相选择性超分子凝油剂的研究现状

针对近年来出现的较严重的海上溢油污染事故,分析了海上石油污染的原因及其治理措施,介绍了凝油剂的应用现状。对处理水中溢油较有前景的凝油剂,尤其是相选择性超分子凝油剂的研究现状进行了综述;主要介绍了糖类衍生型、氨基酸衍生型、胆甾衍生型和有机酸及其盐衍生型相选择性超分子凝油剂,指出了它们在制备新型低价、高效、环保、可重复利用凝油剂方面的巨大潜力。开发使用简单、室温下能快速胶凝溢油、形成凝油块强度高的相选择性超分子凝油剂,或将凝油剂和吸油剂相结合是将来的发展方向。     

周期载荷下聚酯/橡胶复合材料和人造丝/橡胶复合材料的热生成对疲劳行为的影响

以单向帘线增强橡胶复合材料为研究对象,研究了周期载荷作用下橡胶复合材料的热生成对疲劳行为的影响。橡胶复合材料在疲劳过程中伴随较多的热生成,SEM观察表明:热生成温度与断裂表面密切联系。橡胶复合材料的滞后损失并不是全部转换为热,而是其中一部分被内能变化所消耗,不转换为有效热生成的滞后损失与疲劳损伤导致的结构变化有关。在疲劳试验中,直到疲劳破坏所消耗的平均有效能耗与疲劳寿命之间存在定量关系。     

天然橡胶/顺丁橡胶共混物疲劳历程的研究

采用扫描电子显微镜、电性能测定和热重法等分析手段，研究了炭黑补强的天然橡胶／顺丁橡胶共混硫化胶的疲劳历程，探索了其内在的疲劳损伤机理。     

周期载荷下聚酯纤维/橡胶复合材料和人造丝/橡胶复合材料的疲劳行为

利用自行建立的疲劳试验系统,以单向聚酯／橡胶复合材料和人造丝／橡胶复合材料为研究对象,揭示了在周期载荷作用下橡胶复合材料的疲劳损伤累积特性,给出了疲劳寿命预报方程,研究了频率对像复合材料疲劳寿命的影响以及材料表面温度的变化规律。发现：橡胶复合材料疲劳过程中伴有较高的热生成,这是橡胶复合材料与其他脆性复合材料最大的不同。疲劳过程中,聚酯/橡胶复合材料的表面温度可达100℃,人造丝／橡胶复合材料的表面温度可达40℃。频率对不同橡胶复合材料的疲劳寿命具有不同的影响。对滞后损失较大的聚酯／橡胶复合材料,增加频率其疲劳寿命明显降低;而对于滞后损失较小的人造丝／像胶复合材料,频率对其疲劳寿命的影响不明显。     

橡胶复合材料断裂力学疲劳研究进展

综述了断裂力学方法在橡胶复合材料中的应用现状,着重介绍了撕裂能理论在预测疲劳裂纹增长速率以及预报疲劳寿命方面的应用。     

Decomposition behavior and decomposition products of epoxy resin cured with MeHHPA in near-critical water

A kind of chemical method that used water as the liquid reaction medium to decompose epoxy resin was studied. The thermosetting epoxy resin was decomposed successfully under the condition of near-critical water. The decomposition rate of epoxy resin raised rapidly as the reaction time and reaction temperature increased. The decomposition reaction products were characterized by infra-red spectra and gas chromatography-mass spectrometry. The phenol, isopropylphenol, 4, 4′-(1-methylethylidene) bis-phenol were found as the main compounds in liquid products, which were common monomers from epoxy resin. When reaction was carried out at the temperature of 260 °C–300 °C, the decomposition mechanism of epoxy resin was envisaged as the ether and ester bonds cracking.     

单向聚酯帘线/橡胶复合材料的疲劳损伤机理

利用较Ｘ射线技术和扫描电子显微镜技术,研究了在周期载荷下单向聚酯帘线／橡胶复合材料的疲劳机理。结果表明,在高应务下,单向聚酯帘线／橡胶复合材料的疲劳损伤以聚酯帘线断裂为主,在中应力下,单向聚酯帘线／橡胶复合材料的疲劳损伤是逐步进行的;在你力下,单向聚酯帘线／橡胶复合材料的疲劳损伤仅有局部的界面损伤。     

Effect of Accelerated Xenon Lamp Aging on the Mechanical Properties and Structure of Thermoplastic Polyurethane for Stratospheric Airship Envelope

This study aimed to investigate the effect of artificial weathering test on the photoaging behavior of TPU films. Changes in mechanical properties, morphology and chemical structures are studied by tensile test, scanning electron microscopy, atomic force microscopy, Fourier-transformed infrared, and X-ray photoelectron spectroscopy. The results show that the photoaging negatively affects the initial modulus and stress at break values of TPU films. The surface of the specimen that is exposed to irradiation becomes rough, and some visible micro-defects such as blisters and voids can be detected. The morphology of the fracture surfaces illustrates that irradiation reduces the plasticity but increases the brittleness of the TPU films. The chemical structure analyses of the accelerated aged films prove that chemical structural changes in TPU films occur. The irradiation may break the long molecular chains on the surface of the specimens and form the lowmolecular weight oxygen-containing groups. The number of chain scissions increases with the increase in exposure time.     

跨省集团客户业务的实现方法研究

随着智能网VPMN业务的飞速发展,为迎合移动客户多样化的求,通了跨省虚拟集团客户业务(即跨省V网业务),使得订购跨省集团客户的用户在同跨省集团内(即全国范围同虚拟集团网内),无论省内漫游或是省际漫游,均可以通过拨打真实号码方式或是使用原来的省内VPMN业务的短号码方式进行通话,并且可以享受到更加优惠的资费。跨省集团客户业务的发展连同综合V网同实现了VPMN业务的大融合。文章针对实现跨省集团客户业务的具体关键点以及业务优化关键点进行了阐述。     

单向帘线增强橡胶复合材料在周期载荷下的动态粘弹性

研究了橡胶复合材料的疲劳行为，发现：橡胶复合材料在疲劳过程中具有明显的非线性粘弹性，材料的动态粘弹性在疲劳初期和末期表现出不同的趋势，与其他脆性复合材料不同，橡胶复合材料在疲劳过程中伴有较高的热生成，橡胶复合材料的滞后损失愈大，实际热生成温度愈高，其疲劳寿命降低愈明显。