有机/高分子光诱导电荷转移材料研究

光诱导电子转移是光电转换体系中发生的一个简单而重要的过程,即:在受到光激发时,一个电子从电子给体(D)转移到电子受体(A)并形成给体自由基阳离子(D·+)和受体自由基阴离子(A·-)的过程.与之相伴的另一个过程是后电子转移过程,即电子重新回到体系的最初状态的过程.为了使放热式电子转移过程顺利进行,最重要的决定因素在于电...     

单轴取向聚乳酸制品的结晶行为研究

借助差示扫描量热仪(DSC)、广角 X 射线衍射仪(WAXD)研究了单轴取向后聚乳酸(PLA)膜片的结晶行为,实验发现,取向后样品的 DSC 曲线在熔融过程出现了2个熔融峰,对应于 WAXD 图谱中29.9°和31.0°这2个晶面衍射峰。结果表明,拉伸取向能够提高制品的结晶度,同时发生晶型转变;当拉伸温度不低于110℃、拉伸倍率不小于400%时,出现了(003)β晶面衍射峰,部分α晶向β晶转变,滑石粉能促进此过程发生,添加1份滑石粉可使 PLA的结晶度从18.5%提高至37.48%。     

环境友好材料特辑可降解高分子材料

综述了可降解高分子材料的研究动态、重点研究内容、评价方法及应用前景,指出了可降解高分子材料存在的问题以及发展方向.     

高分子材料的循环利用

概述了近年来与环境治理的有关的一个重要主题－高分子材料循环利用的发展状况的新型循环技术,同时对高分子材料循环存在的问题,将来的发展趋势和前景作了讨论。     

New Flame-Retardant Polymeric Materials

The production of dibromobutendiol (DBBD) was developed in a wasteless and environmentally friendly way. DBBD is effective as a fire retardant because of the amount of bromine. New unsaturated polyester resin with decreasing flammability was presented. The main monomers were dibromobutendiol and diallylic ether of dibromoneopentylglycol (DAP). Both monomers act effectively against oxygen inhibition, and bromine in their molecules decreased the flammability of obtained products. DAP has been obtained in direct allylation by the use of allyl bromide on the interphase in the presence of proper catalysts—triethylallylammonium chloride. The obtained resins were UV curable. A photocuring system consisting of monoazide or diazide and hydroksyalkylphenone has been applied. The obtaining of new polyurethane foams via reaction of reactive oligomers with DBBD was studied. Well-known difficulties with the solubility of DBBD in polyol systems were solved.     

多功能聚合物电致发光材料

综合有机小分子和聚合物双重优点的多功能聚合物电致发光材料逐渐引起了广泛的关注,作者主要分几种类型对其现状及应用进行简单的介绍。     

On the Theory of NMR Line Shapes in Amorphous Regions of Uniaxially Oriented Polymers

Abstract

A theory of NMR of protons belonging to highly-stretched polymer chains with fixed ends, e.g. tie molecules of amorphous regions of oriented semicrystalline polymers, is presented. Analysis is carried out in terms of the model of freely-jointed chains. All contributions to the line shape from the intramolecular dipole-dipole interactions (DDI) are taken into account. Expressions are derived for the residual time independent component of DDI and the second moments of the fluctuating DDI. The NMR spectra are described in terms of the Anderson-Weiss approximation. A number of spectra are calculated for polyethylene. It is shown that the linewidth of high lemperature spectrum rapidly grows with stretching and approaches that of crystallite polymer. It is demonstrated that the distribution function of tie molecules can, in principle, be obtained from the dependence of the spectra on the stretching ratio.     

生物降解高分子材料的研究进展

简要介绍了生物降解高分子材料的定义、分类和降解机理,较为全面地阐述了当前生物降解高分子材料的应用领域,并对其发展前景作出展望。     

Polymeric Materials with Magnetic Properties

The paper deals with the study of the magnetic properties of some mechanochemically synthesized polychelates. Some spectral analysis methods such as ESR spectroscopy, atomic absorption spectroscopy, and especially Mössbauer spectroscopy are used for this purpose. The presence of metallic atoms (especially Fe) is responsible for the magnetic properties of these mechanochemically synthesized macromolecular compounds.     

无卤生态型阻燃高分子材料

综述近几年各国研制成功的一些无卤阻燃高分子材料 ,包括无卤生态型阻燃PC、PC/ABS及改性PPO ,无卤阻燃PA及无卤阻燃涂料。这些无卤阻燃材料大多适用于电子 电气行业     

高分子材料抗静电技术

介绍了静电的产生、危害及其防止的方法,重点评述了高分子材料抗静电技术的研究进展.     

高分子阻尼材料的研究进展

介绍了高分子材料的阻尼原理和评价方法,综述了高分子阻尼材料的最新研究进展,讨论了设计制备高性能阻尼高分子材料的原理和方法。     

The Coloration of Synthetic Polymeric Materials

Two very interesting and successful innovations were the running of simultaneous sessions on the Thursday morning—one on dyeing theory and the other on dyeing practice—and the introduction of a panel discussion on the Friday afternoon.     

试论导热高分子材料的实践应用

随着现代工业和材料科学的不断发展,对导热高分子材料提出了更高的要求。从导热高分子材料概述入手,探讨导热高分子材料的实践应用,以供参考。