Morphology,thermal stability,and flammability of polymer matrix composites coated with hybrid nanopapers

In this study, a hybrid nanopaper consisting of carbon nanofiber (CNF) and polyhedral oligomeric silsequioxane (POSS) or cloisite Na⁺ clay, has been fabricated through the papermaking process. The hybrid nanopaper was then coated on the surface of glass fiber (GF) reinforced polymer matrix composites through resin transfer molding (RTM) process. The morphologies of the hybrid nanopaper and resulting nanocomposites were characterized with scanning electron microscopy (SEM). It can be seen that the nanopaper had a porous structure with highly entangled carbon nanofibers and the polyester resin completely penetrated the nanopaper throughout the thickness. The thermal decomposition behavior of the hybrid nanopapers and nanocomposites was studied with the real‐time thermogravimetric analysis/ flourier transform infrared spectrometry (TGA/FTIR). The test results indicate that the addition of pristine nanoclay increased the thermal stability of the nanopaper, whereas the POSS particles decreased the thermal stability of the nanopaper. The fire retardant performance of composite laminates coated with the hybrid nanopaper was evaluated with cone calorimeter tests using a radiated heat flux of 50 kW/m². The cone calorimeter test results indicate that the peak heat release rate (PHRR) decreased dramatically in composite laminates coated with the CNF‐clay nanopaper. However, the PHRRs of the CNF‐POSS nanopaper coated composite laminates increased. The formation of compact char materials was observed on the surface of the residues of the CNF‐clay nanopaper after cone calorimeter test. The flame retardant mechanisms of the hybrid nanopaper in the composite laminates are discussed. Copyright © 2009 John Wiley & Sons, Ltd.     

THE MACQM CALCULATION OF THE TOTAL ENERGY CURVE OF THE BODY-CENTERED CUBIC STRUCTURE OF THE H_9~- CLUSTER

ＴＨＥＭＡＣＱＭＣＡＬＣＵＬＡＴＩＯＮＯＦＴＨＥＴＯＴＡＬＥＮＥＲＧＹＣＵＲＶＥＯＦＴＨＥＢＯＤＹ－ＣＥＮＴＥＲＥＤＣＵＢＩＣＳＴＲＵＣＴＵＲＥＯＦＴＨＥＨ－９ＣＬＵＳＴＥＲＧｏｕＱｉｎｇｑｕａｎＺｈａｎｇＪｉａｎｐｉｎｇＬｉＰｉｎｇＩｎｓｔｉｔｕ...     

中国人CD59cDNA克隆、序列分析及其表达

用ＲＴ－ＰＣＲ方法从中国人胚胎总ｍＲＮＡ中扩增出４２０ｂｐ人补体终末阶段同源限制因子（ＣＤ５９）的ｃＤＮＡ，序列分析结果表明，所获得的ＣＤ５９ｃＤＮＡ与文献报道中的基因序列完全一致，含ＣＤ５９全长编码区．构建了真核表达质粒，在３Ｔ３细胞中得到了表达．     

金、铜、铂、银表面光学二次谐波参数的研究

以1.06μm激光为基频光,测量了金、铜、铂、银膜的反射二次谐波随基频光偏振角的变化,在b=-1的条件下拟合求得了这几种样品面谐波电流的唯象参数“a”值。     

30MeV/u 40Ar引起的反应中核温度参数的提取

利用同位素产额比方法,提取了30MeV/u ⁴⁰Ar轰击⁵⁸Ni,⁶⁴Ni和¹¹⁵In的反应中中等质量碎片(IMFs:3≤Z≤8)的发射体的核温度参数,给出了“表观”温度与一些物理量的依赖关系以及对边馈(side-feeding)效应的影响进行修正后的温度参数. 并就此进行了简单的讨论.     

H9^＋团簇的体心立方结构与能量的理论计算

此文利用单电子在中心氢原子核与周围每个氢原子核之间形成单电子键的共振模型来划分通道，将改进的排列通道量子力学方法推广应用于Ｈ９＋的体心立方结构与能量的理论计算。结果发现，当中心与周围顶角问距Ｒ０＝１．９０ａ０时，总能量有一极小值－４．３０８ｈ．ａ．ｕ，表明Ｈ９＝的体心立方结构是稳定存在的。此外，Ｈ９团簇电离时体积要发生膨胀，大约膨胀到原来的１．５倍。