃取Ａｍ＾３＋的协萃系数分别为１０＾２－１０＾３和１０＾２－１０＾４。     

1—[2—^3H[（2—羟基—3—甲氧丙基）—2—硝基—1H—咪唑的制备

以ＮａＢ＾３Ｈ４还原１－（２－氧－３－甲氧丙基）－２－硝基－１Ｈ－咪唑制得１－「２－＾３Ｈ」（２－羟基－３－甲氧丙基）－２－硝基－１Ｈ－咪唑。产品经硅胶－Ｈ柱洗脱，蒸馏，Ｓｅｐ－Ｐａｋ Ｃ１８柱处理，并经ＨＰＬＣ及液闪检测，化学纯度〉９９．９％，放射化学纯度〉９７％，比活度为１６．０５ＴＢｑ／ｍｏｌ。     

用PAT研究多嵌段聚醚氨酯脲的微畴结构

本文用正电子湮没、小角X射线散射和差示扫描量热等方法研究多嵌段聚醚氨酯脲的微畴结构。实验结果表明,硬段含量的增加引起微畴体积和自由体积减小,而软段分子量增加引起微畴体积和自由体积增大。     

Studies on microdomain structure in segmented polyether polyurethaneureas by positron annihilation lifetime and small—angle X—ray scattering

The microdomain structure of segmented polyether polyurethaneureas is investigated by means of positron annihilation lifetime spectroscopy,small-angle X-ray scattering and differential scanning calorimetry.The experimental results show that the decrease in the domain volume and free volume results from the increase in the hard segment (polyurethaneurea segment)contents as the number-average molecular weight Mn of the soft segments (polyethylene glycol segments)is the same,and that the increase in domain volume and free volume result from the increase in the Mn of the soft segments when the hard segment content is the same or nearly the same.These results demonstrate that positron annihilation lifetime spectroscopy is a sensitive technique to probe the microdomain structure in polymers.     

环氧树脂分子量对电子束辐射固化效果的影响

研究了分子量对于环氧树脂电子束辐射固化行为的影响规律。环氧树脂体系的辐射反应速率随分子量增加而下降,在低辐射剂量下,高分子量树脂的固化度和固化层厚度较小,提高辐射剂量,分子量的影响减弱。对于辐射固化程度较高的样品,其玻璃化温度(Tg)和贮能模量(E’)主要受固化度控制。电子束辐射固化的环氧树脂进行热处理后,样品的玻璃化温度和高温E’均有所提高,低分子量树脂的热处理效果更为明显。     

端羟基液体丁腈增韧环氧树脂体系的正电子谱学研究

采用正电子湮没技术研究了端羟基液体丁腈(HTBN)增韧环氧树脂(EP)体系的自由体积特性,证实了HTBN橡胶相与EP基体相界面过渡区域自由体积尺寸的大小和浓度与增韧效果相关.当HTBN的浓度为5%时,增韧效果最佳,相尺寸小,相界面过渡区域自由体积空穴尺寸与EP自身分子间自由体积空穴尺寸相当,增韧效果好;当HTBN的含量继续增加,分散相尺寸增大,过渡区域自由体积尺寸增加较快,增韧效果弱化.     

超高分子量聚乙烯的辐照效应

通过密度测定和ＤＳＣ热分析，观测了超高分子量聚乙烯的辐射效应。实验结果表明：在吸收剂量０—１．１３ＭＧｙ范围内，密度随吸收剂量的增加而增大，熔化热和熔点也有所增加，特别是在低剂量范围内增加十分明显。以上结果都说明，超高分子量聚乙烯在辐照过程中，结晶在完善或有新的结晶形成     

Study on sensitized radiation polymerization of solid trioxane on pilot-scale

A conversion rate of more than 90% was obtained in sensitized polymerization, and the output of radiation was double at a reduced total dose of 0.5 Mrad as compared to original 1 Mrad.The unpolymerized monomer could be removed simply by extraction under reduced pressure to save a large volume of organic solvent. The quota of raw material consumption would be reduced without influencing quality of the product.experiments indicated that the content of water in trioxane, even up to 300 ppm, has no effect on conversion o molecular weight. Irradiated trioxane was stored in dry air kept away from light at room temperature could effectively sustain the lifetime of active species even after a lapse of one month.The infrared spectrum, molecular weight distribution and physical mechanical properties of the product from sensitized radiation polymerization were identical with those of the unsensitized process.     

Microstructural characterization of semi-interpenetrating polymer networks by positron lifetime spectroscopy

Thermoset and thermoplastic polyimides have complementary physical/mechanical properties. Whereas thermoset polyimides are brittle and generally easier to process, thermoplastic polyimides are tough but harder to process. It is expected that a combination of these two types of polyimides may help produce polymers more suitable for aerospace applications. Semi-Interpenetrating Polymer Networks (S-IPNs) of thermoset LaRC™-RP46 and thermoplastic LaRC™-IA polyimides were prepared in weight percent ratios ranging from 100:0 to 0:100. Positron lifetime measurements were made in these samples to correlate their free volume features with physical/mechanical properties. As expected, positronium atoms are not formed in these samples. The second life time component has been used to infer the positron trap dimensions. The “free volume” goes through a minimum at about 50:50 ratio, suggesting that S-IPN samples are not merely solid solutions of the two polymers. These data and related structural properties of the S-IPN samples have been discussed in this paper.     

Study on construction of loss of component cooling water system initiating event fault tree for fire event PSA

ABSTRACT

In this study, the construction of the loss of component cooling water system (LOCCWS) initiating event (IE) fault tree (FT) for an actual fire event probabilistic safety assessment (PSA) model of the Korean reference nuclear power plant considering only IE initiators was validated. The quantification results of the LOCCWS accident sequences obtained using an LOCCWS IE FT model with only initiators are similar to that with initiators and enabling events. This confirmed that the LOCCWS IE FT for an actual fire event PSA model could be constructed by considering only IE initiators. In addition, the same LOCCWS accident sequences were quantified assuming that fire triggering only the LOCCWS IE leads to reactor shutdown. Compared with the quantification result obtained based on the assumption that any fire included in the fire event PSA leads to reactor shutdown, the core damage frequency (CDF) can be reduced. Thus, it can be concluded that there is a possibility of underestimation of CDF when the LOCCWS IE FT model with only initiators is used and the assumption that fire triggering only the LOCCWS IE results in reactor shutdown is employed for the quantification of LOCCWS accident sequences.     

高冲聚苯乙烯-低密度聚乙烯的自由体积特征与其相溶性的关系

不同组成的高冲聚苯乙烯(HIPS)和低密度聚乙烯(LDPE)共混物的正电子湮没寿命谱被测量，结果表明HIPS和LDPE是不相溶共混物。在界面处，二组分的不相溶主要归因与一个组分没有足够大的自由体积孔穴尺寸容纳另一组分的侧基和分子链端基。另外，测量的自由体积分数产生的负偏差被认为主要由最长寿命强度I3所引起。