低密度泡沫玻璃的研究与应用

低密度泡沫玻璃是利用碎玻璃制造的一种气孔率大于90%的隔热保温材料,它具有强度高、导热系数小、吸水率低、不吸湿、耐腐蚀等特性,在潮湿环境下抗冻性能好,是一种优良的低温、超低温隔热保温材料。该产品用途广泛,所用的原材料简单易得,但生产工艺过程比较复杂,生产过程控制精度要求较高,容易产生各种缺陷而影响产品的质量。本文对低密度泡沫玻璃的生产工艺过程进行详细的分析研究,提出相应的措施,确保产品的低密度和高成品率,提高产品的性能,扩大产品的使用范围。     

超临界流体技术在微孔发泡聚合物制备中的应用

介绍了超临界流体技术和微孔聚合物的概念及优点。着重介绍了超临界流体技术在微孔聚合物制备中的应用及发展状况，并简单介绍了制备微孔聚合物的影响因素，最后阐述了对超临界流体技术的展望和建议。     

Flow pattern measurement in a full scale silo containing iron ore

The flow pattern in a silo is important because it affects both the recovery of solids and the pressures on the silo wall during discharge. Wherever mass flow is not achieved, the boundary of the flow channel has significant implications for both the functional and structural design of the silo. Many techniques have been used for the study of flow patterns in model silos, but most cannot be used at full scale, and very few quality measurements at full scale have ever been made. This paper outlines a full scale experimental study in which the patterns of solids flow and the flow channel boundaries are reliably quantified.The full scale silo was specially designed, constructed and instrumented to exhibit funnel flow and to make observations of the solids flow pattern and the silo wall pressures. It had three outlets: one concentric, one fully eccentric and one in between. Three materials were used: iron ore pellets, slag fines and crushed basalt. This paper describes experiments involving iron ore pellets. The silo was seeded with radio frequency tags whose residence times were measured by detecting them on exit during discharge. The residence time data were studied to deduce the discharge flow pattern. This paper presents the results of three different flow pattern interpretation techniques: the best of them (mass-time relationships) is shown to give a very clear identification of the solids flow pattern and the flow channel boundary.     

DSC study of transitions involved in thermal treatment of foamable mixtures of PE and EVA copolymer with azodicarbonamide

The transitions and reactions involved in the thermal processing of binary mixtures of polyethylene and poly(ethylene‐co‐vinyl acetate) copolymers with different concentrations of a foaming agent (azodicarbonamide) were studied using differential scanning calorimetry (DSC). The effect of ZnO as a kicker also was discussed. The temperature at the maximum rate and the heat evolved were measured for all the processes—melting, transitions, and reactions—all the mixtures prepared were measured and compared. Azodicarbonamide decomposed differently depending on the polymeric matrix. These data can be very useful for the plastic processing industry. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2015–2025, 2006     

Nickel foam and carbon felt applications for sodium polysulfide/bromine redox flow battery electrodes

The first use of nickel foam (NF) as electrocatalytic negative electrode in a polysulfide/bromine battery (PSB) is described. The performance of a PSB employing NF and polyacrylonitrile (PAN)-based carbon felt (CF) as negative and positive electrode materials, respectively, was evaluated by constant current charge-discharge tests in a single cell. Charge/discharge curves of the cell, positive and negative electrodes show that the rapid fall in cell voltage is due to the drop of positive potential caused by depletion of Br₂ dissolved in the catholyte at the end of discharge. Cell voltage efficiency was limited by the relatively high internal ohmic resistance drop (iR drop). Polarization curves indicated that both NF and CF have excellent catalytic activity for the positive and negative redox reactions of PSB. The average energy efficiency of the single cell designed in this work could be as high as 77.2% at 40 mA cm⁻² during 48 charge-discharge cycles.     

天然茶皂素的提取及泡沫性能

茶皂素是一种天然的表面活性剂 ,通过几种浸取剂的研究 ,表明 60 %甲醇溶液为最好浸取剂。浸取温度 40℃～ 50℃ ,浸取时间 4 5h左右。浸取的茶皂素与多种表面活性剂比较 ,说明它是一种发泡性好、泡沫稳定性优良的发泡剂     

可发泡性酚醛树脂的合成研究

考查了可发泡性酚醛树脂的合成条件,如反应时间、温度和催化剂用量等对树脂活性、物理以及酚醛泡沫塑料容重和表观品质的影响,结果表明:催化剂用量越大,树脂粘度越大,泡沫固化时间越长;反应时间介于65～95min,泡沫塑料容重和表观品质较好;用加热板测定了合成的可发泡性树脂的固化速度,并求出固化反应活化能。     

混杂增强聚氨酯复合硬质泡沫塑料的研制

系统介绍混杂增强聚氨酯复合硬质泡沫塑料的制备情况，详细分析聚氨酯硬质泡沫塑料制备过程中的工艺问题，表征与分析其结构与性能，着重分析偶联剂对填充物增强性能的影响以及填充物含量对聚氨酯硬质泡沫塑料吸水性能的影响，介绍聚氨酯硬质泡沫塑料的应用，最后指出其发展前景。     

聚氨酯软泡压陷性能的测试

介绍了软质聚氨酯泡沫塑料压陷性能的测试标准，不同厚度样品的压陷硬度测试值的差异，采用50%压缩负荷估计压陷硬度的简易测试方法，以及压陷性能测试的影响因素，并对测试聚氨酯软泡压陷性能的国家标准与国外标准的差别进行了比较。     

泡沫微晶玻璃的研究进展

概述了泡沫微晶玻璃的性能及应用,综述了泡沫微晶玻璃的研究进展,并对泡沫微晶玻璃的发展方向进行了展望。