A facile one‐step method for spherical support preparation of Ziegler‐Natta catalyst

This study reports a novel one‐step method to synthesize a new spherical support for Ziegler‐Natta catalyst under moderate condition. The support is obtained from a dispersion system where the particle stabilizer polyvinylpyrrolidone plays a main role to stabilize the spherical particles. The new chemical of the support is CH₃CH₂OMgOCH(CH₂Cl)₂, which is first reported here, has been approved by newly filed patents and also confirmed by solution NMR, solid state NMR, pyrolysis‐gas chromatography‐mass spectrometry (Py‐GC‐MS), and ICP‐MS. The support and catalyst particles have uniform distributions. The catalyst prepared from this support has been evaluated with high activity. The polypropylene obtained has high isotacticity. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 41014.     

Synthesis,characterization, and gas transport properties of novel iptycene-based poly[bis(benzimidazobenzisoquinolinones)]

Two novel iptycene-based tetramine monomers were successfully synthesized by nucleophilic aromatic substitution of triptycene-1,4-diol and pentiptycene-6,13-diol with 5-chloro-2-nitro-aniline, followed by reduction, respectively. These monomers were polymerized with 4,4-binaphthyl-1,1,8,8-tetracarboxylic dianhydride to obtain two novel iptycene-based poly[bis(benzimidazobenzisoquinolinones)]s (PBIBI–TPD and PBIBI–PPD) by a one-step, high-temperature solution polycondesation. Incorporation of iptycene groups especially the pentiptycene group in the polymer backbones improved their solubility and thermal stability. The resulting membranes exhibited good gas permeability owing to the high internal free volume elements introduced by the iptycene groups as well as high gas selectivity due to the restricted local segmental mobility arising from the interlocking of these groups in the polymer backbone. The membrane of PBIBI–PPD showed high CO₂ permeability (112 barrer) and moderately good CO₂/N₂ and CO₂/CH₄ selectivity (22 and 31) for mixed gas separation.     

互穿结构涂料印花粘合剂的合成与应用

以聚丙烯酸酯乳液作为第一网络体系,以改性聚乙烯醇为第二网络体系,制备互穿结构涂料印花粘合剂。分析了互穿结构聚合物的合成机理、微观形态、力学性能,通过讨论2种网络结构的配比、粘合剂用量,优化了粘合剂的合成工艺。将互穿结构粘合剂应用于棉织物涂料印花,产品表现出优良的手感和色牢度。     

纸板类儿童卡书抗弯曲性能影响因素研究

文章针对四种制备儿童卡书的卡纸进行研究,分析了卡纸纤维结构类型和表面粗糙度对儿童卡书变形度的影响。对水性胶粘剂固含量与儿童卡书弯曲度的关系研究发现胶粘剂固含量在60%~65%时,制备的卡书抗弯曲性能较好。此外,研究发现后处理环境条件选用温度23±3℃,湿度50±5%的标准条件,后处理时间为1个月左右得到的儿童卡书的弯曲变形度最小。     

泵并联运行流量增量的影响因素与并联运行设计的初探

通过对福建LNG接收站现有管路特性曲线和3台海水泵并联运行流量-扬程曲线的形状进行分析,分析了影响泵并联运行时流量增量的因素,以及泵并联运行时可能出现的过载问题,在此基础上提出了福建LNG接收站工艺海水泵并联运行设计时应该注意的问题,为并联运行工艺海水泵的设计和选型提供参考。     

分析化验技术及标准在天然气处理厂中的应用

简要介绍了天然气的分类,及天然气处理过程中相关气体、液体及固体样品的分析测试方法和标准。论述了相关分析化验技术及标准在国内、外有代表性的两个大型天然气处理厂新疆大北项目和土库曼斯坦南约洛坦项目中的应用。     

一种吲哚基姜黄素类似物的合成及其抗氧化活性研究

吲哚-3-甲醛与2-羟基-5-甲氧基苯乙酮进行羟醛缩合反应,生成一种吲哚基姜黄素类似物1-(2-羟基-5-甲氧基苯基)-3-(3-吲哚基)-2-烯-1-酮,在不同的催化剂、温度、溶剂等条件下,探索研究合成反应所需的最优工艺条件,采用合适的方法分离提纯得到纯净产品。通过熔点测定、氢核磁共振分析法、质谱分析法等对合成产物进行分析,并研究其抗氧化生物活性。结果表明,该化合物均具有清除DPPH自由基、羟基自由基的能力,表现出明显的抗氧化活性。     

现代《化工原理》教学中贯穿工程观念与创新能力的重要性

工程技术素养是现代工科大学生最重要的素质之一,同时,在这个快速发展的时代,创新能力也是一名优秀的科技人员所必须具备的特征。文章以培养综合能力较强的化工专业技术人才为主要目标,结合多年的教学经验,分别从理论教学、实验教学、课程设计等方面探讨了如何在化工原理教学中引导学生对工程观念的重视,以及培养学生创新能力的具体方法。     

基于市场导向的新疆地区炼焦煤资源的开发与实践

拜城县众泰煤焦化有限公司针对新疆地区冶金焦炭市场需求,对新疆地区炼焦煤资源综合利用的问题进行立项研究,丰富和完善公司产品配方库,抢占市场机遇,取得了显著的经济效益。     

航空煤油实际胶质测量不确定度的评估

根据《测量不确定度评定与表示》[1]测量要求,对航空煤油实际胶质测量不确定度进行合理评估,找到了影响测定结果准确性的主要因素,得出该方法的扩展不确定度u=0.4 mg/100 mL。