灭草喹高效液相色谱分析

本文用反相高效液相色谱法，采用ＣＬＣ－ＯＤＳ色谱柱，以甲醇：酸性水（５０：５０）作为流动相，在２３０纳米下检测灭草喹中有效成分含量。     

1—萘胺—4—磺酸钠中1—萘胺含量的高效液相色谱分析

本文报道了有机中间体１－萘胺－４－磺酸钠中１－萘胺含量的反相高效液相色谱的分析，方法采用Ｚｏｒｂａｘ－Ｃ１８柱，以５０：５０的甲醇／水为流动相。方法具有简单，准确，精度高的优点。     

烟嘧黄隆高效液相色谱分析

本文报道采用高效液相色谱法，以Ｃ１８反相柱为分离柱，以乙腈：甲醇：不：乙酸＝３０：２０；５０：０．５，为流动相，检测小长为２４１纳米，用标法测定烟嘧黄隆的含量。     

碳钢—硝酸体系腐蚀与缓蚀行为研究

采用失重法、容量法和电化学方法研究了碳钢在５０ｇ／ｋｇ ＨＮＯ３中的腐蚀行为，并对Ｌａｎ－５在碳钢－５０ｇ／ｋｇ ＮＨＯ３体系中的缓蚀行为进行了初步探索研究。实验结果表明：碳钢在５０ｇ／ｋｇ ＨＮＯ３中的阳极腐蚀产物是Ｆｅ＾３＋，阴极反应主要不是析氢反应。Ｌａｎ－５是碳钢－５０ｇ／ｋｇ ＨＮＯ３体系的高效缓蚀剂，其缓蚀效率可达到９９．９％，缓蚀剂之间具有显著的协同作用。研究结果还发现，碳钢在硝酸－     

开拓进取 不断创新

介绍了大乘资氮集团公司最近几年完成的技术开发和技术改造成果：造气炉炉况监测与优化，用贵州无烟块煤成功地制取原料，粉煤灰浮选工程，风机水泵电机采用变频调速，采用６Ｍ５０型氢氮压缩机，变换脱碳工序计算机控制等。     

开拓进取 不断创新

介绍了大乘资氮集团公司最近几年完成的技术开发和技术改造成果：造气炉炉况监测与优化，用贵州无烟块煤成功地制取原料，粉煤灰浮选工程，风机水泵电机采用交频调速，采用６Ｍ５０型氢氮压缩机，变换脱碳工序计算机控制等。     

反相HPLC法测定卷烟烟气中的烟碱

采用反相ＨＰＬＣ法测定卷烟烟气总粒相物中烟碱的含量,流动相为水：Ｈ３ＰＯ４ － ＫＨ２ＰＯ４（５０：５０）缓冲液,检测波长λ＝２６２ｎｍ ,线性范围：７ ～１００ｍｇ／５０ｍｌ。实验证明,该方法的准确度高,精密度好,可作为检测烟碱的可靠方法     

喷气混纤纱复合材料短梁剪切试验研究

采用ＧＢ３３５７－８２标准,对单向玻璃纤维／聚丙烯长丝（重量比５０：５０）喷气混纤纱复合材料的短梁剪切特性进行了研究。试验结果：试样只发生屈服破坏;在整个厚度方向没有分层破坏。     

料温对RIM交联型聚氨酯脲结构与性能的影响

采用便携式微型反应注射成型机制备了一组料温分别为３０，４０，５０，６０℃的交联型聚氨酯脲。用ＤＳＣ和力学性能对试样进行表征的结果表明：料温提高有利于软、硬微相的混合，而硬链段微区的有序性变差。反映在宏观力学性能上则表现为：试样的拉伸强度提高，伸长率在５０℃料温时出现极大值，弯曲强度和弯曲模量则出现最小值。料温为３０℃时，物料混合不充分，随着料温升高，混合逐渐均匀，试样透明度提高。     

薄层芳纶复合材料(内衬吸能垫)的平头冲击性能研究

为研究薄层芳纶复合材料的冲击机理－为轻质薄层结构设计提供基础数据和理论依据，本文采用圆柱平头型冲头（直径为２５ｍｍ）在一定的冲击速度范围内冲击薄层复合材料（厚度：１．５０－２．５０ｍｍ），利用加速度传感器分析复合材料冲击背面的应力动态变化情况，研究了影响复合材料抗平头碰撞能力的因素和复合材料的冲击损伤过程。结果表明：影响复合材料抗平头碰撞能力的主要因素是纤维织物本身特性、纤维含量和界面强度；冲击能     

Nanoclay distribution and its influence on the mechanical properties of rubber blends

The distribution of modified and unmodified nanoclays inside the rubber phases of immiscible rubber–rubber blends composed of nonpolar–polar natural rubber (NR)/epoxidized natural rubber (ENR) and nonpolar–nonpolar NR/polybutadiene rubber (BR) was investigated for the first time. The distribution of clays at various loadings in the blends was calculated from the viscoelastic properties of the blends. For example, in the 50 : 50 NR/ENR blend, 42% Cloisite 30B migrated to the NR phase, and 58% went to the ENR phase. However, in the same blend, only 7% Cloisite Na⁺ was found in the NR phase, and 93% was found in the ENR phase. Again, in the 50 : 50 NR/BR blends, the NR phase contained 85% Cloisite 30B, whereas 55% Cloisite Na⁺ migrated to the NR phase. All these observations were explained with the help of viscosity, X‐ray diffraction, and morphology analyses. The effect of the distribution of the clay on the mechanical properties was also discussed. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Sintering behavior and phase transformation of YSZ-LZ composite coatings

Sintering behavior and phase transformations in yttria-stabilized zirconia (YSZ)-based thermal barrier coatings (TBCs) control their applications in gas turbines operated at high working temperatures required for improved fuel efficiency. In this work, to control the sintering behavior and reduce phase transformations in YSZ-based TBCs, lanthanum zirconate (LZ) powder was blended with the YSZ feedstock powder, and YSZ-LZ composite coatings were fabricated using the air plasma spraying method. The influence of mixture weight ratio of YSZ to LZ (75:25, 50:50, and 25:75) on the sintering behavior and phase stability of the composite coatings was investigated through the isothermal exposure test at 1100, 1300, and 1400 °C. The as-coated composites showed the pyrochlore and tetragonal phases, indicating that the phases are LZ and YSZ, respectively. As the exposure temperature was increased, the phase transformation of YSZ from the tetragonal phase to the monoclinic phase was accelerated. The content of monoclinic phase was changed with the increasing LZ content after thermal exposure at 1300 and 1400 °C. In addition, the composites showed different sintering and bridging behaviors at the adjacent splats with the LZ content. The composites prepared with the blended feedstock powders of LZ and YSZ produced an obvious effect on the phase stability and mechanical properties.     

非水微乳体系相图研究

研究了以甲醇或甲酰胺为极性相,正辛烷为油相,添加不同HLB值的表面活性剂形成的非水微乳体系的三元相图.结果表明,具有适当HLB值的表面活性剂可与正辛烷、甲醇或甲酰胺形成单相区,亲水性强的表面活性剂不利于形成单相微乳体系;在m(表面活性剂):m(正辛烷)=1∶4,甲醇(甲酰胺)增溶量为最大增溶量的50％时,各微乳液相点的粒径在20～60 nm.     

Phytoextract assisted hydrothermal synthesis of ZnO–NiO nanocomposites using neem leaves extract

This work represents the synthesis of zinc oxide nanorods, nickel oxide nanoparticles, and zinc oxide-nickel oxide nanocomposites by combining Neem leave extract with hydrothermal synthesis. Five samples were prepared by green synthesis which is based on Neem leaves aqueous extract followed by hydrothermal treatment at 250 °C for 2.5 h. The five prepared samples are: 100% NiO (N100), 75% NiO: 25% ZnO (Z25-N75), 50% NiO: 50% ZnO (Z50-N50), 25% NiO: 75% ZnO (Z75-N25), and 100% ZnO (Z100). The prepared nanoparticles and nanocomposites were characterized by FTIR, XRD, SEM, and TEM. The XRD results show that the ZnO formed as a hexagonal wurtzite phase and NiO as a cubic phase. The microstructure of the formed samples is versatile with nanorods ZnO and spherical NiO. The nanocomposites microstructure appears as a heterostructure of both oxides with NiO particles on the surface of ZnO rods. The TEM confirms the nanosize and the crystallinity of samples.     

Reaction sintered zirconium titanate-zirconia bulk materials from 3Y2O3-stabilized zirconia and TiO2. Phase composition and their potential for thermal shock applications

This work evaluates the potential of zirconium titanate-zirconia composites for thermal shock. Materials with Zr_0.97Y_0.03O_1.985:TiO₂ molar ratios 50:50 (Z(Y)T50) and 70:30 (Z(Y)T70) were obtained from Y₂O₃ (3 mol%)-stabilized ZrO₂ and TiO₂ mixtures colloidal processed and reaction sintered at 1773 K with low cooling rate (2-5 K/min). The crystalline phases and their unit cell parameters were determined by Rietveld analysis of high resolution X-ray diffraction patterns. The zirconium titanate phase in these materials is o-TiZrO₄, being the major phase in Z(Y)T50 in which c-ZrO₂ is secondary phase. Z(Y)T70 has t-ZrO₂ as main phase, o-TiZrO₄ as secondary phase and c-ZrO₂ and m-ZrO₂ as minor phases. The Hasselman thermal shock resistance factors, calculated using the experimental values of the involved properties, Young's modulus, thermal expansion coefficient, and fracture strength, have demonstrated the high potential of zirconia-zirconium titanate composites for thermal shock applications in oxidizing atmospheres.     

Natural rubber/nitrile butadiene rubber/hindered phenol composites with high-damping properties

New natural rubber (NR)/nitrile butadiene rubber (NBR)/hindered phenol (AO-80) composites with high-damping properties were prepared in this study. The morphological, structural, and mechanical properties were characterized by atomic force microscopy (AFM), polarized Fourier transform infrared spectrometer (FTIR), dynamic mechanical thermal analyzer (DMTA), and a tensile tester. Each composite consisted of two phases: the NR phase and the NBR/AO-80 phase. There was partial compatibility between the NR phase and the NBR/AO-80 phase, and the NR/NBR/AO-80 (50/50/20) composite exhibited a co-continuous morphology. Strain-induced crystallization occurred in the NR phase at strains higher than 200%, and strain-induced orientation appeared in the NBR/AO-80 phase with the increase of strain from 100% to 500%. The composites had a special stress–strain behavior and mechanical properties because of the simultaneous strain-induced orientation and strain-induced crystallization. In the working temperature range of a seismic isolation bearing, the composites (especially the NR/NBR/AO-80 (50/50/20) composite) presented a high loss factor, high area of loss peak (TA), and high hysteresis energy. Therefore, the NR/NBR/AO-80 rubber composites are expected to have important application as a high-performance damping material for rubber bearing.     

Hydrogen bonding in blends of polyesters with dipeptide‐containing polyphosphazenes

New biomedically erodible polymer composites were investigated. Polyphosphazenes containing the dipeptide side groups alanyl–glycine ethyl ester, valinyl–glycine ethyl ester, and phenylalanyl–glycine ethyl ester were blended with poly(lactide‐co‐glycolide) (PLGA) with lactic to glycolic acid ratios of 50 : 50 [PLGA (50 : 50)] and 85 : 15 [PLGA (85 : 15)] with solution‐phase techniques. Each dipeptide ethyl ester side group contains two N? H protons that are capable of hydrogen bonding with the carbonyl functions of PLGA. Polyphosphazenes that contain only the dipeptide ethyl ester groups are insoluble in organic solvents and are thus unsuitable for solution‐phase composite formation. To ensure solubility during and after synthesis, cosubstituted polymers with both dipeptide ethyl ester and glycine or alanine ethyl ester side groups were used. Solution casting or electrospinning was used to fabricate polymer blend matrices with different ratios of polyphosphazene to polyester, and their miscibilities were estimated with differential scanning calorimetry and scanning electron microscopy techniques. Polyphosphazenes with alanyl–glycine ethyl ester side groups plus the second cosubstituent were completely miscible with PLGA (50 : 50) and PLGA (85 : 15) when processed via solution‐casting techniques. This suggests that the hydrogen‐bonding protons in alanyl–glycine ethyl ester have access to the oxygen atoms of the carbonyl units in PLGA. However, when the same pair of polymers was electrospun from solution, the polymers proved to be immiscible. Solution‐cast miscible polymer blends were obtained from PLGA (50 : 50) plus the polyphosphazene that was cosubstituted with valinyl–glycine ethyl ester and glycine ethyl ester side groups. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

PBT/PC/E-MA-GMA三元共混体系的力学性能与亚微相态

将乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯(E-MA-GMA)三元共聚物与聚碳酸酯(PC)增韧聚对苯二甲酸丁二酯(PBT),研究了其力学性能、亚微相态和强韧化机制。结果表明,当m(PBT)／m(PC)为50:50,三元共混体系在w(E-MA-GMA)为10％时,缺口冲击强度达93 kJ／m2,同时拉伸强度达到54 MPa。扫描电子显微镜观察发现,E- MA-GMA作为柔性界面层,起到反应性增容作用,使PC分散相的相畴尺寸变小。PC相特有的相形态以及柔性界面层的存在是三元共混体系强韧化的主要机制。     

反相悬浮聚合法制备阳离子聚丙烯酰胺

用反相悬浮法,以甲基丙烯酰氧乙基三甲基氯化胺（DMC）和丙烯酰胺（AM）为单体,V-50为引发剂,合成了阳离子聚丙烯酰胺（CPAM）。实验结果表明,较佳工艺条件为：分散剡为浓度3,6％的Span60-Span80（1：1）,引发剂浓度0.6‰,单体配比AM：DMC为1：1,单体浓度为60％。