热塑性弹性体的研究进展

热塑性弹性体(TPE)兼具塑料和橡胶的特性,是近年来发展较快的一种新型高分子材料.文章介绍了苯乙烯类、聚氨酯类和聚烯烃类3类消耗量最大的热塑性弹性体,并对聚烯烃类热塑性弹性体中采用动态硫化技术制备的热塑性硫化橡胶的国内外研究进展进行了综述.     

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。     

热塑性聚氨酯弹性体技术与市场发展近况

热塑性弹性体（TPE）是一种介于橡胶和热塑性塑料特性的高分子材料，具有橡胶和塑料的双重性和宽广的应用特性。目前TPE消费结构中，主要品种是苯乙烯类（TPS）、烯烃类（TPO）和聚氨酯类（TPU）。2006年全球TPE消费量已达到220万t左右，我国已达到42万t左右，我国已成为全球TPE需求增长最快的国家之一。     

热塑性弹性体材料的研究进展与市场前景

本文综述了热塑性弹性体 (TPE)材料的发展 ,共混型TPE的动态硫化技术及制备TPE的技术条件 ,评述并展望了其发展态势与方向     

国外热塑性弹性体的进展

本文介绍了国外聚烯烃系（ＴＰＯ）、苯乙烯系（ＳＢＣ）、聚氨酯系（ＴＰＵ）、聚酯系（ＴＰＥＥ）、聚酰胺系（ＴＰＡＥ）和聚氯乙烯系（ＴＰＶＣ）等六大类热塑性弹性体（ＴＰＥ）的研究开发进展。     

热塑性弹性体注塑特性研究

热塑性弹性体由于具有橡胶的高弹性和树脂的良好加工性能从而越来越广泛的得到了应用,以手机天线模具为例,通过实验探索并揭示工艺条件对聚氨酯和聚烯烃共混物这两种热塑性弹性体注塑特性影响,为热塑性弹性体注射工艺的优化提供借鉴。     

动态硫化热塑性弹性体的研究进展

简介了动态硫化热塑性弹性体的发展历史,并按橡胶及树脂组分的极性对动态硫化热塑性弹性体进行了分类(非极性橡胶与非极性树脂、极性橡胶与非极性树脂、非极性橡胶与极性树脂、极性橡胶与极性树脂).综述了最近几年国内外有关动态硫化热塑性弹性体在制备与性能(包括新品种、配合体系、改性及研究手段)、流变性能、微观形态、动态力学性能方面...     

EPDM/PP热塑性弹性体研究进展

对动态硫化EPDM /PP热塑性弹性体的研究作了简要回顾 ,介绍了动态全硫化制备EPDM /PP热塑性弹性体的方法 ,重点讨论在动态硫化中影响EPDM /PP热塑性弹性体的力学性能、流变性能、相态结构和结晶性能的一些因素     

动态硫化EPDM/PP热塑性弹性体

本文详细讨论了三种硫化体系对动态硫化EPDM／PP热塑性弹性体力学性能及加工性能的影响，并介绍了动态硫化EPDM／PP硫化体系的新进展。     

动态交联热塑性弹性体增韧聚丙烯合金

用动态交联方法制备聚烯烃热塑性弹性体（ＴＰＯ）增韧聚丙烯，制备了具有低温冲击性能良好、综合力学性能比较均衡的聚丙烯合金。同时，研究了ＴＰＯ组成、工艺及基体组成与ＴＰＯ增韧聚丙烯共混物力学性能的关系。并通过差热扫描量热计和扫描电镜考察了共混物的形态结构。     

国内外聚苯硫醚产业的发展与前景

综述了国内外聚苯硫醚产业的发展,技术进步与市场,展示了其非常良好的发展前景。对我国聚苯硫醚产业今后的发展进行了讨论,提出了建议。     

中国石化非常规油气资源潜力及勘探进展

中国石油化工集团有限公司(简称中国石化)矿权区内拥有较为丰富的非常规油气资源,煤层气可勘探面积为10.19万km2,煤层埋深小于2 000 m的煤层气地质资源量为11.02万亿m3。页岩气可供勘探面积为17.5万km2,初步估算页岩气地质资源量为15.9万亿m3。页岩油勘探面积为11.76万km2,具有较大的资源基础及潜力。中国石化自2004年开始关注非常规油气资源,先后启动了页岩油气、煤层气等非常规油气资源的研究和勘探工作。目前在泌阳凹陷页岩油勘探泌页HF-1水平井分段压裂后获日产油23.6 m3;元坝地区多口陆相钻井测试获得高产气流,建南地区建页HF-1井日产气12 300 m3;延川南区块煤层气已探明地质储量为106.47亿m3,多口井排采获工业气流,初步形成了中国石化非常规油气资源多类型、多阶段的勘探开发格局。     

The effect of integrated product development on efficiency and innovation

This study tested the effect of integrated product development (IPD) on the efficiency and innovation displayed in new product development (NPD) projects. IPD refers to the overlap, parallel execution, and concurrent workflow of activities. More than 600 employees from 62 R&D projects in one large hi-tech electronics organisation participated in the study. The degree to which the projects had actual IPD, innovated and worked efficiently were measured using the organisation's data collection system and questionnaires. Analysis was conducted at the project level. Seven regression models, as well as multiple comparison tests, were applied. The findings suggest that IPD is positively associated with efficiency and negatively with innovation. However, the trade-off between efficiency and innovation in NPD projects can be balanced, if the IPD level of implementation is tailored to the NPD project stages. Specifically, to successfully complete an NPD project, the emphasis in early stages must be on innovation so that it can assist teams seeking new ideas. Hence, management should implement a low level of IPD at this point. In later stages efficiency must be emphasised so it assists control, and co-ordination, and consequently, IPD should be implemented intensively.     

The progress of radioisotope technology and application in China

The inception of radioisotope and its application in China are introduced. The research,development, production, application progress and the future development prospect of radioisotope and its products are described.     

改性聚偏氟乙烯接枝苯乙烯磺酸质子导电膜的结构与形貌

以过氧化苯甲酰(BPO)作引发剂,通过溶液接枝聚合法把苯乙烯接枝到原硅酸钠改性的聚偏氟乙烯(PVDF)膜上,磺化后得到聚偏氟乙烯接枝苯乙烯磺酸(PVDF-g-PSSA)电解质膜。研究发现,原硅酸钠改性的PVDF膜与苯乙烯发生接枝聚合反应,且接枝率与添加原硅酸钠的质量分数呈线性变化关系。用红外光谱检测原硅酸钠改性的PVDF膜经过接枝和磺化后所发生的结构变化,并用扫描电镜(SEM)观察PVDF膜接枝前后的形貌以及接枝磺化后产物PVDF-g-PSSA膜的形貌及硫和硅分布。研究表明,原硅酸钠改性的PVDF膜与苯乙烯进行接枝共聚反应时,PVDF膜结构在接枝前后和磺化前后发生变化,确认苯乙烯接枝到PVDF膜上。     

PPENK增韧改性BMI树脂体系的制备与性能

采用溶液法制备了杂萘联苯聚芳醚腈酮(PPENK)/双马来酰亚胺树脂(BMI)共混体系。通过差示扫描量热法(DSC)对共混体系固化反应动力学进行了研究,固化活化能为85.8 kJ/m2。采用冲击和拉伸实验考察了PPENK含量对共混体系力学性能的影响,共混体系的冲击强度为1.83 kJ/m2～2.95 kJ/m2,拉伸强度为68 MPa～84 MPa,拉伸模量为1.14 GPa～1.53 GPa。通过对固化物断面的扫描电镜(SEM)分析了增韧机理,改性后的BMI树脂在断裂时发生了塑性变形。通过热重分析法(TGA)研究了体系的耐热性,共混体系在氮气气氛中5%热失重温度为420℃～426℃。     

Taxonomy of information technology strategy and its impact on the performance of third-party logistics (3PL) in China

This paper develops a taxonomy of information technology strategies used by third-party logistics (3PL) firms in China based on a cluster analysis of survey data from 105 of these 3PL firms. The information technology strategies have been classified into three major groups: supportive, technological, and aligned. The paper also investigates the effect of information technology strategies on information technology advantage, competitive advantage, and financial performance. The results of the study indicate that efforts to improve information technology systems can only be effective if the information technology improvements are properly aligned with a company's overall strategy. It is found that companies that attempt to improve their information technology systems without the proper alignment of information technology with the company's overall strategy can achieve information technology advantages relative to their competitors, but not competitive advantages or improved financial performance. This study is the first attempt to develop an information technology strategy taxonomy for 3PL companies in China. It provides valuable guidance and insights for managers in the development of information technology strategies in 3PL companies.     

基于作业成本法下SMT生产线成本的分析及应用

在对作业成本法原理分析的基础上,研究了计算机中使用的集成电路板SMT生产线的成本分配,提出了基于成本动因来划分SMT生产线成本的方法.这种方法为生产管理者提供了比较准确的成本信息,从而为有效控制产品成本,提高产品竞争能力打下基础.     

The interrelation of changes in oxygen content and product quality in modified atmosphere packages of peanuts

The aim of this work was to examine the effect of changes in oxygen content in different types of packages for snacks (multilayer laminated materials, cans) and analyse the changes in the sensorial and physicochemical characteristics of the stored products. Roasted and salted peanuts produced by one of the well‐known companies, packed in modified atmosphere packages (MAP) were the object of this investigation. The interdependence of the changes in oxygen content and product quality was examined in relation to the storage period and type of package used. From the results it can be said that changes in oxygen content in packages of peanuts produce similar effects irrespective of the packaging material used. The correlation observed during storage of peanuts, between changes in oxygen content in different packaging materials and changes of the separate sensorial and physicochemical parameters of the product, especially of the peroxide value, may be a basis for validity forecasting and determination of the optimum composition of gas mixture. This study indicates that evaluation of the quality of packages integrally related to their content should consider both product examination and the package and gas mixture composition, as there may exist an interdependence between quality features of the product and oxygen content in a package. Copyright © 2001 John Wiley & Sons, Ltd.     

The oxidation kinetics of magnesium at low temperatures and low oxygen partial pressures

The initial oxidation of magnesium at oxygen partial pressures between 1.3 × 10^− 8 Pa and 1.3 × 10^− 5 Pa and at temperatures just above room temperature has been investigated in situ with X-ray photoelectron spectroscopy (XPS) and ellipsometry. Quantitative analysis of the XPS spectra showed that the initially formed oxide has a higher Mg/O ratio (> 1.3) than bulk MgO. Ellipsometry measurements indicated that the band gap values of the oxide layers are considerably smaller than the value expected for bulk MgO ( 2.5 eV vs. 7.8 eV). From the XPS and ellipsometry data recorded as a function of oxidation time the oxidation kinetics have been determined. The kinetics has been described quantitatively with a coupled currents model, involving simultaneous transport of electrons and ions through the oxide layer.