KINETICS OF NON-ISOTHERMAL CRYSTALLIZATION OF POLY (ETHYLENE TEREPHTHALATE) MODIFIED BY POLY (ETHYLENE GLYCOL)

The non-isothermal crystallization kinetics of poly(ethylene terephthalate) (PET) modified by poly (ethlene glycol) (PEG) were determined by DSC. The dual linear regression method was used to evaluate the relationship between the reciprocal of t 1/2 ( the half life of crystallization) and the appropriate temperature variable. The parameters such as the activation energy (Ed) for transport, the equilibrium melting temperature (T_m~0),the nucleation parameter (ψ),themaximum crystallization temperature (T_(e, max)), and the kinetic crystallizability (G) for the copolyesters were obtained. The influence of the PEG content in PET chains on the parameters characterizing crystallization kinetics and crystallization thermodynamics was discussed.     

CuO／活性炭和Fe2O3／活性炭催化还原NO

ＣｕＯ／活性炭和Ｆｅ_２Ｏ_３／活性炭催化还原ＮＯ高志明，赵震，杨向光，吴越（中国科学院长春应用化学研究所长春１３００２２）关键词活性炭，还原，ＮＯ，氧化铜，氧化铁目前，对固定源的ＮＯ处理是采用Ｖ２Ｏ５／ＴｉＯ２作催化剂，ＮＨ３作还原剂的选择催化还原方...     

Imidazole Coordinated Sandwich-type Antimony Polyoxotungstates Na9[ {Na（H=O2}3{M（C3H4N2）}3（ Sb W9O33）2]·xH=O（M=Ni^Ⅱ, Co^Ⅱ, Zn^Ⅱ, Mn^Ⅱ）

The imidazole covalently coordinated sandwich-type heteropolymngstates Na9[ {Na（H=O2}3{M（C3H4N2）}3（ Sb W9O33）2]·xH=O（M=Ni^Ⅱ, Co^Ⅱ, Zn^Ⅱ, Mn^Ⅱ） were obtained by the reaction of Na2WO4·2H2O, SbCl3·6H2O, NiCl2·6H2O [MnSO4·H2O, Co（NO3）2·6H2O, ZnSO4·7H2O] and imidazole at pH≈7.5. The structure of Na9[{Na（H2O）2}3{Ni（C3H4N2）}3（SbW9O33）2]·32H2O was determined by single crystal X-ray diffraction. Polyanion [{Na（H2O）2}3{Ni（C3H4N2）}3（SbW9O33）2}3]^9- has approximate C3v symmetry, imidazole coordinated six-nuclear duster [{Na（H2O）2}3{Ni（C3H4N2）}3]^9＋ is encapsulated between two （α-SbW9O33）^9-, the three rings of imidazole in the polyanion are perpendicular to the horizontal plane formed by six metals （Na-Ni-Na-Ni-Na-Ni） in the central belt, and x-stacking interactions exist between imidazoles of neighboring polyanions with dihedral angel of 60%. The compounds were also characterized by IR, UV-Vis spectra, TG and DSC, and the thermal decomposition mechanism of the four compounds was suggested by TG curves.     

提高非贵金属临氢脱腊催化剂异构化能力的研究

通过水热条件下合成分子筛试验条件的考察,获得了合成条件和性能良好的ZSM-8分子筛。采用无定形硅铝和ZSM-8分子筛制备出复合载体型的非贵金属临氢脱腊催化剂,通过锌和钨改性组分的添加,提高现有工业催化剂的异构化能力。实验结果表明,不同复合载体、改性组分对催化性能有较大影响,但改性组分的添加次序无明显作用。与以前β沸石基催化剂性能相比,ZSM-8基催化剂不仅提高了润滑油收率,而且产品润滑油的粘度指数也明显提高。催化性能的改进可以归结为改性后催化剂异构化能力的提高。     

应用中药材开发微量元素保健品

介绍了用中药村开发几种微量元素保健品，有补锌，有助小儿生长，补硒抗癌，补铁钴养血，补铬治糖尿病和补锌铅的肝病滋补保健品。     

CO+H_2一段法合成汽油复合催化剂的研究 Ⅰ.分子筛的影响

用TPD法测定了四种不同分子筛的表面酸性。结合不同复合催化剂上产物的分布,探讨了分子筛酸性与CO+H_2产物选择性的关系。实验结果表明,分子筛上强酸中心是形成C_5~+烃的活性中心,而低碳烃的形成则与分子筛上的较弱酸中心有关。     

方酸染料在远红光区／近红外区对纳米晶二氧化钛电极的高效敏化作用

Four para-dialkylaminophenyl （PDAAP1-PDAAP4） bearing carboxyl groups were studied for application to the dye-sensitized solar cells （DSC）. It was found the short spacer CH2 between carboxyl and dialkylaminophenyl chromophore in PDAAP3 and PDAAP4 led to highly efficient monochromatic incident photon-to-current conversion efficiencies （IPCE）, however the long alkyl group C4H9 attached on aniline moieties in PDAAP2 and PDAAP4 favored improvement of open-circuit photovoltage. Thus, the solar cell sensitized by PDAAP4, having both short carboxyl groups CH2COOH and long alkyl groups C4H9, exhibited the IPCE maximum of 73% at 670 nm and overall energy conversion efficiency η of 3.06%, representing the highest IPCE and η values so far in dialkylaminophenyl-based organic dye-sensitized semiconductor solar cells. Taking advantage of the highly efficient sensitizing ability of PDAAP4 in far-red region, the data of IPCE above 630 nm of the solar cells were improved greatly by cosensitization with both N3 and PDAAP4. The influences of the TiO2 film thickness and the concentration of 4-tert-butylpyridine （TBP） in electrolyte were also investigated.     

丙烯酸甲酯/4-丙烯酰胺基-2,2,6,6-四甲基哌啶光共聚合体系的竞聚率和序列分布研究

以丙烯酸甲酯(MA,M1)和4-丙烯酰胺基-2,2,6,6-四甲基哌啶(AATP,M2)溶液光共聚合体系为研究对象,采用1H-NMR手段测定了MA/AATP共聚物的组成,用Mayo-Lewis积分法和扩展Kelen-Tüdos方法计算的竞聚率分别为0.88相似文献   

毛细管区带电泳法快速测定复方布洛芬片的有效成分

研究了用毛细管区带电泳法快速测定复方布洛芬片中布洛芬和伪麻黄碱含量的方法。在０．０２５ｍｏｌ／Ｌ的磷酸盐缓冲液（ｐＨ８．１）中，上述两组分可在３ｍｉｎ内得以完全分离，用紫外检测器在２１０ｎｍ处检测，并以外标法定量。１１次测定含有９．５ｍｇ／Ｌ盐酸伪麻黄碱和６６．７ｍｇ／Ｌ布洛芬的试样溶液，相对标准偏差为２．９％（伪麻黄碱）和１．９％（布洛芬），回收率为１０３．１％（伪麻黄碱）和９７．６％（布洛芬）。应用毛细管区带电泳法测定复方布洛芬片剂的含量，所得结果与ＨＰＬＣ法一致。     

β-环糊精修饰区带毛细管电泳法快速测定染料木甙、染料木素、山柰酚和芦丁

通过研究缓冲溶液的pH和浓度、β-环糊精浓度、十二烷基硫酸钠浓度和毛细管温度等条件,建立了一种β-环糊精修饰区带毛细管电泳法快速测定染料木甙、染料木素、山柰酚和芦丁的方法。在优化的条件下,4种物质在6 min内得到良好分离。染料木甙、染料木素、山柰酚和芦丁峰面积和质量浓度分别在2~400,2~300,2~200和5~500 mg.L-1范围内呈线性关系。染料木甙、染料木素、山柰酚和芦丁的检出限分别为0.8,0.6,0.6和1.4 mg.L-1。方法用于分析生槐角和炙槐角样品并做加标回收试验,回收率结果在93.8%~105.2%。