聚丙撑碳酸酯/三元乙丙橡胶共混改性弹性体的研究

将聚丙撑碳酸酯（ＰＰＣ）与三元乙丙橡胶（ＥＰＴ）共混制成弹性体,研究了ＰＰＣ的添加量,硫化时间,硫化温度和添加炭黑对共混弹性体的物理力学性能,交联度的影响,研究发现,ＰＰＣ能与ＥＰＴ形成化学交联,加入一定量的ＰＰＣ能使ＥＰＴ弹性体的拉伸强度,断裂伸长率提高。     

聚甲醛／聚四氟乙烯共混物的摩擦学性能研究

采用冷压－热烧结工艺研制了一系列不同含量ＰＴＦＥ的ＰＯＭ／ＰＴＦＥ共混物，在往复摩擦磨损试验机上评价了共混物的摩擦磨损性能，并利用ＳＥＭ、ＸＰＳ和ＡＥＳ对其磨损机理进行了研究。结果表明，在共混物中ＰＴＦＥ的成分增加，不仅可以降低ＰＯＭ／ＰＴＦＥ共混物的摩擦系数，还可以增强ＰＯＭ的耐磨性，主要原因是共混物中ＰＯＭ和ＰＴＦＥ皆向对偶转移，形成了富集ＰＴＦＥ的转移膜。同时发现填加１０％～２０％ＰＴＴＥ的共混物具有较好的摩擦磨损性能。     

PP—EPR—PP增容PP／EPT的研究

采用δ－ＴｉＣｌ３－Ｅｔ２ＡｌＣｌ催化合成了三元乙丙嵌段共聚物ＰＰ－ＥＴＲ－ＰＰ，作为乙丙橡胶（ＥＰＴ）增韧聚丙烯（ＰＰ）的增容剂，以改善ＰＰ的低温冲击性能。实验发现，ＰＰ－ＥＰＲ－ＰＰ中ＥＰＲ段较长，有利于提高基增容效果，ＰＰ－ＥＰＲ－ＲＲ的加入量仅为４％，就可以显著的改善ＰＰ和ＥＰＴ相容性，使ＰＰ／ＥＰＴ／ＰＰ－ＥＰＲ－ＰＰ共混物的无缺口强度比相应的ＰＰ／ＥＰＴ在－２０℃时提高４０％，在－４０     

国外文摘

电镀９８０９００１镀铬用ＰＴＦＥ改性石墨阳极——ＭａｎｔｃｈｅｖａＲ．Ｍｅｔａｌｏｂｅｒｆｌａ¨ｃｈｅ，１９９６，５０（１２）∶９６７（德文）ＰＴＦＥ改性石墨阳极比普通石墨阳极耐腐蚀及耐化学药品侵蚀能力更强，分析了使用不同ＰＴＦＥ含量（最高达７０％）...     

对几种不同熔融指数HDPE的PTC性能及其改性研究

研究了４种不同熔融指数的ＨＤＰＥ的正温度效应（ＰＴＣ）效应，发现它们经辐射交联后具有相似的ＰＴＣ行为，对此进行了解释，并进一步研究了交联以及填加少量ＥＰＤＭ对改善ＨＤＰＥ的ＰＴＣ性能的影响。     

新型耐候性涂料用含氟树脂“ザフロン”

新型耐候性涂料用含氟树脂“ザフロン”一、引言自从１９３４年Ｓｃｈｌｏｆｆｅｒ和Ｓｃｈｅｒｅｒ发现了ＰＣＴＦＥ（聚三氟氯乙烯），１９３８年Ｐｌｕｎｋｅｔｔ发现了ＰＴＦＥ（聚四氟乙烯）以来，许多科学家对含氟树脂进行了研究。工业上也以ＰＴＦＥ和ＰＣＴＦＥ为...     

固相法CPE增容PVC／LDPE共混体系的研究

通过力学性能试验、动态力学分析（ＤＭＡ）、电子显微镜观察，研究了固相法氯化聚乙烯（ＣＰＥ）对聚氯乙烯（ＰＶＣ）与低密度聚乙烯（ＬＤＰＥ）共混体系的增容作用。实验结果表明，ＣＰＥ的加入能明显改善ＰＶＣ／ＬＤＰＥ共混体系的相容性，显著提高共混物的力学性能，且低温氯化制得的ＣＰＥ的改善效果优于两段氯化制得的ＣＰＥ。电子显微镜观察表明，增容剂增加了共混体系相间相互作用或相界面粘附性，对共混体系的形态结构产     

PVC／LLDPE共混体系形态结构的控制

采用氢化聚丁二烯－ｂ－甲基丙烯酸甲酯（ＰＢＤ－ｂ－ＰＭＭＡ）共聚物作为聚氯乙烯／线性低密度聚乙烯（ＰＶＣ／ＬＬＤＰＥ）共混体系的增容剂，用扫描电子微镜（ＳＥＭ）和透射电子显微镜（ＴＥＭ）对共混体系的冲击缺口断面和相结构进行了研究。并用小角激光菜射技术了ＬＬＤＰＥ在共混物中的结晶行为，发现增容剂对共混体系的形态结构会产生极大的影响。     

圣几种不同熔融指数HDPE的PTC性能及其改性研究

研究了４种不同熔融指数的ＨＤＰＥ的正温度效应（ＰＴＣ）效应，发现它们经辐射交联后具有相似的ＰＴＣ行为，对此进行了解释，并进一步研究了交联以及填加少量ＥＰＤＭ对改善ＨＤＰＥ的ＰＴＣ性能的影响。     

离子辐射法回收利用废PTFE

离子辐射法回收利用废ＰＴＦＥ１．废ＰＴＦＥ的回收利用问题废聚四氟乙烯（ＰＴＦＥ）的回收利用是ＰＴＦＥ生产和加工中必须认真加以解决的重要问题，这是因为：①在每次聚合过程开始和结束之时总要产生一定数量的不合格品，然后才会达到最佳生产状态，在每批聚合产品中...     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.