Preparation and properties of modified graphene oxide incorporated waterborne polyurethane acrylate

In this study, a new modifier (KPG) was prepared by modifying graphene oxide with γ‐glycidoxypropyl trimethoxysilane (KH560) and polydimethylsiloxane (PDMS). KPG was in turn added to aqueous urethane acrylate for the fabrication of waterborne polyurethane polyacrylate emulsion modified with KH560‐PDMS composite (KPG/WPUA). Textural characterizations of the KPG/WPUA coating were achieved via Fourier transform infrared, SEM, TGA and AFM techniques, which revealed that the KPG/WPUA film possessed a smooth surface. The synthesized KPG/WPUA films were tested for mechanical properties, hydrophobicity and acid/water corrosion performance which suggested their highly hydrophobic surface. KPG/WPUA with 0.1% KPG showed a contact angle of 118.35°, 30.35° higher than that of pristine WPUA. The KPG/WPUA film exhibited higher thermal stability, i.e. a 5% weight loss temperature of 305 °C, which was 30 °C higher than that of pristine WPUA film. The Young's modulus and elongation at break of the KPG/WPUA film were 34.1 MPa and 74.88% respectively, which were higher than that of WPUA film. Furthermore, KPG/WPUA films exhibited greater resistance (without obvious blistering and the white spotting phenomenon) to H₂O₂, HCl and water corrosion than pristine WPUA. The superior performance of KPG/WPUA films was attributed to the network chain structure formed upon the introduction of KPG into WPUA. The outstanding performance of KPG/WPUA films in terms of mechanical properties, thermal stability and high resistance to acidic and water corrosion makes them interesting alternative contenders for target applications. © 2019 Society of Chemical Industry     

Ionic Liquids‐Based Membranes for Carbon Dioxide Separation

Ionic liquids (ILs) have gained wide‐spread focus owing to its negligible vapor pressure, low heat capacity, high thermal stability, and structural diversity. The solubility and selectivity toward carbon dioxide has made ILs a unique platform that possess the potential in gas separations. In particularly, combining functional ILs with membranes and porous supports is an efficient way to design task‐specific materials for CO₂ separations. This minireview summarizes the developments and advances of ionic liquids‐based membranes for CO₂ separations in recent three years, with an emphasis on the strategy of incorporating ionic liquids and CO₂ separation performance.     

二次铝灰制备微晶玻璃及性能研究

以二次铝灰为主要原料,通过熔融法,经500℃退火、780℃核化以及880℃晶化热处理后制备得到了以钙长石、硅灰石和透辉石为晶相的CaO-MgO-Al2O3-SiO2(CMAS)系灰渣微晶玻璃.采用XRD、DTA、SEM、物化性能测试等研究了铝灰含量对微晶玻璃析晶行为、显微形貌和性能的影响规律.结果表明:铝灰含量为30％的时候微晶玻璃的主晶相为硅灰石,随着铝灰含量的逐渐增加,主晶相变为钙长石.当铝灰含量达到55％的时候,XRD图谱中出现了透辉石的衍射峰.微晶玻璃硬度随着铝灰含量的增加不断增大,密度先降低后增大,耐酸腐蚀性能逐渐降低,耐碱腐蚀性能逐渐增强.     

基于聚乙烯吡咯烷酮合成非离子型水性聚氨酯

以偶氮二异丁氰（AIBN）为引发剂,异丙氧基乙醇（IPGE）和巯基乙醇（MCE）作链转移剂,合成低相对分子质量单端羟基的聚乙烯吡咯烷酮（ PVP）。采用甲苯二异氰酸酯（TDI）、聚四氢呋喃醚二醇（PTMEG,M_n=1 000）为原料, 1,4-丁二醇（BDO）和三羟甲基丙烷（TMP）作小分子扩链剂,添加羟基功能化的 PVP作亲水性链段,合成了以 PVP作为非离子亲水链段的水性聚氨酯分散体。采用傅里叶红外光谱仪（FT-IR）、激光解离基质飞行时间质谱（MALDI-TOF）、凝胶渗透色谱（GPC）等方法对合成的聚乙烯吡咯烷酮及水性聚氨酯进行分析表征。结果表明聚乙烯吡咯烷酮链段可作为水性聚氨酯亲水性链段,并且合成出的非离子聚氨酯乳液具有耐电解质、冻融稳定性好的特性。     

二甲基三硫和β-环柠檬醛的颗粒活性炭吸附机理研究

以饮用水源中2种典型的嗅味物质二甲基三硫和β-环柠檬醛为研究对象,分别从吸附平衡试验和吸附动力学方面进行了颗粒活性炭(GAC)吸附试验.结果表明,GAC吸附二甲基三硫和β-环柠檬醛均同时符合伪1级反应动力学和伪2级反应动力学模型;在4种等温吸附模型中,Freundlich方程能最好地拟合吸附等温线;GAC对二甲基三硫和β-环柠檬醛的吸附容量较大,当二甲基三硫和β-环柠檬醛的初始质量浓度为500μg·L-1时,吸附容量分别达到8.680、16.04L·mg-1;pH＞10时更有利于GAC吸附二甲基三硫,而pH为2～13对β-环柠檬醛的吸附效果无显著影响.     

N-烯丙基苯胺的合成研究

以溴丙烯和苯胺为原料合成了N-烯丙基苯胺,通过IR和~1HNMR对化合物的组成和结构进行了表征,探讨了优化反应条件,该路线具有操作简便、反应快、收率高的特点。     

中美页岩气资源评价的现状及启示

介绍了美国页岩气开发的成功经验以及中国页岩气的开发现状,阐述了我国页岩气勘探开发的基本态势和发展趋势,分析了我国页岩气的资源潜力与分布特征,提出了几点适合我国页岩气发展的建议。     

聚醚酯聚氨酯弹性体的制备与性能研究

以新型的聚醚酯多元醇(PEEP)为原料,制备了浇注型聚氨酯弹性体(PUE),并与聚醚或聚酯多元醇制备的PUE进行了分析比较.结果表明,提高预聚体中NCO基含量,聚醚酯PUE的硬度、强度和耐水解性能升高,伸长率和吸水率则下降;降低PEEP中醚键相对含量,PUE硬度和强度均升高.相同硬段含量下,聚醚酯PUE的力学性能优于聚...     

塔式熔体复合肥造粒工艺物料泵送方案设想和探讨

阐述塔式熔体复合肥造粒工艺在塔顶完成的制浆和造粒工序所存在的问题.设想并介绍采用塔下制浆,然后用液下泵通过管道输送至塔上进行喷淋造粒的方案.