Results 91 to 100 of about 6,795 (264)
Human flaws and logical tools in engineering
The Canadian Journal of Chemical Engineering, Volume 103, Issue 8, Page 3512-3520, August 2025.Abstract This paper explores the limitations of human cognition, especially in engineering research, emphasizing the need for mathematical models and methods to guide decision‐making and theory validation. While human cognition excels in certain tasks, it is prone to biases that can distort our understanding.
André C. R. Martins
wiley +1 more source
Polímeros, 2007 Catalisadores envelhecidos em diferentes tempos (0, 5, 15, 40, 80 e 160 dias) e diferentes temperaturas (10, 25 e 40 °C) foram testados na polimerização 1,4-cis do 1,3-butadieno.
Ivana L. Mello +3 more
doaj +1 more source
Threshold effect of residual catalyst on volume resistivity of polypropylene polymers
High Voltage, Volume 10, Issue 4, Page 939-952, August 2025.Abstract Polypropylene (PP) has become the focus of research and development of recyclable polymer dielectric materials because of its excellent electrical and thermal properties. The residual catalyst after PP polymerisation is the main part of ash. It was found that ash particles are uniformly dispersed in the PP matrix.
Xinhua Dong +11 more
wiley +1 more source
Nanoscale Research Letters, 2018 Reduced graphene oxide/SiO2 (RGO/SiO2) serving as a novel spherical support for Ziegler-Natta (Z-N) catalyst is reported. The surface and interior of the support has a porous architecture formed by RGO/SiO2 sandwich structure.
Enqi Su +7 more
doaj +1 more source
Modeling and Optimization of propylene polymerization with branching [PDF]
, 2014 A kinetic model has been proposed to fit the experimental data (2003) available from the open literature for branched propylene polymerization system. The present system considered is a binary catalyst system, in which the first catalyst produces the ...
Majumdar, S +2 more
core +2 more sources
Polímeros, 2005 Atualmente, há uma grande demanda pelo polibutadieno com alto teor de unidades 1,4-cis, devido às suas excelentes propriedades físicas, tais como alta resistência à abrasão, baixo desenvolvimento de calor, baixa resistência ao rolamento, maior ...
Denise S. S. Nunes +2 more
doaj +1 more source
ANALYSIS OF MOLECULAR CHARACTERISTICS OF THE ISOPRENE POLYMERIZATION PRODUCT ON A ZIEGLER-NATTA TITANIUM CATALYST BY MATHEMATICAL MODELING [PDF]
, 2020 Eldar Miftakhov +2 more
openalex +1 more source
ESR Studies on Ziegler-Natta Catalyst Systems
The Journal of the Society of Chemical Industry, Japan, 1970 各種 TiCl3 の ESR 測定を行なった。TiCl3 (A型あるいはH型) では, TiCl3 (AA型) に見られるような g 値 1.94 の鋭い収は認められなかった。しかし, TiCl3 (A型あるいはH型) をボールミル磨砕した試料からは, g 値 1.94 の吸収が認められた。 さらに Ticl3 (A型) に, オレフィンあるいはアルキルアルミニウムを添加するとこの吸収が出現する。TiCl3 (AA型) に対する各種アルキルアルミニウムの影響を ESR で調べた。g 値 1.97 の吸収強度は, 重合活性序列 AlEt3>ALEt2Cl>AlEtCl2≒0 と非常に良い相関を示していることが判った。TiCl3 (AA型)-AlEt3, TiCl3 (AA型)-AlEt2Cl ...
Ichiro OKURA +2 more
openaire +2 more sources
Polímeros, 2000 Foi utilizado o sistema catalítico tipo Ziegler-Natta modificado, constituído por TiCl4/I2/Al(i-Bu)3 para a síntese de polibutadieno com alto teor de unidades 1,4-cis.
Neusa M. T. Pires +2 more
doaj +1 more source
UHMWPE/HDPE in-reactor blends, prepared by in situ polymerization: synthetic aspects and characterization [PDF]
, 2017 This work covers the synthesis and characterization of in-reactor Ultra-High Molecular Weight Polyethylene/ High Density Polyethylene, UHMWPE/HDPE, blends by in situ polymerization in a single reactor, through dual catalyst immobilization. These blends
Cerrada, M. L. +8 more
core +4 more sources