可降解生物医用高分子材料的应用研究

生物医用材料是新时期临床治疗中较为常用的一种功能性材料,能够满足组织器官修复等的需要,在使用中危害性较小,不会对人体产生过多影响,因此在医学研究等相关工作中具有独特优势,成为新时期医学研究的重点。与其他类型材料相比,可降解生物医用高分子材料性能更稳定,能够满足不同场景下的使用需求,所以被广泛应用于新时期临床诊疗工作中。从这一角度出发,本文深入分析了可降解医用高分子材料的特点和常用类型,探索了可降解生物医学高分子材料的实际应用途径,为行为提供参考。

巨磁阻高分子复合材料的研究进展

传统巨磁阻(GMR)材料广泛应用于生物检测、磁记录与储存、汽车转速传感器、高效电磁屏蔽/吸收材料等领域。由于具有易加工、高柔韧性等优点,GMR高分子复合材料近年来备受关注。文中介绍了涂层型、聚苯胺型、磁性纳米粒子填充型GMR高分子复合材料的制备、结构与性能,在分析制备方法对GMR性能影响的基础上,提出今后GMR高分子复合材料研究的重要方向,重点评述磁致结构化复合材料粒子相结构-熔体流变行为-凝聚态GMR性能关系,开发低填充、大GMR效应复合材料结构、性能的调控方法以及高稳定柔性GMR元器件的制作方法。

超轻发泡TPU颗粒材料在鞋材上的应用

随着生活水平的改善,人们对鞋子的舒适性提出了更高的要求,泡沫鞋底材料的研发也不断取得进展,逐步向新型材料的应用和环保方向发展。TPU(热塑性聚氨酯弹性体)是第4代的鞋底原料,其拥有更好的弹性和弯曲性,适用于各类特种鞋,如足球鞋、登山鞋等。但TPU也有不足之处,如硬度较大、吸震能力较差等,提高TPU鞋底的综合性能是目前TPU鞋底产业的一个重要课题。文章对一种新型超轻泡沫TPU粒子的合成工艺进行了研究,并对其在鞋类制品中的应用和性能进行了分析。以供参考。

Vertical drainage capacity of new electrical drainage board on improvement of super soft clayey ground

As an advanced polymer composites electro-kinetic geosynthetics, the electro-osmotic vertical drainage(EVD) board could drain water quickly and accelerate consolidation process. However, the drainage rate was mainly impacted by the vertical drainage capability. Therefore, vertical drainage capability at the top of EVD board was theoretically analyzed. Basic requirements for drainage at the top of the board were summed up, as well as the formula of anode pore pressure when losing the vertical drainage capability. Meanwhile, a contrast test on the top and bottom drainage capacities was conducted. In use of the advanced EVD board, the voltage potential and pore pressure of anode were measured. Moreover, the derived formulas were verified. The result shows that the decrease of electric force gradient had an observable impact on the drainage capability. There was nearly no difference between the energy consumption for the two drainage methods. Although a little less water was discharged, the top drainage method had more advantages, such as high initial drainage velocity, few soil cracks, low anode water content and high soil strength. All of these show that the super soft soil ground could be consolidated quickly in use of the advanced EVD board through the top drainage. The top drainage method could efficiently improve the drainage effect, decrease the energy consumption and speed up the project proceeding.

The latest progress in research of plastics processing technology

According to the great demand for the＂ green＂ plastics processing technology of the low energy consumption, high efficiency and environmental protection in plastics industry, the plastics processing method and technology based on the elongation rheology, with continuing evolution and innovation of the plastics plasticating and conveying method, are presented and researched on the basis of the plastics dynamic processing method arid equipment, and the plastics plasticating and conveying process in the vane extrusion system, the technical characteristics and the applications of vane plasticating and conveying technology are discussed. The research results show that compared with the conventional processing equipment, this new technology and equipment shows many outstanding advantages, such as shortening the thermo-meehanical history of the plastics processing by more than 50 % , reducing the energy consumption by 30 % or so, improving the mixing and blending effects, improving the quality of the products and the adaptability to materials, etc. , and it is found that the new technology and equipment has special superiority in the fields of the processing for material systems, such as the multiphase and multicomponent composite materials, the shear heat sensitive macromolecular materials, etc.

Timing Belts Dynamics Model Approach

Design of composites and usage of new polymer materials allows for improvement of constructional properties of belts. Different applications： transmission, conveying or controlling have different meshing in gear. The work presents meshing model between timing belt and pulley and constructional features of transmission timing belts depending on materials used for their production. While designing timing belt, much attention should be paid to selection of materials, which has significant influence on mechanical properties of belts. This paper attempts to identify the model material and the nature of cooperation of timing belt-pulley; this is basic knowledge for the development of timing belt gear.

Side-chain engineering of high-efficiency conjugated polymer photovoltaic materials

In recent years,conjugated polymers have attracted great attention in the application as photovoltaic donor materials in polymer solar cells(PSCs).Broad absorption,lower-energy bandgap,higher hole mobility,relatively lower HOMO energy levels,and higher solubility are important for the conjugated polymer donor materials to achieve high photovoltaic performance.Side-chain engineering plays a very important role in optimizing the physicochemical properties of the conjugated polymers.In this article,we review recent progress on the side-chain engineering of conjugated polymer donor materials,including the optimization of flexible side-chains for balancing solubility and intermolecular packing(aggregation),electron-withdrawing substituents for lowering HOMO energy levels,and two-dimension(2D)-conjugated polymers with conjugated side-chains for broadening absorption and enhancing hole mobility.After the molecular structural optimization by side-chain engineering,the2D-conjugated polymers based on benzodithiophene units demonstrated the best photovoltaic performance,with powerconversion efficiency higher than 9%.

Flame retarded polymer nanocomposites: Development,trend and future perspective

Polymer nanocomposites are a new class of flame retarded materials which have attracted much attention and considered as a revolutionary new flame retardant approach.A very small amount of nano flame retardants (normally < 5 wt%) can significantly reduce the heat release rate (HRR) and smoke emission (SEA) during the combustion of polymer materials.Moreover,the addition of nano flame retardants can also improve the mechanical properties of polymer materials compared with the deterioration of traditional flame retardants.This paper reviews the recent development in the flame retardant field of polymer nanocomposites and also introduces the related research in our lab.The challenges and problems are discussed and the future development of flame retarded polymer nanocomposites is prospected.

Highly oxidized graphene with enhanced fluorescence and its direct fluorescence visualization

We prepared hyper-oxidized graphene(HOG) as a form of graphene derivative by additional oxidation of graphene oxide(GO) sheets. HOG, which formed more functional groups and isolated conjugated clusters on the sheets, accordingly showed high solubility in water and alcohols, high transmittance and film transparence, longer fluorescence decay constant time, and enhanced fluorescence in states of solution and solid. By contrast, GO has much weaker fluorescence in solution and its fluorescence is totally quenched in solid. The influences of concentration, metallic ions, and pH on HOG fluorescence in aqueous solution were also investigated in detail. Due to HOG's strong fluorescence, direct visualization was realized on substrates and in solution. In addition, direct 3D fluorescence visualizations of HOG phase in polymer composites were achieved. These results show the great potential of HOG in a broad range of applications, from biological labeling, probes, and drug carriers to highperformance composites and nanomanipulation.

Selective Gold Deposition on a Nanostructured Block Copolymer Film Crystallized by Epitaxy

An ordered nanostructure formed by epitaxial crystallization of a semicrystalline block copolymer on a substrate has been used as a patterned template for the selective deposition of thermally evaporated gold nanoparticles, resulting in the formation of structure-guiding host nanocomposites in which the ordered distribution of the guest particles is guided by the ordering of the host nanostructured block copolymer matrix. This opens new perspectives in the field of polymeric composites related to the maximum enhancement of effective physical properties and to the numerous possible applications that arise due to the presence of long-range order in the spatial distribution of functional nanoparticles.