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Control of Molecular Weight Distribution for Polypropylene Obtained by Commercial Ziegler-Natta Catalyst: Effect of Electron Donor
Polymerization of propylene was carried out using a MgCl2-supported TiCl4 catalyst in conjunction with triethylaluminium (TEA) as the cocatalyst and various types of alkoxy silane compounds as an external donor. The effect of the external donor on the performance of the catalyst with different internal donors was investigated. The polydispersity index (PDI) of polypropylene (PP) obtained with th...
http://www.polymer.cn//ss/polyhx/publicationsshow_12721.html |
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Control of Molecular Weight Distribution for Polypropylene Obtained by a Commercial Ziegler–Natta Catalyst: Effect of a Cocatalyst and Hydrogen
The polymerization of propylene was carried out with an MgCl2-supported TiCl4 catalyst (with diisobutyl phthalate as an internal donor) in the absence and presence of hydrogen (H2) as a chain-transfer agent. Different structures of alkylaluminum were used as cocatalysts. The effects of the alkyl group size of the cocatalyst, H2 feed, and feed time on the propylene polymerization behaviors were i...
http://www.polymer.cn//ss/polyhx/publicationsshow_12720.html |
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Optimization of mechanical and dielectric properties of poly(urethane–urea)-based dielectric elastomers via the control of microstructure
In this work, we fabricated novel poly(urethane–urea) (PUU)-based dielectric elastomers using a hydroxylterminated butadiene–acrylonitrile copolymer (HTBN) as the soft segment and hexamethylene diisocyanate (HDI) and 3,30-dimethyl-4,40-diamino dicyclohexyl methane (DMDC) as hard segments. The effect of hard segment (HS) content on the hard domain (HD) structure, morphology, dielectric and mechan...
http://www.polymer.cn//ss/yrliang/publicationsshow_12411.html |
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8.【J. Phys. Chem. B】Network Structure Control of Binary Mixed Langmuir Monolayers of Homo-PS and PS-b-P2VP.
Our recent work showed there existed a composition window for mixed Langmuir monolayers of homopolystyrene (h-PS) and a symmetric diblock copolymer polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) to form necklace-network structures at the air/water interface. In order to study further the possible mechanism and control the network structure (i.e., surface coverage and nanoaggregate diameter)...
http://www.polymer.cn//ss/wengangyao/publicationsshow_12242.html |
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[Small 2016, 12, 3400] Biomimicking Nano-Micro Binary Polymer Brushes for Smart Cell Orientation and Adhesion Control
http://onlinelibrary.wiley.com/doi/10.1002/smll.201600634/full
http://www.polymer.cn//ss/xiezhuang/publicationsshow_12109.html |
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Morphological Control of Polymer Spherulites via Manipulating Radial Lamellar Organization upon Evaporative Crystallization: A Mini Review
Yiguo
Li*, Zongbao Wang*,Tianbai He, Morphological Control of Polymer
Spherulites via Manipulating Radial Lamellar Organization upon Evaporative
Crystallization: A Mini Review, Crystals 2017, 7,
115, 1-21.
http://www.polymer.cn//ss/wangzb/publicationsshow_12059.html |
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Stereoselective Copolymerization of Unprotected Polar and Nonpolar Styrenes by an Yttrium Precursor: Control of Polar-Group Distribution and Mechanism
Styrene underwent unprecedented coordination–insertion copolymerization with naked polar monomers (ortho-/meta-/para-methoxystyrene) in the presence of a pyridyl methylene fluorenyl yttrium catalyst. High activity (1.26×106 g·molY-1 h-1) and excellent syndioselectivity were observed, and high-molecular-weight copolymers (24.6×104 gmol-1) were obtained. The insertion rate...
http://www.polymer.cn//ss/dongmeicui/publicationsshow_11955.html |
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Stereoselective Copolymerization of Unprotected Polar and Nonpolar Stryenes by an Yttrium Precursor:Control of Polar-Group Distribution and Mechanism.
Styrene underwent unprecedented coordinationinsertion copolymerization with naked polar monomers (ortho-/ meta-/ para-methoxystyrene) in the presence of a pyridyl methylene fluorenyl yttrium catalyst. High activity (1.26 X 10(6) gmol(Y)(- 1)h (-1)) and excellent syndioselectivity were observed, and high-molecular-weight copolymers (24.6 X 10(4) gmol (-1)) were obtained. The insertion rate of the...
http://www.polymer.cn//ss/dongmeicui/publicationsshow_11863.html |
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Concentration-driven phase control for low temperature synthesis of phase-pure anatase and rutile titanium oxide
It is highly desirable to develop controlled synthetic methods at low temperature (<100 °C) for defined phases of titanium oxide nanoparticle. We present here a simple low temperature approach which is based on the peroxide route. This approach allows the preparation of phase-pure rutile and anatase without the use of any additives or surfactants or external acids. The formation of crystalline...
http://www.polymer.cn//ss/zhangming/publicationsshow_10477.html |
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Solvothermal synthesis of hierarchical Eu2O3 nanostructures templated by PS-b-PMAA: morphology control via simple variation of water contents.
A new method to synthesize hierarchical Eu203 nanostructures via a solvothermal process in N,N''''-dimethyl formamide (DMF) templated by an ionic amphiphilic diblock copolymer polystyrene-block-poly (methacrylic acid) (PS-b一PMAA) has been developed. By simply varying the mass ratio of HZO over DMF from 0 to 20 wt% in the polymer-salt mixed solution, a series of Eu203 morphologies including worm...
http://www.polymer.cn//ss/mengjianqiang/publicationsshow_8854.html |
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