Results 91 to 100 of about 1,886 (220)

Mathematical Modeling of Homopolymerization on Supported Metallocene Catalysts

Macromolecular Materials and Engineering, 2004
AbstractSummary: In this paper, a mathematical model describing olefin polymerization with metallocene catalysts is presented. It is an improvement of a previous model, the “particle growth model” (PGM) proposed by, among others, one of the authors of the present work and derives from the so‐called “multigrane model” (MGM). The main differences between
Alexiadis, Alessio, Andes, Cecily, Ferrari, Daniela, Korber, Frank, Hauschild, Klaus, Bochmann, Manfred, Fink, Gerhard   +6 more
openaire   +3 more sources

Catalytic Reduction of Alkoxysilanes with Borane Using a Metallocene-Type Yttrium Complex

, 2018
The catalytic reduction of alkoxysilanes with the borane HBpin (pin = pinacolato) was achieved using a metallocene-type yttrium complex as a catalyst precursor.
Keiya Aoyagi (1570009), Kazuhiko Sato (1628986), Shigeru Shimada (1716403), Yumiko Nakajima (1696639), Kazuhiro Matsumoto (755239)   +4 more
core   +1 more source

Complex Macromolecular Architectures Utilizing Metallocene Catalysts

Macromolecules, 2003
Graft copolymers having poly(methyl methacrylate), PMMA, backbone and polystyrene, PS, polyisoprene, PI, poly(ethylene oxide), PEO, poly(2-methyl-1,3-pentadiene), P2MP, and PS-b-PI branches were prepared using the macromonomer methodology and high-vacuum techniques. The methacrylic macromonomers, mMM, were synthesized by anionic polymerization, whereas
Batis, C., Karanikolopoulos, G., Pitsikalis, M., Hadjichristidis, N.   +3 more
openaire   +2 more sources

Theoretical-studies of Metallocene Polymerization Catalysts

, 1996
Theoretical-studies of Metallocene Polymerization ...
FAGLIONI, Francesco, C. BRANDOW, E. P. BIERWAGEN, W. A. GODDARD   +3 more
core  

Fragmentation behavior of silica-supported metallocene/MAO catalyst in the early stages of olefin polymerization

, 2005
Polymer particle growth in the early stages of olefin polymerization has been investigated using metallocene/methylaluminoxane (MAO)/silica catalyst systems. Scanning electron microscopy (SEM) has been used to characterize the surface and cross-sectional
Zheng, X Xuejing, Zheng, XJ, Smit, M, Loos, J Joachim, Smit, M., Chadwick, JC, Zheng, X., Smit, M Madri, Chadwick, JC John, Loos, J, Chadwick, J.C., Loos, J.   +11 more
core   +1 more source

Degradation behavior of polymer blend of isotactic polypropylenes with and without unsaturated chain end group

Science and Technology of Advanced Materials, 2008
In this work, the relationship between the unsaturated chain end group content and the thermal oxidative degradation rate was systematically studied with binary polymer blends of isotactic polypropylene (iPP) with and without the unsaturated chain end ...
Hisayuki Nakatani et al
doaj  

Control of Polymer Particle Size by Supported Metallocene Catalysts

, 2013
[[abstract]]By utilizing a pre-mixing method, we can prepare a supported metallocene catalyst producing a polyethylene of larger granular size and containing fewer fine particles than that prepared by the conventional adsorption of metallocene on a MAO ...
Lin, Chiu-Hsun
core  

Porous Organic Polymers-Supported Metallocene Catalysts for Ethylene/1-Hexene Copolymerization

, 2018
Porous organic polymers (POPs) have received much attention in adsorption, separation, and catalysis. In this paper, porous organic polymers with different pore structure were used as metallocene catalyst supports, and ethylene/1-hexene copolymerizations
Xiaoyu Han, Renwei Xu, Xiong Wang, Feng Ren, Yongxiao Bai   +4 more
core   +1 more source

C-13-enriched end groups of poly(3-methyl-1-pentene) prepared in the presence of metallocene catalysts

, 1996
Polymerization of both (S)-3-methyl-1-pentene and (R,S)-3-methyl-1-pentene in the presence of two metallocene catalysts prepared from metallocene precursors of different symmetry (C-2 and C-s) and C-13-enriched MAO shows that the insertion of the monomer
LONGO, Pasquale, OLIVA, Leone, A. Zambelli   +2 more
core   +1 more source

(Butadiene)metallocene/B(C₆F₅)₃ Pathway to Catalyst Systems for Stereoselective Methyl Methacrylate Polymerization:  Evidence for an Anion Dependent Metallocene Catalyzed Polymerization Process

, 2016
The ansa-zirconocene dichlorides [Me2Si(C5H4)(3-R-C5H3)]ZrCl2 7a−e (R = H, CH3, cyclohexyl, −CHMe2, −CMe3) were reacted with butadiene−magnesium to yield the respective (η4-butadiene)metallocenes 17a−e. The chiral examples give a mixture of two s-cis and
Cun Wang (283325), Stéphane Bredeau (2720308), Joachim W. Strauch (2724091), Gerhard Erker (1443580), Jean-Luc Fauré, (2724094), Heinrich Luftmann (2205811), Gerald Kehr (1443583), Roland Fröhlich (2430502)   +7 more
core   +2 more sources