Synergistic effect of polyfunctional silane coupling agent and styrene acrylonitrile copolymer on the water‐resistant and mechanical performances of glass fiber–reinforced polyamide 6

Adverse effects of a high‐water absorption rate on properties of a glass fiber–reinforced polyamide 6 (GF‐PA6) composite significantly reduce performance and limit application in humid environments. In this paper, a polyfunctional silane (PFS) coupling agent with amino (–NH₂) and imino (–NH) groups and styrene acrylonitrile copolymer (SAN) were added to a composite, GF‐PA6, to prepare GF‐PA6/SAN/PFS composites via melt blending in a twin‐screw extruder. The effects of SAN and PFS content on the static and dynamic mechanical properties of the composites before and after water absorption were investigated in detail. The microstructure of the fracture surface was analyzed by a scanning electron microscope (SEM). The results show that the addition of SAN and PFS could effectively inhibit water absorption of the GF‐PA6 composites. The alkoxyl groups on PFS reacted chemically with the nitrile groups of SAN, which enriched SAN on the interface between the fiber and matrix during the extrusion and mixing process to improve the effect of water prevention. Therefore, the mechanical properties of the wet state were notably improved while preventing water from permeating the interface by only the addition of a small amount of SAN and PFS. Dynamic mechanical analysis (DMA) results showed that the addition of PFS improved the compatibility of PA6 with SAN and enhanced the interface adhesion between fiber and PA6. In terms of test result of the comprehensive performance, 10 phr SAN with 0.6 phr PFS was the best dosage.     

浅析制播系统存储结构

存储系统网络平台已经成为广播电视制播系统的一个核心平台,对其要求不但包括存储容量,还包括数据访问和数据传输性能,数据管理与存储扩展能力等。存储网络平台的性能高低,关系到整个系统的正常运行。本文主要探讨存储结构及其相关。     

新升本院校图书馆存储系统方案探讨

针对新升本院校图书馆的数据存储类型、数据访问量及需求特点,介绍了目前常用的几种图书馆存储系统方案,并对其存储性能进行了比较分析,指出基于IPSAN的存储系统是适合新升本院校图书馆的存储解决方案。     

Design and Implementation of SCSI Target Emulator

Introduction With the explosion in the amount of information, the performance and scalability of storage systems have become critical issues along with the system cost-effectiveness. Storage area network (SAN)[1] is a new storage system model with excelle…     

基于WBEM存储网络管理中资源注册机制的实现

存储网络是由各种存储设备和网络设备组成的面向数据存储的专用网络系统.存储网络中的设备具有很大的动态性,因此,如何获得网络中设备的状态和性能是实现存储网络管理中的一个最基本要求.论文基于WBEM管理框架,引入受管资源注册以及SIP中的注册机制,提出并实现一种存储网络设备的自动发现方法.测试结果表明,论文所提出的设备自动发现算法具有较好的性能和应用价值.     

Modeling of thermodynamic behavior of PVT properties and cloud point temperatures of polymer blends and polymer blend + carbon dioxide systems using non-cubic equations of state

In recent years, many factors influencing phase behavior of polymer blends have been studied because of their widely technological importance, as a simple method of formulating new materials with tailored properties which make them suitable for a variety of applications. This work has three main goals which were reached by using the Perturbed Chain Statistical Associating Fluid Theory (PC-SAFT) and the Sanchez–Lacombe (SL) non-cubic equations of state (EoS), which in previous works have shown their ability to handle long chain and associating interactions. First, both equations of state were tested with the correlation of the specific volumes of pure blends (PBD/PS, PPO/PS, PVME/PS, PEO/PES) and the prediction of the specific volumes for blends; second, the modeling of blend miscibilities in the liquid–liquid equilibria (LLE) of PBD/PS, PPG/PEGE, PVME/PS, PEO/PES, and PnPMA/PS blends; third, the modeling of the phase behavior of PS/PVME blends at various compositions in the presence of CO₂. PC-SAFT and SL pure-component parameters were regressed by fitting pure-component data of real substances (liquid pressure–volume–temperature, PVT, data for polymers and vapor pressure and saturated liquid molar volume for CO₂) and the fluid phase behavior of blend systems were simulated fitting one binary interaction parameter (k_ij) by regression of experimental data using the modified likelihood maximum method. Results were compared with experimental data obtained from literature and an excellent agreement was obtained with both EoS, which were also capable of predicting the fluid phase behavior corresponding to the critical solution temperatures (LCST: lower critical solution temperature, UCST: upper critical solution temperature) of blends.     

Morphology and Physical Properties of ABS/NBR: The Effect of Melt Viscosity of SAN and the Content of NBR

In several acrylonitrile-butadiene-styrene (ABS) copolymers, some amounts of polybutadiene (PB) laTeX grafted with styrene-acrylonitrile (SAN) copolymer were replaced by acrylonitrile-butadiene rubber (NBR) copolymer, and the variations of morphology, mechanical properties, and rheological properties were examined. The impact strength of ABS, with a bimodal distribution of rubber size, was improved by the presence of the NBR, which distributes coarsely in the SAN matrix. Yield behavior in the rheological response due to the presence of rubber particles in the SAN matrix was enhanced by the coarser NBR particles, especially at high temperature.     

SAN的拓扑结构及实现方案

SAN(Storage Area Network)是一种新型的网络存储技术,它以光纤通道为传输媒体,通过集中式存储管理机制较好地解决了大容量信息的传送和存储问题,具有比传统网络存储模式更好的可用性、可伸缩性和可扩展性.讨论了SAN的硬件组成、拓扑结构,以及实现SAN的几种设计方案.     

基于SAN的高校图书馆存储中心的设计与实现

数字图书馆存储中心是各类数据库和应用服务器集中的地方,存储密度大,有大量数据交换,如何构建高效率的数据中心以便对外提供优质访问,就成了数字图书馆建设的关键。该文采用SAN技术,设计架构图书馆高效数据中心,并对相关技术进行讨论。     

服务器虚拟化技术的应用

随着信息化建设步伐的加快,数据大量集中将成为数据持续性的重要保障之一。目前,分散于数据机房中的服务器数量不断增加,数据大量集中,致使难以获知服务器的负荷情况,从而无法调整负荷,造成服务器资源利用不充分等问题。从服务器虚拟化的角度探讨服务器CPU、内存、SAN存储等资源如何根据应用负荷进行动态分配。