在高温下能长期使用的高性能热塑性弹性体(TPVs)

通过改性氢化苯乙烯嵌段共聚物TPV与传统的TPVs（PP／EPDM）比较,发现前者拉伸强度提高了10％。20％,耐热油性能也得到提高。该TPV具有良好的回弹性能和压缩永久变形性能。苯乙烯型TPV能够注射成型和循环使用。     

NBR/三元尼龙/二元尼龙三元共混型热塑性弹性体制备工艺与性能的研究

在开炼机上用动态硫化法制备了NBR／三元尼龙／二元尼龙三元共混型热塑性弹性体。研究了共混工艺、返炼次数、动态硫化温度、二元尼龙用量等因素对材料性能的影响。NBR／三元尼龙／二元尼龙三元共混型热塑性弹性体不仅具有优异的耐溶剂性，而且其物理性能也较好。     

Investigation of thermoplastic elastomer (TPE) foaming process using blowing agent by rheological and morphological methods

The effects of a chemical blowing agent (CBA) or an encapsulated physical blowing agent (PBA) on morphological development in ethylene octene copolymer (EOC) matrix using dicumyl peroxide (DCP) as a curing agent were investigated by rheological, mechanical, and morphological methods. Temperature ramp tests were carried out to understand curing and foaming processes. Curing temperature (T_cure) was determined as the crossover temperature where storage modulus G′ coincided with loss modulus G′′ in the rheological point of view. For the CBA, T_cure increased with increasing CBA concentration, whereas for the PBA, T_cure decreased with increasing PBA concentration. Other critical temperatures T_1st, T_2nd by foaming process were determined using the axial normal force. With these critical temperatures (T_cure, T_1st, T_2nd), curing and foaming mechanisms can be estimated. Simultaneously, volume expansions of samples were observed with camera. Morphology and mechanical analysis were conducted on fully cured and foamed ECP (is defined as EOC with DCP) with blowing agent. ECP with the CBA exhibited an irregular open-cell structure, whereas when produced using the PBA, it formed a regular closed-cell structure. Specific tensile strength tended to increase with increasing PBA concentration but as blowing agent concentration increased elongation at break decreased. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47358.     

热塑性弹性体的研究与产业化进展

化学合成型和共混型热塑性弹性体类型、市场概况、产业化进展及最新研究发展方向进行了论述。介绍了几种具有市场应用前景的新型热塑性弹性体品种,如聚酰胺类TPE、热可逆共价交联类TPE、茂金属催化聚烯烃类TPE、甲壳型液晶类TPE、生物基TPE、新型热塑性硫化橡胶等,对它们的制备方法、性能特点及市场发展概况进行了详细论述,并对它们的应用领域和产业化方向进行了评述和展望。     

引发剂正丁基锂品质改进及其在SBS生产中的应用

介绍了引发剂正丁基锂质量改进及其在热塑性弹性体SBS工业生产应用的情况。结果表明,通过生产设备与工艺的改进,正丁基锂质量指标如总锂含量、活性、氯丁烷含量、外观色泽和共价氯含量都达到美国FMC公司同类产品的标准,分别为总理质量分数(20.25±0.2)%、活性≥97.0%、外观为无色或微黄色无悬浮物透明溶液和w(共价氯)≤0.1%。工业应用试验结果表明,改进的引发剂正丁基锂产品质量与美国FMC公司的相当,完全能够取代进口产品应用于热塑性弹性体SBS的工业生产中。     

Performance of large fan-filter units for cleanroom applications

Fan-filter units (FFUs) are widely used in clean space to re-circulate and remove particles out of the airflows directed to cleanrooms or minienvironments. Energy and aerodynamic performance of FFUs may largely influence both energy efficiency and effectiveness in contamination control in the cleanroom design, qualifications, and operation. This article presents laboratory-measured performance of seven relatively new and large FFUs, with a section size of 122-cm×122-cm, or 4-ft×4-ft. In addition, this article includes a comparison of the performance of these large FFUs with that of smaller, 122-cm×61-cm (or 4-ft×2-ft) FFUs that were previously tested. The comparison was based upon a set of performance metrics such as total pressure efficiency (TPE) and energy performance index (EPI). This article found that there were wide variations in the energy performance of FFUs, and that using a consistent evaluation method can generate comparable FFU performance information. When operating at the maximal setting of speed control dials used to control their respective fan-wheel speeds, the larger units in this study tended to be more energy efficient than their smaller counterparts. The energy efficiency level of the same unit may vary considerably, depending on actual operating conditions such as airflow speeds and pressure rise across the units. Furthermore, this article provides recommendations for further investigations to improve energy efficiency of FFU applications.     

热塑性弹性体的研究进展

本文回顾了热塑性弹性体的发展史,介绍了其技术现状及市场开发情况,重点评述了热塑性弹性体的研究进展,通过对其产品的概述,分析了其发展方向。     

热塑性聚烯烃弹性体在国内的发展及需求研究

通过对几种热塑性聚烯烃弹性体生产工艺的比较，以及对国内同类产品的生产和市场需求情况的分析，认为动态全硫化法生产的热塑性聚烯烃弹性体是需求增长最快的新型橡胶产品之一，具有较大的利润空间。     

基于JavaCard的移动代理系统安全性研究

With wide and increasing range applications of mobile agent technology, the security problem has gotten more and more focus. This paper discusses the security problems that the mobile agent system faces with at presentand the existing protesting schemes for it. Then a solving method based on JavaCard is proposed to protect mobile a-gents. And a feasible solving method is also provided to solve the security problems of JavaCard itself.