光伏玻璃窑炉池壁砖侵蚀与热态维修

玻璃窑炉池壁砖的侵蚀程度,直接影响到玻璃窑炉的寿命。论述了玻璃窑炉池壁砖的侵蚀机理与原因、池壁侵蚀的缓解和池壁砖在热态状态下的维修。     

利用池壁水包保护池壁砖减少侵蚀方案

针对池壁砖玻璃液、配合料侵蚀问题,通过在池壁内侧插水包使得在受侵蚀池壁砖部位形成一层凉玻璃不动层,能够起到很好保护池壁砖免受侵蚀的作用,而且有利于减少锆质夹杂.     

谈如何在烤窑中减少池壁砖的炸裂

浮法熔窑池壁砖的寿命是决定熔窑寿命的重要因素之一。但池壁用电熔AZS砖在烤窑时又极易产生裂纹,严重影响熔窑使用寿命及玻璃质量,特别是近年来池壁刀把砖的使用,导致池壁砖炸裂的现象更加普遍,炸裂程度更加严重,本文结合我公司烤窑的实际情况,浅析如何避免池壁砖炸裂的问题。     

采用池壁挡料器及衬砖缓解侵蚀方案

玻璃熔窑在窑龄后期,熔化池壁砖上部因长期受到料堆、玻璃液侵蚀变薄或炸裂,通过在池壁砖上部内侧架设挡料器及衬砖,能有效地保护池壁,延长窑龄.     

玻璃窑炉池壁侵蚀的控制和热修

玻璃窑炉池壁是窑炉的重要组成部分,影响窑炉寿命,本文主要论述池壁砖的侵蚀机理、池壁侵蚀的控制和池壁砖的热修。     

玻璃熔窑池壁砖内贴水包冷却的开发研究

研究了玻璃熔窑上层池壁砖砖内贴水包的可行性。结果表明,该项技术的使用可以延长池壁砖的使用寿命,增加炉龄,减轻工人的劳动强度,降低生产成本。填补了国内池壁砖冷却的空白。     

浅谈熔化过程中偏料和分料的解决方法

熔窑的使用寿命往往是决定一个窑期长短的关键因素，而熔窑使用寿命的长短则与各个部位耐火材料的选择和日常的生产操作方法有密切关系。在正常状态下，影响熔窑寿命较为直接的当为池壁砖，再直接一点说是上层池壁砖。池壁砖的使用年限与……     

格法玻璃窑池壁、C型砖再利用技术

通过对池壁砖、C型砖内在质量的分析 ,以及切割技术、质量标准和实际使用经验 ,介绍了电熔 AZS池壁砖、 C型砖的再利用技术。     

玻璃熔窑整块池壁砖使用时的注意事项

阐述了玻璃熔窑熔化部池壁砖的使用寿命是影响熔窑寿命的主要因素，了池壁砖在砌筑，安装，使用过程中的注意事项。     

熔铸AZS池壁砖严重的内在品质缺陷原因分析与控制

熔铸AZS池壁砖局部有聚集超量玻璃相成分，是玻璃窑炉运行的一个安全隐患。通过对熔铸AZS池壁砖严重的内在品质缺陷原因的研究分析，找出控制此类缺陷的方法，改进电熔砖浇注方法和优化砂型工艺，以提高电熔砖外观质量和内在品质，杜绝池壁砖聚集超量玻璃相，消除玻璃窑炉运行中的安全隐患。     

熔铸锆刚玉砖生产中的树脂砂造型工艺的探讨

阐述了熔铸锆刚玉砖的材料和生产特点及树脂砂造型工艺在熔铸锆刚玉砖生产中的优点和容易出现的问题,对如何改进树脂砂造型工艺在熔铸锆刚玉砖生产中的应用和提高熔铸锆刚玉砖产品质量和外观色泽进行了探讨。     

Application of GPC in the Study of Stereospecific Block Copolymers

Abstract

Three different techniques involved in the preparation of Stereospecific block copolymers were studied using gel permeation chromatography (GPC). These techniques involved the use of a monofunctional organo-lithium catalyst, a difunctional organolithium catalyst, and a combination of a monofunctional organolithium catalyst and a coupling technique. GPC curves were obtained on the block copolymers using two different column sequences and solvents. The ABA block copolymers studied contained styrene, vinyl toluene, or α-methyl styrene as thermoplastic monomers and butadiene as the elastomeric monomer. The results obtained showed that block copolymers prepared using monomers and catalyst systems free of impurities generally exhibited single peaked GPC curves. In systems where impurities were found to be present, small amounts of A block homopolymer and AB block copolymer were formed. In such cases, the GPC curves were observed to have two or three peaks.     

三足式离心机甩块断裂故障分析

通过对三足式离心机甩块的强度分析建立了甩块强度的数学模型。对模型的分析表明 ,在正常工作条件下 ,甩块的强度与甩块的截面尺寸无关 ,只与甩块运动的线速度、甩块物质的密度以及甩块所对应旋转中心的弧度有关 ;同时指出甩块所受的向心力是甩块所受的正压力与甩块自由端所提供的拉力的合力。据此判断发现了实际工作中甩块机构在安装过程中存在的问题 ,并使其问题得到解决。     

The effect of block lengths on micelle structure in blends of styrene-isoprene diblock copolymer and poly(vinyl methyl ether)

The micellar structure of styrene-isoprene diblock copolymer and poly(vinyl methyl ether) blends was investigated by using small-angle X-ray scattering and transmission electron microscopy techniques. In order to determine the effect of styrene block length on the formation of micellar structure, three sets of diblock copolymers, with near-identical isoprene block molecular weights, but with different styrene block lengths were studied. With modeling based on the polydisperse Percus-Yevick hard sphere fluid model, the structural parameters characterizing the micelles were determined as a function of copolymer concentrations, temperature, and copolymer block lengths. The core radius was found to decrease on increasing the length of styrene block. The degree of swelling of the corona by PVME increased steadily with increasing the styrene block length.     

双响应性嵌段聚合物的纳米孔开关效应的计算机模拟

利用计算机模拟方法(耗散粒子动力学)研究了双响应性嵌段聚合物修饰的纳米孔的开关效应。通过在纳米孔内接枝具有温度和pH响应的嵌段聚合物(N-异丙基丙烯酰胺和丙烯酸),研究不同嵌段序列(即wall-PNIPAM-PAA或wall-PAA-PNIPAM)对纳米孔开关效应的影响,结果表明,只有wall-PNIPAM-PAA嵌段序列可以实现纳米孔在不同条件下的开关效应。同时还探究了接枝密度、链长和嵌段比例对纳米孔开关效应的影响,结果表明,中高等接枝密度、适合的链长和中等比例的嵌段比可以实现不同特征的纳米孔,用于控制纳米孔的开关效应。     

Effects of Polystyrene Block Content on Morphology and Adhesion Property of Polystyrene Block Copolymer

Effects of polystyrene block content on adhesion property and phase structure of polystyrene block copolymers were investigated. Polystyrene-block-polyisoprene-block-polystyrene triblock and polystyrene-block-polyisoprene diblock copolymers with different polystyrene block contents in the range from 13 to 35 wt% were used. In the case of the low polystyrene block content (below 16 wt%), a sea-island structure was observed: near-spherical polystyrene domains having a mean diameter of about 20 nm were dispersed in polyisoprene matrix. The phase structure changed from a sea-island structure to a cylindrical structure with an increase of polystyrene block content (over 18 wt%). Peel strength decreased with an increase of polystyrene block content and the pure triblock copolymers had lower peel strength than their blends with the diblock copolymers. Pulse nuclear magnetic resonance studies indicated that molecular mobility of polyisoprene phase decreased with an increase of polystyrene block content, and the molecular mobility was lower in the pure triblock than in the blend. Thus, the peel strength was found to be related to molecular mobility. The adhesion strength of the block copolymer depended on the molecular mobility: high molecular mobility can promote interfacial adhesion.     

Synthesis and characterization of poly(ϵ‐caprolactone)‐b‐poly(ethylene glycol) block copolymers prepared by a salicylaldimine‐aluminum complex

A series of poly(?‐caprolactone)‐b‐poly(ethylene glycol) (PCL‐b‐PEG) block copolymers with different molecular weights were synthesized with a salicylaldimine‐aluminum complex in the presence of monomethoxy poly(ethylene glycol). The block copolymers were characterized by ¹H NMR, GPC, WAXD, and DSC. The ¹H NMR and GPC results verify the block structure and narrow molecular weight distribution of the block copolymers. WAXD and DSC results show that crystallization behavior of the block copolymers varies with the composition. When the PCL block is extremely short, only the PEG block is crystallizable. With further increase in the length of the PCL block, both blocks can crystallize. The PCL crystallizes prior to the PEG block and has a stronger suppression effect on crystallization of the PEG block, while the PEG block only exerts a relatively weak adverse effect on crystallization of the PCL block. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

宽温域阻尼材料用嵌段溶聚丁苯橡胶的合成与性能

以苯乙烯和丁二烯为单体、正丁基锂为引发剂、2,2-二(四氢呋喃)丙烷为调节剂、环己烷为溶剂,采用活性负离子聚合技术设计并合成出两段组成及比例不同的嵌段型溶聚丁苯橡胶（SSBR）,使用核磁共振波谱仪和凝胶渗透色谱仪表征其微观结构、化学组成和分子量及其分布,并采用橡胶拉力机和动态机械分析仪分别对嵌段SSBR硫化胶的力学性能和动态力学性能进行测试。结果表明,嵌段SSBR分子结构满足设计要求;嵌段SSBR硫化胶具有较好的力学性能和动态力学性能;嵌段SSBR的软段与硬段的质量比越高,有效阻尼温域越宽;当软段为结合苯乙烯含量更低的链段,嵌段SSBR有效阻尼温域进一步拓宽;当嵌段SSBR两段结合苯乙烯结构单元质量分数分别为15%和50%且二者质量比为7/3时,损耗因子不小于0.3时的温域超过53 ℃。     

离子液体嵌段聚合物的应用研究进展

对聚合离子液体嵌段共聚物在电解质、CO2分离膜、聚偏氟乙烯(PVDF)膜改性剂等方面的最新应用研究进展进行综述。最后讨论了目前离子液体嵌段聚合物在发展中存在的问题,并展望了离子液体嵌段聚合物的发展前景。     

高发泡EVA膨胀胶块的研制

介绍了一种高发泡乙烯-醋酸乙烯共聚物(EVA)膨胀胶块的制备方法.重点讨论了EVA、发泡剂、发泡促进剂、交联剂、润滑剂、增粘剂及填充荆对发泡性能的影响,确定了膨胀胶块的配方和生产工艺.这类高发泡EVA膨胀胶块目前在汽车NVH(Noise、Vibration、Harshness)领域的应用十分广泛.