阻燃剂FR-421的研制

磷酸酯齐聚物是一种高分子聚合物阻燃剂，它具有分子量高、蒸汽压低、迁移性小、耐久性好、毒性低、多功能等特点，可用于PE、ABS、PET、SAN、PP等合成材料的阻燃。     

常见ABS树脂的性能对比

立足于传统力学性能仪器与先进的光学性能仪器、热分析仪等，分析对比了部分通用ABS树脂与挤出品级ABS树脂本身的性能特点和相互之间的差异，目的是对中油ABS树脂品牌的状况以及同先进公司品牌相比存在的差距进行分析认识。结果表明，中油通用ABS树脂三大牌号的性能特点各异，但与奇美公司的产品相比，主要是外观不足，其次在挤出品级领域牌号的特点并不明显，同级相比，相对分子质量和冲击强度偏低。     

不同粒径氧化镁对ABS导热塑料热导率的影响

以氧化镁、丙烯腈-丁二烯-苯乙烯共聚物（ABS）为原料，通过共混、模压法制备了ABS导热塑料。研究发现氧化镁填充量受粒径影响很大。大粒径氧化镁可以填充到600份，而小粒径氧化镁最高只可达400份。在300份时，小粒径氧化镁填充的导热ABS具有较高的热导率。采用渗滤理论分析热导率与填充体积分数的关系，发现大粒径氧化镁填充的ABS导热塑料在300600份范围内很好的符合临界体积分数（Фc）为0．198的面心立方场点渗滤的渗滤理论。SEM观察到了大粒径氧化镁填充ABS导热塑料中氧化镁颗粒连通的导热路径；小粒径氧化镁填充的ABS导热塑料在所研究范围内受界面热阻影响，不符合渗滤理论。采用大小粒径氧化镁复配，由小粒径氧化镁填充到大粒径氧化镁导热网络中的空隙可得更好的导热性能。     

附聚胶乳接枝工艺的开发

本文通过研究实验过程中的工艺条件，考察了接枝工艺及接枝效果对ABS树脂性能产生的影响。通过实验确定了附聚胶乳接枝工艺，该工艺所得到的胶粉小粒径较少，接枝率、接枝效率均能满足生产需求，经掺混后得到的ABS树脂，冲击明显优于目前成品，可用于高抗冲ABS树脂。     

改性TPU耐磨密封材料

改性TPU耐磨密封材料及其制备方法与用途，采用TPU颗粒料与ABS颗粒料混合，利用TPU材料耐磨性能优良、弹性和柔软性好，以及ABS材料硬度高、刚性好的特点，将两种材料通过合理的搭配，通过TPU粒料加ABS粒料、共混造粒、干燥、模压选出适合海水水泵轴套使用的密封材料，具体材料的组成和重量份配方为：TPU粒料100份、ABS粒料20—35份、超细（UF）微粉0—15份。     

板材级ABS树脂的研究开发

分析了板材级ABS树脂与通用级ABS树脂的差别,研究开发了新的板材级ABS树脂。通过产业化合成特种SAN,在小试、中试开发板材级ABS树脂的基础上,开发了产业化生产板材级ABS树脂的技术。     

板材级ABS的产品性能及挤出成型工艺研究

对比并分析了国内市场常用板材级ABS树脂与通用级ABS树脂的性能特点，介绍了挤出板材的工艺流程和工艺条件，并对ABS板材挤出成型工艺的影响参数及控制要点进行了讨论，分析探讨了AgS板材从粒料干燥到板材冷却定型的各种工艺参数、影响因素及其控制要点，归纳总结了挤出成型ABS板材的各种质量缺陷、产生原因及其相应的对策措施。     

国内快讯

高桥石化公司建ABS装置目前 ,我国已成为世界上ABS树脂的最大消费国 ,2 0 0 2年总需求量达 2 15万t ,进口量为 163万t。为缓解国内对ABS树脂的需求 ,高桥石化公司引进国际先进技术 ,将在上海漕泾化学工业区建设 2 0万t/a的ABS生产装置 ,项目总投资为 15 6亿元 ,将于今年 10月开工建设 ,2 0 0 6年 3月建成投产。2 0万t/a的ABS项目引进世界上最先进的ABS生产技术 ,采用美国DOW化学公司的连续本体法工艺 ,具有工艺技术先进、生产流程短、占地小、投资低、污染少、装置规模经济等特点。用此工艺生产的ABS产品色泽纯正 ,有很好的自着…     

ABS树脂生产技术与市场现状

介绍了ABS树脂生产工艺分类及技术特点，综述了国内外产能产量，分析了近五年国内ABS树脂产能产量、进出口情况以及市场供需情况，并对下游消费领域做了分析与预测。     

吹塑ABS熔体强度的影响因素

本文系统地研究了吹塑ABS熔体强度的影响因素——橡胶含量、橡胶粒径和SAN分子量。通过流变测试,发现高橡胶含量对ABS熔体强度影响不明显,小橡胶粒径及大分子量SAN可显著提高ABS的熔体强度。并通过熔垂实验,获证小橡胶粒径及大分子量SAN的ABS的耐熔垂性能优越。     

Influence of processing routes on morphology and low strain stiffness of polymer/nanofibrillated cellulose composites

Abstract

The morphology of polymer/nanofibrillated cellulose (NFC) composite sheets produced using different techniques and its influence on low strain stiffness were assessed by optical and transmission electron microscopy. Solvent processing led to relatively homogeneous NFC dispersions and significant reinforcement of the in-plane Young’s modulus. The continuous cellular networks obtained by wet comingling of polylactide powder or latex with NFC also provided efficient and essentially scale independent reinforcement, in spite of the extensive agglomeration of the NFC. However, the irreversible nature of these networks is incompatible with low pressure thermoplastic processing routes such as physical foaming, and while they may be broken up by e.g. extrusion, this led to substantial loss in reinforcement, particularly at temperatures above the glass transition temperature of the matrix, consistent with the observation of isolated low aspect ratio NFC aggregates in the extruded specimens.     

Processing and mechanical properties of hydroxyapatite–polysulfone laminated composites

Designing biocomposites that mimic bone with specific mechanical properties of toughness and elastic modulus is a long-standing challenge in the biomaterials field. Traditional biocomposites comprise polymer matrices reinforced with ceramic particles. Laminated composites are structures also found in nature that can offer improved mechanical properties such as strength, elastic modulus and toughness. Hydroxyapatite/polysulfone laminated composites were fabricated to develop biologically compatible, toughened composites that would match the elastic modulus of bone. Multilayered composites were successfully designed with improved toughness measured by the work of fracture. Toughness measurements were more than an order of magnitude greater than monolithic hydroxyapatite. The toughness and modulus values of hydroxyapatite/polysulfone were within the range of cortical bone.     

玻璃微珠改性PP和LLDPE力学性能的比较研究

采用玻璃微珠(GB)改性聚丙烯(PP)和线性低密度聚乙烯(LLDPE)，对玻璃微珠的用量、粒径和复合材料加工方法对材料的力学性能的影响进行了比较研究。结果表明：随着GB用量的增加，单、双螺杆挤出GB／PP复合材料的拉伸模量、弯曲强度和弯曲模量均呈线性增长的趋势，而屈服强度则有小幅下降；断裂应变在低含量时有所提高，然后迅速下降；单双螺杆挤出材料的冲击强度均有所提高，并在一定范围内随GB用量的提高而增大，且单螺杆挤出材料的冲击强度略高于双螺杆挤出材料。而GB／LLDPE中，随着GB用量的增加，单螺杆挤出复合材料的拉伸模量、弯曲模量均呈线性增长趋势，而屈服强度和弯曲强度在含量较高时略有上升；双螺杆挤出复合材料的拉伸模量、屈服应力、弯曲强度和弯曲模量均呈线性增长的趋势，两者的断裂应变都有所降低，但没有严重劣化LLDPE复合材料的冲击特性。GB的粒径对两种复合材料的力学性能影响不大，但对GB／PP复合材料的韧性有较大影响。单、双螺杆挤出GB／PP复合材料的冲击强度在一定范围内较纯料有一定提高；同样的，双螺杆挤出复合材料的冲击强度低于单螺杆挤出材料。     

Processing of yttria stabilized zirconia reinforced with multi-walled carbon nanotubes with attractive mechanical properties

The improvement of the mechanical properties of carbon nanotube reinforced polycrystalline yttria-stabilized zirconia (CNT-YSZ) was questionable in earlier investigations due to several difficulties for processing of these composites. In the present article, the authors are proposing a successful technique for mixing pre-dispersed CNTs within YSZ particles followed by a fast spark plasma sintering at relatively low temperature, resulting in near full-dense structure with well-distributed CNTs. Composites with CNT quantities ranging within 0.5-5 wt% have been analyzed and a significant improvement in mechanical properties, i.e. Young's modulus, indentation hardness and fracture toughness with respect to monolithic YSZ could be observed. To support these interesting mechanical properties, high-resolution electron microscopy and Raman spectroscopy measurements have been carried out. The analysis of densification shows that the lower densification rate of CNT reinforced composites with respect to the pure YSZ could be attributed to a slower grain boundary sliding or migration during sintering.     

Morphology and properties of thermoplastic polyurethane nanocomposites incorporating hydrophilic layered silicates

Hydrophilic layered silicate/polyurethane nanocomposites were prepared via twin screw extrusion and solvent casting. Good dispersion and delamination was achieved regardless of processing route, illustrating that the need for optimised processing conditions diminishes when there is a strong driving force for intercalation between the polymer and organosilicate. Evidence for altered polyurethane microphase morphology in the nanocomposites was provided by DMTA and DSC. WAXD results suggested that the appearance of an additional high temperature melting endotherm in some melt-compounded nanocomposites was not due to the formation of a second crystal polymorph, but rather due to more well-ordered hard microdomains. Solvent casting was found to be the preferred processing route due to the avoidance of polyurethane and surfactant degradation associated with melt processing. While tensile strength and elongation were not improved on organosilicate addition, large increases in stiffness were observed. At a 7 wt% organosilicate loading, a 3.2-fold increase in Young's modulus was achieved by solvent casting. The nanocomposites also displayed higher hysteresis and permanent set.     

Influence of compatibilizer and processing conditions on the dispersion of nanoclay in a polypropylene matrix

Polypropylene/organoclay nanocomposites have been prepared via direct melt intercalation in an internal mixer. Maleic anhydride grafted polypropylene (PP-g-MA) was used as a compatibilizer to improve the dispersability of the clay. The structures of nanocomposites have been characterized by X-ray diffraction, transmission electron microscopy and rheometry in small amplitude oscillatory shear. The effects of concentration of PP-g-MA and processing parameters were investigated. Wide angle X-ray diffraction shows that the interlayer spacing increases with the concentration of PP-g-MA, but is not significantly influenced by processing conditions. The study of linear viscoelastic properties shows that the storage modulus G′ is very sensitive to the microstructure of the nanocomposite. A Carreau-Yasuda law with a yield stress is proposed to describe the rheological behavior of these materials. Applications to the twin screw extrusion process are also presented.     

In situ hot pressing/reaction synthesis,mechanical and thermal properties of Lu2SiO5

Lu₂SiO₅ is a promising candidate of environmental barrier coatings (EBC) for silicon based ceramics due to its excellent high temperature stability. However, little information is available for the mechanical and thermal properties of Lu₂SiO₅, which frustrated evaluation of its performances for EBC applications. In this paper, dense Lu₂SiO₅ ceramic is successfully fabricated from Lu₂O₃ and SiO₂ powders by in situ hot pressing/reaction sintering at 1500 °C. Mechanical properties, including Young's modulus, bulk modulus, shear modulus, Poisson's ratio, fracture toughness, Vickers hardness, and bending strength are reported for the first time. Lu₂SiO₅ possesses excellent high temperature mechanical properties up to at least 1300 °C. Thermal stress for the case of Lu₂SiO₅ or Y₂SiO₅ coating on silicon bond coat and thermal stress resistance parameter are also estimated based on the experimental mechanical and thermal properties. The present results suggest that Lu₂SiO₅ has better reliability than Y₂SiO₅ in harsh thermal environment.     

碳纤维的硝酸氧化及表面化学分析

采用 X光电子能谱 (XPS)及化学衍生法探讨了硝酸氧化前后的碳纤维表面化学的变化。研究表明 ,高模量碳纤维的表面化学基团含量要比低模量碳纤维的低。硝酸氧化对低模量碳纤维的表面改性远比高模量碳纤维的大。硝酸氧化减少了碳纤维表面的羟基含量 ,同时增加了碳纤维表面的羧基含量。     

低模量硅酮建筑密封胶的研究进展

简要介绍了低模量硅酮建筑密封胶的制备方法,综述了低模量硅酮建筑密封胶的种类、性能及应用。     

Multi-Response Optimization of Injection Moulding Processing Parameters Using the Taguchi Method

Determining the superlative optimal processing parameters on multi-responses is an intricate task. A new constitutive approach in solving multi-response problems using a combination of single responses through the Taguchi method is developed in this study. Mechanical properties improvement of the part made of recycled PP is highlighted to demonstrate the significance of the approach. From the results, the flexural modulus and strength of the part produced by the approach improved to 4.1% and 6.7%. Therefore, the solution from this approach can be used by engineers who are searching for a simple and straightforward optimal solution using the injection moulding process.