Ti (IV) Complexes of Some Heterocyclic Ligands Synthesis, Characterization and Ethylene Polymerization Activity
作者:Hamdi Elagab
DOI:10.13005/ojc/320177
日期:2016.3.25
31 complexes of bis - (benzimidazole, benzothiazole and benzoxazole) compounds with Ti (IV) metal centers were synthesized, characterized, activated with methylalumoxane (MAO) and then tested for catalytic ethylene polymerization. The activities of the various catalysts were found to be functions of the hetero atoms in the ligand frameworks. The highest activity was obtained with 39 / MAO (573 kg PE / mol cat. h). The produced polyethylenes showed high molecular weights (up to 1.5 ×106 g/mol) and broad molecular weight distributions (PD = 65). This could result from different interactions of the MAO counterion with the heteroatoms of the catalyst ligand generating different active sites.
合成了31个双-(苯并咪唑、苯并噻唑和苯并恶唑)化合物与钛(IV)金属中心的配合物,进行了表征,并用甲基铝氧烷(MAO)激活,然后测试了其在催化乙烯聚合中的活性。各种催化剂的活性被发现与配体框架中的杂原子有关。39 / MAO获得了最高活性(573 kg PE / mol cat. h)。所产生的聚乙烯具有高分子量(最高可达1.5 × 10^6 g/mol)和宽的分子量分布(PD = 65)。这可能是由于MAO反离子与催化剂配体中的杂原子之间不同的相互作用生成了不同的活性位点。
POLYARYLENE FIBER WITH IMPROVED HYDROLYTIC STABILITY
申请人:TEIJIN ARAMID B.V.
公开号:US20180223077A1
公开(公告)日:2018-08-09
A polyarylene fiber including 0.1-15% based on the weight of the fiber of an aromatic compound or a combination of aromatic compounds wherein each aromatic compound comprises an aromatic core and at least one of the substituents A or B, where A is represented by formula 1
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and B is represented by formula 2
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Also, a spin dope and a process for manufacturing a polyarylene fiber.
COMPOSITES COMPRISING RIGID-ROD POLYMERS AND GRAPHENE NANOPARTICLES AND PROCESS FOR MAKING THE SAME
申请人:DANG Thuy D.
公开号:US20150218730A1
公开(公告)日:2015-08-06
The present invention relates to composites comprising rigid-rod polymers and graphene nanoparticles, processes for the preparation thereof, nanocomposite films and fibers comprising such composites and articles containing such nanocomposite films and fibers.
Synthesis and characterization of cobalt (II) pincer complexes and their application as dyes in dye-sensitized solar cells
作者:Vindhya Hegde、Sreekala C. O、Naveen V. Kulkarni、Jomon Mathew
DOI:10.1016/j.molstruc.2023.135508
日期:2023.8
calculated. The optical band-gaps of the cobalt complexes were determined by using electronic spectral data and the corresponding electrochemical gaps were obtained from cyclic voltammetry studies. All the cobalt (II) complexes were used as dyes in the dye-sensitizedsolarcell and the photovoltaic parameters of the constructed solarcells were investigated. Complex C7, comprising of bis(benzimidazole) system
使用 NNN 三齿和 NN 双齿钳配体系统制备了一系列八个钴 (II) 钳配合物。使用各种光谱技术和分析方法(包括单晶 X 射线分析)对所有配体和配合物进行了完整表征。通过B3LYP计算方法对所有化合物的分子结构进行了优化,计算了化合物的HOMO-LUMO能隙。钴络合物的光学带隙是通过使用电子光谱数据确定的,相应的电化学带隙是从循环伏安法研究中获得的。所有钴 (II) 配合物都用作染料敏化太阳能电池中的染料,并研究了所构建太阳能电池的光伏参数。复杂的C7,由具有乙烯主链的双(苯并咪唑)系统组成,在所测试的化合物中表现出最高的功率转换效率。
Interpenetrated polymer films
申请人:FOSTER-MILLER INC.
公开号:EP0296823A2
公开(公告)日:1988-12-28
This invention relates in general to the formation of films having a controlled molecular orientation prepared from rod-like extended chain aromatic-heterocyclic ordered polymers, and containing a binder in the micro-infrastructure. Such films have high tensile strength, modulus, and environmental resistance characteristics.