复合胺改性尼龙6的动态流变性能研究

在己内酰胺水解聚合时加入一定量的复合受阻胺，合成出含有复合胺的改性尼龙6树脂，研究了复合胺对尼龙6熔体的动态流变性能的影响。实验表明：随着剪切频率的增加，尼龙6熔体的复数粘度减小、储能模量和损耗模量均增大；但由于复合胺的加入，在尼龙6大分子链上引入了空间位阻基团，复合胺改性尼龙6熔体的复数粘度、储能模量及损耗模量均比未改性样增大；改性前后尼龙6的损耗因子均随剪切频率的增加呈现先增加后减小的变化趋势，在频率为18 rad／s的位置出现极大值——内耗峰，但改性尼龙6的峰值更大；改性前后尼龙熔体的lgG′～lgG″曲线均在对角线右下方，随复合胺的加入，曲线向右下方位移增大，熔体的粘性响应更明显。     

BLOOD VISCOELASTICITY FOR CONDITIONS OF PHYSIOLOGICAL FLOW IN SMALL ARTERIES

The viscoelasticity of blood is quantified by studying the oscillatory flow of suspensions of RBC in plasma in 218 μm and 400 μm glass capillary tubes. The flow conditions are chosen to reflect normal physiological flow in small arterial vessels. Data are obtained for suspension hematocrits between 35 and 80 percent, and at physiological temperature (37°C) The results indicate that the elastic component of the viscoelasticity of blood is effectively negligible for the conditions of this study; the measured pressure gradient-flowrate relationship is dominated by the viscous component of blood viscoelasticity.     

(1-x)NBT-xBaTiO3系陶瓷材料制备过程中烧成工艺制度的研究

选取BT6组成点,采用不同的预合成温度、烧结温度和保温时间制备样品,研究各样品的体积密度、线收缩率、晶粒发育状况和压电性能,确定最佳的烧成工艺制度。     

POE-g-GMA对聚丙烯／聚磷酸铵复合材料玻璃化转变活化能的影响

以熔融反应挤出得到的POE-g-GMA作为增容剂，制备了增韧PP／APP复合材料。采用动态力学的方法，计算得到不同POE-g-GMA含量的PP／APP复合材料的玻璃化转变活化能。结果表明，在相同的测试频率下，接枝物POE-g-GMA的加入会导致PP／APP复合材料的内耗峰的峰温降低，而内耗峰的强度增加；降低复合材料的玻璃化转变活化能。这说明在PP／APP复合体系中加入POE-g-GMA可以改善PP和无机填料APP之间的相容性，使复合材料中的PP分子链段在进行玻璃化转变时更加容易。只需要较低的活化能就可以了。从中可以判断出接枝物POE-g-GMA对于PP／APP共混体系来说是很好的相容剂。     

高聚合度PVC／TPU共混物的制备与研究

本文研究了采用高聚合度聚氯乙烯(PVC)和热塑性聚氨酯(TPU)为主体材料制备高聚合度PVC/TPU共混物的过程,讨论了高聚合度PVC/TPU并用比、填料、增塑剂、共混工艺等因素对高聚合度PVC/TPU共混物性能的影响。     

NCT-11型有机硫水解催化剂的研制

介绍了NCT－11型有机硫水解催化剂实验室研制情况。结果表明，在240～280℃时，该催化剂对气体中的COS有优越的水解性能。在280℃、1200h-1、进口COS—2000ｘ10-6　条件下，水解转化率＞90％。     

Comparison of YAG: Eu phosphors synthesized by supercritical water in batch and continuous reactors

Luminescent yttrium aluminum garnet (YAG, Y₃Al₅O₁₂) nanoparticles doped with Eu (10 at%) were synthesized in batch-type and continuous-type supercritical water (SCW) reactors. In the case of the continuous-type SCW method, the particles of YAG: Eu phosphors were much smaller and demonstrated a uniform spherical-like shape. Inversely, in the case of the batch-type SCW method, a needle-like or elliptical-like shape was formed because a finite amount of time was required to reach SCW conditions from ambient conditions. However, the emission intensity of YAG: Eu phosphors synthesized by using the batch-type SCW method was stronger. Therefore, it is concluded that the continuous-type SCW method is superior to the batch-type SCW method from the viewpoint of the particle size and shape, but the luminescence property of phosphors in the continuous-type SCW method needs to be improved. In addition, a calcination process slightly improved the luminescence intensities of YAG: Eu phosphors generated by using either the batch-type or continuous-type SCW methods.     

Phase inversion and its effect on the properties of polyester polyurethane cationomers

Polyester polyurethane cationomers are prepared using polyester polyol of molecular weight 2000 as soft segments, N-methyl diethanolamine as chain extender, glycolic acid as quaternization agent, methyl ethyl ketone as solvent, and 4,4'-diphenylenemethylene diisocyanate (MDI) as diisocyanate. Properties of the films cast from solutions and emulsions are studied by infrared spectroscopy, dynamic mechanical analysis, thermogravimetric analysis, differential scanning calorimetry, and tensile-elongation testing. Ionization can cause phase separation and produces increased cohesion in the hard domains. The dispersion process can be divided into three stages involving a separation of hard segment aggregates due to adsorption of water on their surface, water entering into hard segment microionic lattics, and finally a rearrangement of agglomerates to form microspheres. The dispersion can disrupt the order in the hard domains and an increased phase separation.     

纳米载体铜基催化剂对低碳醇合成的影响

本文用沉积-沉淀法制备了新型纳米载体低碳醇合成催化剂，并与共沉淀法所制备的催化剂进行了对比，结果表明，纳米载体催化剂活性高、耐热性能好、醇收率高纳米载体对纳米载体催化剂活性大小的影响顺序为：纳米Al2O3＞纳米ZnO-ZnAl2O4＞纳米MgAl2O4＞纳米MgO.工艺参数对反应性能的影响结果表明，反应温度低，甲醇选择性高；但温度太高（＞320℃）CO2。选择性升高，且整个反应为动力学控制；压力升高可提高活性和C1-C2OH选择性，但C4OH选择性下降；结合空速对产物分布的影响，反应可能按Smith和Anderson的缩聚机理进行．     

机械力化学改性硅灰石/聚丙烯性能的研究

利用气流磨对硅灰石进行机械力化学改性，并用IR分析对改性效果进行了预评价；对比了用改性前后的硅灰石填充聚丙烯(PP)的性能。结果表明：改性后硅灰石分别为由亲水疏油性变为亲油疏水性；硬脂酸质量分数为1．5％时，改性硅灰石／PP复合材料的拉伸强度和冲击强度最好。