DRS/SDS/NF体系中合成聚丁二烯胶乳的粒子形态的研究

在以歧化松香皂、十二烷基硫酸钠和间次甲基萘磺酸盐组成三元复合乳化剂体系中，研究了ＳＤＳ／ＤＲＳ、ＮＦ／ＤＲＳ、碳酸盐、丁二烯中二聚体及后处理工艺对ＡＢＳ用聚丁二烯胶乳的粒子形态等的影响。结果表明，ＳＤＳ／ＤＲＳ增加，ＰＢＬ平均粒径和粒子分散度均减小，且粒子开态趋于规整。     

DRS/SDS/NF体系中合成聚丁二烯胶乳的表观反应速率的研究

在以岐化松香皂（ＤＲＳ）、十二烷基硫酸钠（ＳＤＳ）和间次甲基萘磺酸盐（ＮＦ）组成三元复合乳化剂体系中，研究了丁二烯（Ｂｄ）中炔烃，二聚体（Ｄｉ），ＤＲＳ中的松香酸（ＲＡ），水相中的碳酸盐浓度及３种乳化剂复合比对ＡＢＳ用聚丁二烯胶乳（ＰＢＬ）的表观反应速率的影响。     

ABS用聚丁二烯胶乳的合成及应用

重点研究了在歧化松香皂（ＤＲＳ），十二烷基硫酸钠（ＳＤＳ）和间次甲基萘磺酸盐（ＮＦ）组成三元复合乳化剂体系中ＤＲＳ初始用量及补辊方式对聚丁二烯胶乳（ＰＢＬ）粒子形态的影响，结果表明：当ＤＲＳ初始用量为１．２％，在转化率分别为２５％，５０％和７０％，下各补加ＤＲＳ０．４，０．４和０．２份时，可较好地控制ＰＢＬ粒子形态和分布，其平均粒径不小于０．２５μｍ且ＰＢＬ试验重性好，接枝共混合制得ＡＢＳ缺口冲击     

TECHNICAL AND ECONOMIC ASPECTS OF TUNNEL BLASTING ACCURACY CONTROL

ＴＥＣＨＮＩＣＡＬＡＮＤＥＣＯＮＯＭＩＣＡＳＰＥＣＴＳＯＦＴＵＮＮＥＬＢＬＡＳＴＩＮＧＡＣＣＵＲＡＣＹＣＯＮＴＲＯＬ￥ＲｅｎａｔｏＭＡＮＣＩＮＩ（）；ｖａｎｎｔＢＡＤＩＮ０（）；ＮｉｃｏｌａＩＮＮＡＵＲＡＴ０（＊）；ＭａｕｒｏＦＯＲＮＡＲ０（＊），Ｍ...     

PVC／NBR（HNBR）／HDPE共混体系相容性的研究

以丁腈橡胶（ＮＢＲ）和氢化丁腈橡胶（ＨＮＢＲ）共聚物为增容剂，用扫描电镜（ＳＥＭ）对ＰＶＣ／ＨＤＰＥ共混物的形态进行了研究，共聚物ＮＢＲ（ＨＮＢＲ）加入共混物中后，使冲击面形貌发生变化。表明两相间粘合力增大，相分离程度减少小，改变增容剂的种类和用量以及共混组成的，均将对体系的形态结构产生影响。     

聚芳酯／聚酯共混纤维的热分析

利用热分析（ＤＳＣ）的方法对聚（对羟基苯甲酸／６－羟基－２－甲酸萘［ｐ（ＨＢＡ／ＨＮＡ）］／聚对苯二甲酸乙二酯（ＰＥＴ）共混纤维的结构进行了研究。     

PVC／NBR（HNBR）／HDPE共混体系相容性的研究（Ⅱ）增容剂对共混物形态的作用

以丁腈橡胶（ＮＢＲ）和氢化丁腈橡胶（ＨＮＢＲ）共聚物为增容剂，用扫描电镜（ＳＥＭ）对ＰＶＣ／ＨＤＰＥ共混物的形态进行了研究。共聚物ＮＢＲ（ＨＮＢＲ）加入共混物中后，使冲击断面形貌发生变化。表明两相间粘合力增大，相分离程度减小，改变增容剂的种类和用量以及共混组成，均将对体系的形态结构产生影响。     

用于氟化镓铟高数值孔径光纤的氟磷酸盐和氟锆酸盐和氟锆酸盐包 …

为了得到用于１．３μｍ光通讯窗口掺镨化镓铟（ＰＧＩＣＥ）高数值孔光纤，本文报道以ＺｒＦ４－ＢａＦ２－ＬａＦ３－ＡｌＦ３－Ｎａ（Ｌｉ）Ｆ－ＰｂＦ２（ＺＢＬＡＮ（Ｌｉ）Ｐｂ）和ＮａＰＯ３－ＢａＦ２－ＺｎＦ２－ＰｂＦ２（ＦＰＧ）玻璃作为包层材料，研究了芯和包层玻璃在物理性质和化学组分上的匹配性，差热扫描（ＤＳＣ）和电镜（ＳＥＭ）分析表明ＰＧＩＣＺ／ＺＢＬＡＮ（Ｌｉ）Ｐｂ虽在物理性质上匹配，但在化学组分不     

SiC晶须合成中SiC颗粒的生成机理及特性

本文对稻壳合成ＳｉＣ晶须（简称ＳｉＣｗ）的副产品ＳｉＣ颗粒（简称ＳｉＣｐ，牌号ＢＰ）的合成及特性进行了研究，运用ＴＥＭ、ＸＲＤ等分析检测技术，对ＳｉＣｐ的形状、结构、粒度分布等进行了研究。研究表明：ＢＰ－ＳｉＣｐ呈无规则形状，以β－ＳｉＣ为主要晶型。由稻壳生产的ＢＰ－ＳｉＣｐ，粒度小于１０μｍ的占７６％。此外，对ＢＰ－ＳｉＣｐ在复合材料上的应用进行了展望。     

聚碳硅烷／二乙烯基苯的高温裂解

采用ＴＧ－ＤＴＡ、ＩＲ、ＸＲＤ、ＸＰＳ、ＳＥＭ等手段研究了聚碳硅烷（ＰＣＳ）／二乙烯基苯（ＤＶＢ）的高温裂解行为及其裂解产物的结构与性能。结果表明，ＰＣＳ／ＤＶＢ的裂解过程可分成５个阶段，其裂解产物主要由ＳｉＣ、ＳｉＯ２和Ｓｉ－Ｏ－Ｃ非晶网络及游离Ｃ组成，其中游离Ｃ的含量随ＤＶＢ的增加而增加，且对β－ＳｉＣ的结晶有一定的抑制作用，裂解产物的形貌为不发泡的致密结构。     

纳米尺度PS/Ag核壳结构复合球的制备与表征

采用分步法制备了聚苯乙烯/银(PS/Ag)核壳结构复合纳米球。首先采用无皂乳液聚合法并利用丙烯酸(AA)的羧基对制备的PS球进行改性,使其表面带负电荷;然后通过静电吸附作用在改性PS球的表面沉积[Ag(NH3)2]+,水浴(80℃)环境中利用十二烷基磺酸钠(SDS)作为还原剂将PS球表面的[Ag(NH3)2]+还原,制备出PS/Ag核壳结构复合球。通过动态激光粒度分析仪和透射电子显微镜对PS/Ag核壳纳米球的粒度分布、形貌和结构进行了表征,研究了AA的用量对复合球粒径及包覆的Ag壳厚度的影响。结果表明,随着AA用量的增大,所包覆的银层更加致密,厚度增大,当AA用量为15%时可得到Ag完全包覆的PS/Ag复合纳米球。     

Preparation of micron-sized PA6/12 copolymer microspheres via successive in-situ polymerization

Micron-sized polyamide 6/12 (PA6/12) copolymer microspheres were firstly synthesized via successive in-situ polymerization of styrene (free radical polymerization), equimolar Laurolactam (LL) and Caprolactam (CL) (anionic ring-opening polymerization). The resulting PA6/12 microspheres were regular sphericity, with diameter ranging from 9.2 to 138.0 microns and narrow size distribution (size distribution ranging from 1.2 to 3.3), as confirmed by scanning electron microscopy (SEM) and Laser diffraction size Analyzer. Furthermore, the study on the PA6/12 microspheres in PA6/12 and PS (PA6/12/PS) blends confirmed that the particle size distribution, diameter of PA6/12 microspheres were controllable, and closely related to the content of PS in the blends, which indicated that the formation of the PA6/12 microspheres in the PA6/12/PS blends can be elucidated via a phase inversion mechanism.     

Microstructures and Mechanical Properties of TiC_P/Al-4.5Cu-0.8Mg Composites by Direct Reaction Synthesis

Direct reaction synthesis (DRS), based on the principle of self-propagating high-temperature synthesis (SHS), is anew method for preparing particulate metal matrix composites. TiCp/Al-4.5Cu-0.8Mg composites were fabricatedby DRS. Particulate composites were fabricated with Ti carbide (TiC) particles, generally less than 1.0 μm. Thereacted, thermal extruded samples exhibit a homogeneous distribution of fine TiC particles in Al-4.5Cu-0.8Mg matrix.Mechanical property evaluation of the composites has revealed a very high tensile strength relative to the matrixalloy.Fractographic analysis indicates ductile failure.     

Microstructures and Mechanical Properties of TiCp／A1-4.5Cu-0.8Mg Composites by Direct Reaction Synthesis

Direct reaction synthesis (DRS), based on the principle of self-propagating high-temperature synthesis (SHS), is a new method for preparing particulate metal matrix composites. TiCp/Al-4.5Cu-0.8Mg composites were fabricated by DRS. Particulate composites were fabricated with Ti carbide (TiC) particles, generally less than 1.0μm. The reacted, thermal extruded samples exhibit a homogeneous distribution of fine TiC particles in Al-4.5Cu-0.8Mg matrix.Mechanical property evaluation of the composites has revealed a very high tensile strength relative to the matrixalloy. Fractographic analysis indicates ductile failure.     

PVAc／PS／PnBA三元乳胶IPN的合成及相容性研究

用分步乳液聚合法合成了聚醋酸乙烯酯/聚苯乙烯/聚丙烯酸丁酯(PVAc/PS/PnBA)三元乳胶互穿聚合物网络(IPN)。用IR、DMS对体系进行了表征。研究发现,体系中各组分的相容性不好。对相容性较差的原因进行了探讨。     

Modeling of Silver Nanoparticle Synthesis in Ternary Reverse Microemulsion of Cyclohexane/Water/SDS

In the present study, a simple mathematical model has been developed for synthesis of silver nanoparticles. The silver nanoparticles have been synthesized in ternary reverse microemulsion of cyclohexane/water/sodium dodecyl sulfate (SDS). The silver nanoparticles were produced by reaction between silver nitrate in the water droplet core of one microemulsion and hydrazine as reducing agent in the water droplet core of another microemulsion. The dynamic behavior of process was modeled on mass balance equations which were solved using the finite difference method. The kinetic parameters of the critical number size (N _crit ), rate order of nucleation, and growth constants were estimated by minimizing the difference between the average particle size predicted by model and those obtained by experiments. The UV-Vis absorption spectra, transmission electron microscopy (TEM), x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), and dynamic light scattering (DLS) were used to analyze the structure and particle size distribution of silver nanoparticles.     

无皂苯丙乳液的合成及性能研究

在少量甲基丙烯酸钠盐的存在下,成功合成了具有高稳定性、高透明性的聚(苯乙烯／丙烯酸丁酯)P(St／BA)无皂共聚乳液。同时．本文还对不同配方的乳液及其涂膜的综合性能进行了研究,总结了组成与性能之间的对应关系。其中,着重讨论了单体组成与乳液表面能、乳胶粒尺寸之间的关系。结果表明,随单体配比中St含量的增加。乳液接触角和乳胶粒粒径减小。乳胶粒具有均一的尺寸,并显示出明显的核壳结构。本文通过对苯丙无皂乳液组成与性能关系的研究,积累了一定量的理论数据,为无皂乳液产品的进一步开发提供了条件。     

Microstructure and Mechanical Property of in-situ Al-Cu/TiC Composites

An approach named direct reaction synthesis (DRS) has been developed to fabricate particulate composites with an extremely fine reinforcement size. ID situ Al matrix composites were fabri-cated by DRS. Extensive analysis of the composites microstructure using SEM and TEM identify that the reinforcement formed during the DRS process is Ti carbide (TiC) particle, generally less than 1.0 μm. The reacted, semisolid extruded samples exhibit a homogeneous distribution of fine TiC particles in Al-Cu matrix, Mechanical property evaluation of the composites has revealed a very high tensile strength relative to the matrix alloy. Fractographic analysis indicates ductile failure although the ductility and strength are limited by the presence of coarse titanium aluminides (Al3Ti).     

PBA／PS核壳复合胶乳的形态和组成的研究

本文用种子乳液聚合的方法,制备了PBA/PS和PBA/P(S-AA)核壳复合乳液,用电子显微镜观察了核壳复合胶乳的形态,用图象处理系统测定胶乳粒径及其分布,用薄层扫描分离出接技共聚物和测定其组成,并研究了接技共聚物的含量对复合胶乳的稳定性和力学性能的影响。     

Experimental design and multivariate analysis for optimizing poly(D,L-lactide-co-glycolide) (PLGA) nanoparticle synthesis using molecular micelles

The utility of polymeric nanoparticles as drug delivery systems depends on effective control of synthetic parameters with a significant impact on their physico-chemical characteristics. In this study, a chemometric central composite experimental design (CCD) was used to optimize the synthesis of poly(D,L-lactide-co-glycolide) (PLGA) nanoparticles by emulsification solvent evaporation using anionic molecular micelles, such as poly(sodium N-undecylenic sulfate) (poly-SUS), poly(sodium N-undecanoyl-glycinate) (poly-SUG) and poly(sodium N-undecanoyl-L-leucyl-valinate) (poly-L-SULV) as well as conventional emulsifiers, such as anionic sodium dodecyl sulfate (SDS) and non-ionic poly(vinyl alcohol) (PVA). The individual and combined effects of PLGA concentration, emulsifier concentration, homogenization speed, and sonication time (design variables) on particle size and polydispersity index (responses) were investigated using multivariate analysis. The most significant design variables influencing the nanoparticle size and size distribution were PLGA concentration and emulsifier concentration (p < 0.05) in comparison to the other design variables. The quadratic model demonstrated the highest predictive ability when the molecular micelles were used as emulsifiers. The PLGA nanoparticles optimally synthesized according to the CCD were further purified by dialysis and then freeze-dried. Dried nanoparticles synthesized with molecular micelles and PVA were readily re-suspended in water, as compared with SDS for which nanoparticle aggregation occurred. The size of PLGA nanoparticles synthesized using molecular micelles increased after freeze-drying, but remained smaller than 100 nm when poly-L-SULV was used as emulsifier. The PDI values indicated monodisperse nanoparticle suspensions after purification and freeze-drying for all investigated molecular micelles (PDI < 0.100). The nanoparticle suspensions synthesized using molecular micelles were the most stable after dialysis and freeze-drying, having low negative zeta potential values ranging from -54 +/- 1.6 mV for poly-L-SULV to -63.2 +/- 0.4 mV for poly-SUS. Transmission electron microscopy (TEM) micrographs showed spherical shape and smooth surface for the PLGA nanoparticles synthesized using molecular micelles.