Results 61 to 70 of about 600,113 (211)

Facile Approach to Modulating Stereochemistry in Ring‐Opening Metathesis Polymerization of Cyclooctadiene

Journal of Polymer Science, Volume 64, Issue 19, Page 4037-4046, 1 October 2026.
The stereochemistry of polybutadiene made by ring‐opening metathesis polymerization (ROMP) evolves both during and after polymerization, as secondary metathesis shifts cis‐rich kinetic products toward trans‐rich equilibrium compositions. By tuning catalyst identity, additives, temperature, and reaction time, polybutadienes with 28%–80% trans content ...
Amira S. Eldin, Michael D. Schulz
wiley   +1 more source

Propylene Polymerization Performance with Ziegler-Natta Catalysts Combined with U-Donor and T01 Donor as External Donor

, 2022
In propylene (C3) polymerization with Ziegler-Natta catalyst, not only internal donor but also external donor is very important to make isotactic polypropylene (PP) with higher yield.
Hideo Funabashi, Padavattan Govindaswamy, Emiko Wada, Hiroyuki Kono, Toshiya Uozumi   +4 more
core   +1 more source

Sixtieth Anniversary of Ziegler-Natta Catalysts and Stereospecific Polymerization [PDF]

Kemija u Industriji, 2015
This review article highlights the history of the discoveries of organometallic catalysts and stereospecific polymerization of α-olefins, dienes and a number of vinyl monomers by Karl Ziegler and Giulio Natta sixty years ago, their developments and ...
Janović Z. , Veksli Z.
doaj  

Ti+4 determination in Ziegler–Natta polymerization catalysts via UV‒vis spectroscopy method [PDF]

Polyolefins Journal
The determination of Ti+4 in Ziegler–Natta catalysts is highly relevant for industrial plants that use Ziegler–Natta (ZN) catalysts based on TiCl4 as a source of titanium.
Jonas Biagini, Joao Henrique dos Santos
doaj   +1 more source

Study of Ethylene Polymerization Kinetics by TiCl4/Mg(OC2H5)2 Catalyst and Determination of the Active Sites Concentration [PDF]

علوم و تکنولوژی پلیمر, 2008
Ethylene was polymerized in slurry phase over a TiCl4/Mg(OC2H5)2 catalyst activated by Al(C2H5)3. It was shown experimentally that mass transfer resistance has no effect on polymerization kinetics.
S. Hakim, M.M. Mortazavi
doaj   +1 more source

Additive Manufacturing Engineering for Electrochemistry: Conductive High‐Density Polyethylene Filament Expands the Materials Landscape

Small Science, Volume 6, Issue 10, October 2026.
Conductive high‐density poly(ethylene) (HDPE) is introduced as a new material platform for additive manufacturing electrochemistry, expanding the limited polymer feedstocks currently available. A solvent‐free thermal compounding process incorporating 40 wt% carbon black produced a flexible, plasticizer‐free filament with a low bulk resistivity of 16.4 (
Muhzamil A. Khan, Elena Bernalte, Ridho Asra, Robert S. Tapping, Ana C. M. Oliveira, Alan M. Jones, Rodrigo A. A. Muñoz, Samuel Rowley‐Neale, Robert D. Crapnell, Craig E. Banks   +9 more
wiley   +1 more source

The blocky structure of Ziegler-Natta "random" copolymers: Myths and experimental evidence

, 2020
The crystallization behavior of butene-ethylene random isotactic copolymers prepared with a Ziegler-Natta catalyst, in particular the surprising crystallization of form II of isotactic polybutene in samples with a high ethylene concentration, provides ...
De Rosa C., Malafronte A., Di Girolamo R., Auriemma F., Talarico G., Scoti M., Ruiz De Ballesteros O.   +6 more
core   +1 more source

Organische Trägermaterialien für Ziegler-Natta-Katalysatoren [PDF]

, 2017
Ziel dieser Arbeit war die Entwicklung eines auf einem organischen Trägermaterial basierenden Ziegler-Natta-Katalysatorsystems, welches die erforderliche Fragmentierbarkeit in möglichst kleine Fragmente aufweist.
Nietzel, Sven Ingo
core   +1 more source

Study on the Effects of Temperature, Time and the Policy of Prepolymerization on Particle Morphology in Propylene Slurry Polymerization with Heterogeneous Ziegler-Natta Catalysts [PDF]

علوم و تکنولوژی پلیمر, 2007
The effects of temperature, time and the strategy of prepolymerization were studied on the morphology of polypropylene particles. propylene polymerization was carried out in slurry phase using 4th generation of Ziegler-Natta Catalyst, cyclohexylmethyl ...
G. Pircheraghi, S. Pourmahdian, M. Vatankhah   +2 more
doaj   +1 more source

Potential of Thermoset Polyolefins for FRP Concrete Reinforcing Bars

Polymer Composites, Volume 47, Issue 18, Page 16155-16176, 20 September 2026.
Overview of XLPO and pDCPD resins for FRP reinforcing bars, highlighting resin chemistry, key performance characteristics, fiber sizing interactions, and principal degradation mechanisms in concrete environments. ABSTRACT Although thermoset polyolefins offer resistance to hydrolytic degradation and favorable processing characteristics, their potential ...
Osama Omar, Farzaneh Mahmoudi, Leonidas G. Bachas, Francisco De Caso, Brahim Benmokrane, Antonio Nanni   +5 more
wiley   +1 more source