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Effects of Ligands in Novel Non-titanocene on Syndiotactic Polymerization of Styrene

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Chemical Research in Chinese Universities 1999年第2期15卷 108-111页

作者： ZHOU Nai YAN Weidong XIE Guanghua hu youliang Institute of Chemistry Chinese Academy of SciencesBeijing100080

ＩｎｔｒｏｄｕｃｔｉｏｎＳｙｎｄｉｏｔａｃｔｉｃｐｏｌｙｓｔｙｒｅｎｅ（ｓＰＳ）ｉｓａｈｉｇｈｌｙｃｒｙｓｔａｌｉｎｅｐｏｌｙｍｅｒｗｉｔｈａｍｅｌｔｉｎｇｔｅｍｐｅｒａｔｕｒｅｏｆａｂｏｕｔ２７０℃ａｎｄａｇｌａｓ... 详细信息

ＩｎｔｒｏｄｕｃｔｉｏｎＳｙｎｄｉｏｔａｃｔｉｃｐｏｌｙｓｔｙｒｅｎｅ（ｓＰＳ）ｉｓａｈｉｇｈｌｙｃｒｙｓｔａｌｉｎｅｐｏｌｙｍｅｒｗｉｔｈａｍｅｌｔｉｎｇｔｅｍｐｅｒａｔｕｒｅｏｆａｂｏｕｔ２７０℃ａｎｄａｇｌａｓｓｔｒａｎｓｉｔｉｏｎｔｅｍｐｅｒ...

关键词： Titanium()diketonate Titanium()8hydroxyquinolinate Syndiotactic polystyrene Catalytic performance Syndiotactic polystyrene, Catalytic performance

The influence of the metal net charge of non-metallocene early transition metal catalyst on the ethylene polymerization activity

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Chinese Science Bulletin 2008年第20期53卷 3164-3168页

作者： WU ChunHong LI huaYi FENG YuQi hu youliang Department of Chemistry Wuhan University Wuhan 430072 China Joint Laboratory of Polymer Science and Materials and Key Laboratory of Engineering Plastics Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

The net charges on central metals of a serial non-metallocene early transition metal catalysts (FI catalyst) with similar steric hindrance were caculated with MM-QEq (molecular mechmism-charge equilibration) method and associated with ethylene polymerization activities of these FI catalyts. It was found that the activity increased with the net charge on metal if ignoring the influence of the steric hindrance. In other words, introduction of strong and/or more electron-withdrawing groups onto the ligand of FI catalyst would enhance the activity of the catalyst. This conculsion gave a direction to designing new FI catalyst with higher activity.

关键词：乙烯聚合活性分子机制电荷平衡净电荷催化剂

The effect of co-catalysts on the morphology of isotactic polypropene prepared using metallocene catalyst

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Chinese Science Bulletin 2002年第10期47卷 810-813页

作者： ZHANG Mingge XU Demin HONG Han GUO Cunyue hu youliang State Key Lab of Engineering Plastics Center for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing Lab of CatalysisKey Lab ot Catalysis of China National Petroleum CorporationBeijing 100080China Graduate School of the Chinese Academy of Sciences Beijing 100030China

SiO2/rac-Me2Si[2-Me-4-Naph-Ind]2ZrCl2 was prepared and different co-catalysts were used in bulk polymerization of propene. The morphology of polypropene could be controlled by altering the co-catalysts. The isotactic polypropene with good morphology and high bulk density were prepared. The formation mechanism of active centers was proposed, by which the effect of co-catalysts on the morphology of polypeopene was analyzed.

关键词： metallocene co-catalyst supporting morphology of polypropene.

Preparation of PE/MMT nanocomposite by monomer intercalation and in situ copolymerization

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Chinese Science Bulletin 2002年第15期47卷 1267-1270页

作者： GUO Cunyue MA Zhi ZHANG Mingge HE Aihua KE Yucai hu youliang State Key Lab of Engineering Plastics Center for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing Lab of CatalysisChina National Petroleum Corporation Key Lab of Catalysis Graduate School of the Chinese Academy of Sciences Beijing 100039China

The catalyst {[(2-ArN=C(Me))2C5H3N]FeCl3} (Ar = 2-C6H4(i-Pr)) with methylaluminoxane (MAO) as co-catalyst was intercalated between layers of montmorillonite (MMT) for ethylene oligomerization. Metallocene catalyst Me2Si(Ind)2ZrCl2 and MAO was then added to form a dual functional catalytic system. A PE/MMT nanocomposite was prepared by copolymerization of ethylene with α-olefins produced in situ from ethylene over the dual functional catalytic system. The catalytic system was of high polymeric activity. The resultant PE/MMT nanocomposites were stable and got increases in tensile strength and temperature of maximum weight loss (Tonset).

关键词： PE/MMT nanocomposites in situ intercalation copoly-merization.

Preparation of long-branched polyethylene by in situ poly-merization using late transition metal and metallocene catalysts

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Chinese Science Bulletin 2001年第24期46卷 2054-2057页

作者： LIU Zhongyang GUO Cunyue MAZhi WANG Jun XU Demin HE Dawei hu youliang State Key Lab of Engineering Plastics Center for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing 100080China Beijing Lab of Catalysis China National Petroleum Corporation Key Lab of CatalysisBeijing 100080China

An in situ polymerization method was investigated to prepare long-branched polyethylene (LBPE) with ethylene alone and a single cocatalyst, methylalumoxane (MAO), by using a dual functional catalytic system containing late transition metal oligomerization catalyst and metal-locene copolymerization catalyst. The obtained long-branched polyethylene has the characteristics of low melting point, high activity and well-dispersed sequence distribution.

关键词： long-branched polyethylene in situ polymerization late transition metal catalyst metallocene catalyst.

PARTIALLY DISENTANGLEMENT OF MONO-DISPERSED POLYPROPYLENE AND ITS PROPERTY IN THE MELT

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PARTIALLY DISENTANGLEMENT OF MONO-DISPERSED POLYPROPYLENE AN...

EXFOLIATED PP/CLAY AND INTERCALTED PU/CLAY NANOCOMPOSITES

International Symposium on Engineering Plastics EP’2001 Beijing

作者： Qing Sun Gi Xue youliang hu Department of Polymer Science & Engineering Nanjing University State Key Laboratory of Engineering Plastics

＜正＞In general,polymer chains are in the state of *** is well known that entanglement is important in determining rheological and dynamic properties of *** solution theory indicates that there is an overlap concentr...

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EXFOLIATED PP/CLAY AND INTERCALTED PU/CLAY NANOCOMPOSITES

乙烯原位共聚法制备线性低密度聚乙烯的研究进展

International Symposium on Engineering Plastics EP’2001 Beijing

作者： Jisheng Ma Zongneng Qi youliang hu State Key Laboratory of Engineering Plastics Center for Molecular ScienceInstitute of ChemistryChinese Academy of Sciences

＜正＞Filling modification on polymer is one of the most methods to improve the properties of polymer *** shown in Figure 1,there are two important problems must be resolved to prepare polymer composites via filling *** is the dispersibility of filler into polymer matrix and another is the interface between filler and *** distribution of filler in polymer matrix can be described by the morphology of the

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石油化工 2005年第10期34卷 911-916页

作者：胡友良张志成中国科学院化学研究所高分子科学与材料联合实验室工程塑料重点实验室北京100080

系统综述了近二十年来乙烯原位共聚法制备线性低密度聚乙烯的研究开发工作。按照共聚催化剂的不同,分为Z ieg ler-Natta催化体系、茂金属催化体系及非茂金属催化体系3类催化体系,着重阐述了乙烯原位共聚催化体系的特点、得到的聚合物的... 详细信息

系统综述了近二十年来乙烯原位共聚法制备线性低密度聚乙烯的研究开发工作。按照共聚催化剂的不同,分为Z ieg ler-Natta催化体系、茂金属催化体系及非茂金属催化体系3类催化体系,着重阐述了乙烯原位共聚催化体系的特点、得到的聚合物的特征及乙烯原位共聚法的优缺点等。

关键词：原位共聚线性低密度聚乙烯 Ziegler-Natta 茂金属双功能催化体系催化剂

A mini review of the recent progress in coarse-grained simulation of polymer systems

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Chinese Journal of Structural Chemistry 2024年第5期43卷 38-57页

作者： huimin Gao Zhuochen Yu Xuze Zhang Xiangkun Yu Jiyuan Xing youliang Zhu hu-Jun Qian Zhong-Yuan Lu State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun130023China

Molecular dynamics simulation is a powerful tool in the study of polymeric *** various simulation methods,coarse-grained(CG)model is particularly impactful because it effectively reduces the computational complexity and enables the simulation of large-scale polymer *** this review,we briefly summarize recent progresses in our group on the development of CG simulation methods,models,as well as in the software *** compiling the CG models and various simulation methods,we have successfully developed a GPU-accelerated large-scale molecular simulation toolkit(GALAMOST),which provides an efficient platform for polymer *** further developed the new-generation PyGAMD(Python GPU-Accelerated MD Software,website:)software based on the Python platform,which makes the polymer simulation more powerful,flexible and *** addition,some recent application cases in different polymer systems are also *** aspiration of this review is to assist researchers in understanding the role of molecular simulations in the design and development of advanced polymer materials not only for academic researches,but also for possible industrial applications.

关键词： Polymer Molecular simulation Software Multiscale method Coarse-grained dynamics simulation