Synthesis of a benzoxazine monomer containing maleimide and allyloxy groups

A novel benzoxazine monomer 3-（4-allyloxy）phenyl-3,4-dihydro-2H-6-（N-maleimido）-l,3-benzoxazine （AMB） was synthesized and structure was confirmed by FT-IR, 1H NMR. Thermal analysis （DSC） of AMB showed the introduction of allyloxy group melting point and exhibited a narrow and symmetric curing exothermic window.     

A study of dilational rheological properties of polymers at interfaces

Viscoelastic properties of two polymers, partially hydrolyzed polyacrylamide and partially hydrolyzed modified polyacrylamide, widely used in chemical flooding in the petroleum industry, were investigated at three interfaces, water-air, water-dodecane, and water-crude oil, by means of a dilational method provided by I.T. Concept, France, at 85 degrees C. Polymer solutions were prepared in brine with 10,000 mg/l sodium chloride and 2000 mg/l calcium chloride. It has been shown that the viscoelastic modulus increases with the increment of polymer concentration in the range of 0-1500 mg/l at the water-air interface. Each polymer shows different viscoelatic behavior at different interfaces. Generally speaking, values of the viscoelastic modulus (E), the real part (E'), and the imaginary part (E") at the crude oil-water interface for each polymer are lower than at the air-water or water-dodecane interface. The two polymers display different interfacial properties at the same interface. Polymer No. 2 gives more viscous interfaces than polymer No. 1. All the information obtained from this paper will be helpful in understanding the interfacial rheology of ultra-high-molecular-weight polymer solutions.     

含硅芳香二胺的合成及其聚酰亚胺硅氧烷的热性能

从ｐ－或ｍ－氯苯胺出发，经三步反应合咸位置弄构的四甲基［双（苯胺）］二硅氧烷和六甲基［双（苯胺）］三硅二氧烷，总产率为２５％．与芳香二胺和芳香四酸二酐共聚得聚酰亚胶硅氧烷．研究了共聚物在玻璃化转变区的热松弛行为．对位异构体的共聚物，其分子链段的构象熵大，运动较易．     

370-410nm波段CS2的共振多光子电离研究

对CS。人们曾做过广泛的研究，其中光谱研究以吸收谱最多，CSZ的解离动力学的研究也比较多．Butler等［‘］用193urn激光单光子激发CSZ获得CS碎片，研究了CSZ的解离．Seaver等［’1分别用266DD和193。激光多光子电离CSZ．但他们都是在固定激发波长下研究CSZ的解离．在370－405u     

Non-destructive bone aluminum assay by neutron activation analysis

A non-destructive method based on instrumental neutron activation analysis (INAA) for the assay of aluminum in bone samples is described. The²⁸Al signal obtained upon neutron irradiation includes contributions from both the reaction²⁷Al(n,)²⁸Al and³¹P(n,)²⁸Al. The first reaction is with the thermal neutrons and the second one is with the fast neutrons. The contribution from the³¹P reaction is calculated from the fact that Ca/P ratio in bone mineral is constant and the amount of calcium can be measured from the thermal reaction⁴⁸Ca(n, )⁴⁹Ca. The aluminum values obtained by the INAA procedure agreed within 10% of those obtained by atomic absorption spectrophotometry. With this assay the levels of aluminum in normal bones (<70 g g^–1 apatite) cannot be determined reliably but higher aluminum levles in bone biopsies associated with Al toxicity, e.g. some patients with renal osteodystrophy, can be determined with a precision of ±10%.     

Chemiluminescence flow-through sensor for ofloxacin using solid-phase PbO(2) as an oxidant

A novel chemiluminscence (CL) flow-through sensor for ofloxacin is described. It was based on the sensitizing effect of ofloxacin on the CL oxidation of sulfite by PbO(2) in H(2)SO(4) media. By a very simply means, the solid-phase PbO(2) was immobilized inside of the CL flow cell as CL oxidant. The column of solid PbO(2) could be reused about 400 times during a period of 50 h. The calibration graph is linear in the range 0.2-10 mug ml(-1) with a detection limit of 7.8x10(-8) g ml(-1) (S/N=3). This method has been successfully applied to determine ofloxacin in pharmaceutical preparation.     

L-Prolinamide Catalyzed Aqueous Direct Aldol Reaction： an Environment-friendly Method for the Synthesis of β- Hydroxyl keto nes

An environment-friendly L-prolinamide catalyzed aldol reaction has been developed. The reaction exhibited broad substrate generality, and high yields with good diastereoselectivity were obtained for cyclic ketones.The simplicity of product isolation, usage of water as environmentally benign reaction medium, and the usage of cheap, readily available and recyclable catalyst make this process promising to be developed for large-scale preparation of β-hydroxyl ketones.     

酪氨酸激酶抑制剂的三维定量构效关系研究

利用柔性原子受体模型(FLARM)方法对一系列的异黄酮和喹诺酮衍生物表皮生长因子受体酪氨酸激酶抑制剂进行了三维定量构效关系研究，得到了合理的构效关系模型.FLARM方法的计算结果还给出了虚拟的受体模型，该模型说明了抑制剂与受体之间可能的相互作用.由该虚拟受体模型得到的受体-配体相互作用与Novartis药效团模型比较类似.     

2, 4-二卤代高立方烷的合成

高立方烷-2, 4-二羧酸(1)通过Barton脱羧氯化反应, 可合成出2, 4-二氯高立方烷(3); 而通过改进的Hunsdiecker反应, 则可分别合成出2, 4-二溴高立方烷(4)和2, 4-二碘高立方烷(5)。     

动力极谱法测定海水中痕量锰

本文研究了孔雀绿极谐波性能,确定在醋酸-醋酸钠(pH=4.2)介质中,在示波极谱仪上可得到良好的极谱波。峰电位为-0.67伏(S.C.E)。用极谱法研究锰催化高碘酸钾氧化孔雀绿反应的机理。介绍了不需分离而直接测定海水中痕量锰的方法。其灵敏度可达0.2μg/l,对含10.1/μg锰的海水样进行11次平行测定,相对标准偏差为4.1%。本法亦适合自来水、河水中锰的分析。