钛酸酯偶联剂在无机填料中的应用

简要介绍了钛酸酯偶联剂在无机填料中的用法和适用范围。并介绍了钛酸酯偶联剂的两种偶联机理 (化学键理论和配位理论 )和基于这两种机理的偶联剂和无机填料之间的用量关系式     

簇状羟基锡酸锶的合成及对软聚氯乙烯的阻燃消烟作用

以锡酸钠和硝酸锶为原料,制备了花簇状羟基锡酸锶(SrSn(OH)_6);将其添加到软聚氯乙烯(PVC)中,采用极限氧指数仪、烟密度等级测试仪、拉伸仪和热重分析仪研究了其对软PVC的阻燃、抑烟、拉伸和热降解性能的影响,并通过能谱分析、X射线衍射和扫描电镜对烟密度等级测试后残炭的组成及形貌进行表征。结果表明,SrSn(OH)_6对软PVC具有较好的阻燃和抑烟性能,对其拉伸性能的影响较小;当其添加量为10 g/100 g PVC时,其对应的阻燃软PVC具有最好的阻燃、消烟和拉伸性能;SrSn(OH)_6能促使软PVC燃烧时迅速脱出HCl并交联形成内部具有封闭孔的,外表面致密的膨胀炭层。     

施主掺杂BaTiO3陶瓷临界浓度的理论计算

空气中烧结各种施主掺杂的BaTiO3陶瓷时,存在一种电阻率反常现象.从热力学以及晶体结构化学的角度出发,对临界施主掺杂浓度进行了理论计算和推导.结果表明:释放氧所需的能量与施主离子的种类无关,因而临界施主掺杂浓度为一定值;临界掺杂浓度时的晶粒尺寸越小,在晶粒重结晶过程中临界施主掺杂浓度就越大.     

老柞山地区饮用天然矿泉水特征及其开发利用前景

以老柞山金矿区勘探时的水质分析资料及其水源地运气河一带的水质分析资料为依据,参照国际饮用天然矿泉水标准提出了3种矿泉水类型,指出了各类型矿泉水的分布及其特征,并重点介绍了偏硅酸一锶饮用天然矿泉水的水化学特征,可作为今后开发本区矿泉水资源的依据。     

热压铸法制造石英钟钟表磁环的工艺研究

介绍了用热压铸法制造石英钟钟表磁环的工艺实验,确定了其最佳制造工艺方案,选择了最适宜的磁性粉,同时制造了简单而实用的充磁工装．     

Development of Methotrexate Complexes Endowed with New Biological Properties Envisioned for Musculoskeletal Regeneration in Rheumatoid Arthritis Environments

Methotrexate (MTX) administration is the gold standard treatment for rheumatoid arthritis (RA), but its effects are limited to preventing the progression of the disease. Therefore, effective regenerative therapies for damaged tissues are still to be developed. In this regard, MTX complexes of general molecular formula M(MTX)·xH₂O, where M = Sr, Zn, or Mg, were synthesized and physicochemically characterized by TGA, XRD, NMR, ATR–FTIR, and EDAX spectroscopies. Characterization results demonstrated the coordination between the different cations and MTX via two monodentate bonds with the carboxylate groups of MTX. Cation complexation provided MTX with new bioactive properties such as increasing the deposition of glycosaminoglycans (GAGs) and alternative anti-inflammatory capacities, without compromising the immunosuppressant properties of MTX on macrophages. Lastly, these new complexes were loaded into spray-dried chitosan microparticles as a proof of concept that they can be encapsulated and further delivered in situ in RA-affected joints, envisioning them as a suitable alternative to oral MTX therapy.     

纳米钛酸锶钡粉体的熔盐法制备

以TiO2、BaCO3和Sr(NO3)2为原料,KNO3和KOH为熔剂,利用熔盐法分别在650,750℃下,制备了钛酸锶钡(BaxSr1–xTiO3,简称BST)纳米粉体。研究了不同温度和不同熔盐的配比条件下BST粉体的生长特征。结果表明,熔盐配比和温度的影响显著。当ζ(KNO3∶KOH)为15∶1时,在750℃下反应3h可形成单一相的BST纳米粉体,晶粒度为42nm;当其为9∶1时,在650℃下反应5h便可形成单一相的BST粉体,晶粒度为89nm。     

掺锶碱硬锰矿固溶体的制备

以碳酸锶(SrCO3),碳酸钡(BaCO3)、氧化铝(Al2O3)和二氧化钛(TiO2)为原料,通过配方设计,用高温固相反应合成掺锶(Sr)硬锰矿固溶体.借助热重-差热分析、X射线衍射仪、扫描电镜和波谱分析仪等分析手段,研究了碱硬锰矿固溶体的合成温度、物相组成以及晶粒的化学计量.研究表明:合成单相碱硬锰矿固溶体和单相掺Sr碱硬锰矿固溶体的配方分别为Ba1 xAl2 2xTi6-2xO16,SrxBa1Al2 2xTi6-2xO16.单相掺Sr碱硬锰矿固溶体的最低合成温度为1 250℃左右;最佳合成温度为1 300℃.     

In Vitro and In Vivo Evaluation of Injectable Strontium-Modified Calcium Phosphate Cement for Bone Defect Repair in Rats

Calcium phosphate cement (CPC) has been widely studied, but its lack of osteoinductivity and inadequate mechanical properties limit its application, while strontium is able to promote bone formation and inhibit bone resorption. In this study, different proportions of tristrontium silicate were introduced to create a novel strontium-modified calcium phosphate cement (SMPC). The physicochemical properties of SMPC and CPC were compared, and the microstructures of the bone cements were characterized with scanning electron microscopy assays. Then, the effect of SMPC on cell proliferation and differentiation was examined. Furthermore, local inflammatory response and osteogenesis after SMPC implantation were also confirmed in the study. Finally, a rat model of isolated vertebral defects was used to test the biomechanical properties of the cements. The results showed that SMPC has better injectability and a shorter setting time than CPC. Meanwhile, the addition of tristrontium silicate promoted the mechanical strength of calcium phosphate cement, and the compressive strength of 5% SMPC increased to 6.00 ± 0.74 MPa. However, this promotion effect gradually diminished with an increase in tristrontium silicate, which was also found in the rat model of isolated vertebral defects. Furthermore, SMPC showed a more preferential role in promoting cell proliferation and differentiation compared to CPC. Neither SMPC nor CPC showed significant inflammatory responses in vivo. Histological staining suggested that SMPCs were significantly better than CPC in promoting new bone regeneration. Importantly, this osteogenesis effect of SMPC was positively correlated with the ratio of tristrontium silicate. In conclusion, 5% SMPC is a promising substitute material for bone repair with excellent physicochemical properties and biological activity.     

各向异性永磁锶铁氧体的晶粒取向与磁性

用SEM、TEM和磁性测量等手段分析了各向异性烧结SrFe₁₂O₁₉的晶粒取向对宏观磁性能的影响.结果表明,锶铁氧体磁粉中有废磁体经破碎、球磨后成粉状的SrFe₁₂O₁₉针状颗粒,沿C轴方向整齐排列,对产品质量无害.烧结SrFe₁₂O₁₉磁体中,颗粒呈六角型,其取向度越高,磁性越好.取向磁场的大小和添加剂的加入量对SrFe₁₂O₁₉磁体的取向度和磁性有着显著的影响.