HDPE/SBS共混改性吹塑薄膜取向性的研究

采用相差显微镜和电子显微镜观察了HDPE/SBS共混改性吹塑薄膜的取向,并用双折射、广角X光衍射和红外光谱等仪器测量和分析了随SBS含量的变化,对共混改性薄膜取向性的影响。结果表明:SBS的加入减缓了HDPE/SBS吹塑薄膜的取向程度,并且发现随SBS含量的增加,共混体系中各组分的取向变化趋势是不一样的,其中PE部分的取向程度逐渐减少,SBS中的PS段的取向程度反而有所增加,而PB段的取向程度几乎没有变化。此外,对SBS缓解薄膜取向的机理进行了探讨,并讨论了薄膜的取向与机械性能的关系。     

溅射技术在制备SiC薄膜中的应用

近20年以来，薄膜科学得到迅速发展，不仅得益于薄膜材料可能具有力、热、光、电、磁、仿生或化学等各种特性，可以使器件小型化，而且也得益于各种薄膜制备手段的进步．其中，溅射技术已成为几种重要的制备薄膜的手段之一．广泛应用于制备超硬涂层、耐磨涂层、耐腐蚀涂层以及具有电学、光学、半导体等性质的薄膜，SiC薄膜就是其中很有发展前景的一种．本文将介绍溅射原理、薄膜制备技术，着重介绍溅射法在制备SiC薄膜中的应用和前景展望。     

《JOURNAL OF WUHAN UNIVERSITY （Natural Science Edition） 》Vol.49 No.6，2003 Abstract

Polyaniline (PAn) film was synthesized onto electrode surface modified with a self-assembled monolayer (SAM) of Glutathione (GSH), while copper was deposited in defects of PAn film simultaneously.The resulted PAn films were characterized by means of cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM). The results show that there could be the copper ions‘ route in PAn films, which make easier adulteration of copper ion into the PAn film phase. It was found that the redox peaks of PAn were relevant to the doping of anions and to the adulteration of copper ion.     

Second Shape Finding Analysis of Membrane Structures

A second shape finding method was developed to improve the nonlinear finite element based shape finding method. The curved shape is obtained by raising the control points above the projection planeThe convergence was improved using pseudo material properties to get a preliminary shape, and then using the real properties to get the final shape. A large number of examples were analyzed to verify the validity and practicality of this method. The results show that the final curved surface after the second shape finding process is always quite similar to the first one. Moreover, the curved surface obtained after the second shape finding process is accurate and will be realized in real materials.     

富勒烯薄膜的波导Raman散射增强效应

以C_(60),C_(70)为代表的富勒烯材料,自Kr(?)tschmer等人发现其有效制备方法之后,已成为材料科学研究的热点之一,被认为在半导体、超导体、有机导体、非线性光学、金刚石薄膜合成、有机化学、医药、润滑等方面有着巨大的潜在应用价值.尤其是作为一种新型光学材料而倍受人们关注.C_(60)由于具有共轭大π电子云体系而表现出强烈的三阶非线性光学效应,使其有可能成为十分有前途的非线性光学材料,而其反饱和吸收特性则使其可以制成光限幅器件、光双稳器件和全光学开关等.本文研究了沉积于粗糙介质表面C_(60)薄膜的波导Raman散射(waveguide Raman scattering).波导Raman散射是结合集成光学和Raman散射的一种测试介质上薄膜性能的灵敏方法,文献[4]报道了C_(60)薄膜的波导Raman散射现象,但是用的光源为100mW的Ar~+激光.然而,这种较强的激光有可能破坏C_(60)膜中的分子结构诸如发生聚合反应等,从而影响其本征的Raman谱.本文报道了采用30mW的He-Ne激光为激发光源,观察到粗糙介质表面C_(60)薄膜的波导Raman散射增强效应.