Development of a Large-Scale Stopped-Flow System for Heterogeneous Olefin Polymerization Kinetics

2012 ◽  
Vol 6 (6-7) ◽  
pp. 275-279 ◽  
Author(s):  
Toshiaki Taniike ◽  
Shinya Sano ◽  
Mitsuhiro Ikeya ◽  
Vu Quoc Thang ◽  
Minoru Terano
Keyword(s):  
Large Scale ◽  
Olefin Polymerization ◽  
Flow System ◽  
Polymerization Kinetics ◽  
Stopped Flow

scholarly journals Development of Large-Scale Stopped-Flow Technique and its Application in Elucidation of Initial Ziegler–Natta Olefin Polymerization Kinetics

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1012 ◽  
Author(s):  
Ashutosh Thakur ◽  
Toru Wada ◽  
Patchanee Chammingkwan ◽  
Minoru Terano ◽  
Toshiaki Taniike
Keyword(s):  
Active Sites ◽  
Large Scale ◽  
Olefin Polymerization ◽  
Polymerization Kinetics ◽  
Propylene Polymerization ◽  
Time Range ◽  
Stopped Flow ◽  
Chemical Transformations ◽  
Polymerization Catalysis ◽  
Short Period

The stopped-flow (SF) technique has been extensively applied to study Ziegler–Natta (ZN) olefin polymerization kinetics within an extremely short period (typically <0.2 s) for understanding the nature of the active sites as well as the polymerization mechanisms through microstructure analyses of obtained polymers. In spite of its great applicability, a small amount of polymer that is yielded in a short-time polymerization has been a major bottleneck for polymer characterizations. In order to overcome this limitation, a large-scale SF (LSF) system has been developed, which offers stable and scalable polymerization over an expanded time range from a few tens milliseconds to several seconds. The scalability of the LSF technique has been further improved by introducing a new quenching protocol. With these advantages, the LSF technique has been effectively applied to address several unknown issues in ZN catalysis, such as the role of physical and chemical transformations of a catalyst on the initial polymerization kinetics, and regiochemistry of ZN propylene polymerization. Here, we review the development of the LSF technique and recent efforts for understanding heterogeneous ZN olefin polymerization catalysis with this new system.

scholarly journals Time-resolved detection of SDS-induced conformational changes in α-synuclein by a micro-stopped-flow system

RSC Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 1086-1097
Author(s):  
Shunki Takaramoto ◽  
Yusuke Nakasone ◽  
Kei Sadakane ◽  
Shinsaku Maruta ◽  
Masahide Terazima
Keyword(s):  
Conformational Changes ◽  
Flow System ◽  
Stopped Flow ◽  
Time Resolved ◽  
Sds Micelles ◽  
Conformation Changes ◽  
System P

Dynamics of conformation changes of α-synuclein induced by the presence of SDS micelles are revealed using time-resolved diffusion, CD, and FRET measurements combined with a micro-stopped flow system.

scholarly journals A micro-volume adaptation of a stopped-flow system; use with μg quantities of muscle proteins

2019 ◽  
Vol 581 ◽  
pp. 113338
Author(s):  
J. Walklate ◽  
Zoltan Ujfalusi ◽  
Vincent Behrens ◽  
Edward J. King ◽  
Michael A. Geeves
Keyword(s):  
Flow System ◽  
Stopped Flow ◽  
Muscle Proteins ◽  
System Use

Stopped-flow measurements of CO and O2 uptake by hemoglobin in sheep erythrocytes

1963 ◽  
Vol 18 (1) ◽  
pp. 158-165 ◽  
Author(s):  
John A. Sirs ◽  
F. J. W. Roughton
Keyword(s):  
Linear Relation ◽  
Flow System ◽  
Stopped Flow ◽  
Constant Flow ◽  
Dissolved Gas ◽  
O2 Uptake ◽  
Flow Measurements ◽  
Sheep Erythrocytes ◽  
Flow Method ◽  
Comparison Of The Results

A stopped-flow method is described to measure spectrophotometrically the rates of uptake of CO and O2 by the hemoglobin of intact sheep erythrocytes. A comparison of the results obtained with the constant flow system has led to further refinement of the latter procedure. A linear relation is found between the rate of uptake and the concentration of the dissolved gas, and the initial percentage rate of saturation is independent of the concentration of the erythrocytes. Submitted on September 21, 1961

A novel high-vacuum and variable-temperature stopped-flow device for high-purity polymerization kinetics

1991 ◽  
Vol 47 (1) ◽  
pp. 271-275 ◽  
Author(s):  
M. Villesange ◽  
A. Rives ◽  
C. Bunel ◽  
J-.P. Vairon ◽  
M. Froeyen ◽  
...  
Keyword(s):  
High Purity ◽  
Variable Temperature ◽  
High Vacuum ◽  
Polymerization Kinetics ◽  
Stopped Flow ◽  
Flow Device

New Quenching Method for Improving Large-Scale Stopped-Flow Technique

2014 ◽  
Vol 8 (11) ◽  
pp. 766-770 ◽  
Author(s):  
Ashutosh Thakur ◽  
Supawadee Poonpong ◽  
Minoru Terano ◽  
Toshiaki Taniike
Keyword(s):  
Large Scale ◽  
Stopped Flow ◽  
Quenching Method

scholarly journals Continuous High-Flow System to Trap and Separate Magnetic Particles from Liquid Mixtures

2018 ◽  
Author(s):  
Georgios Banis ◽  
Maria Elisavet Kouli ◽  
Evangelos Hristoforou ◽  
Angelo Ferraro
Keyword(s):  
Iron Oxide ◽  
Flow Rate ◽  
Large Scale ◽  
Magnetic Particles ◽  
Flow System ◽  
Scaling Up ◽  
Liquid Solution ◽  
Liquid Mixtures ◽  
Separation Process ◽  
High Flow

Bio-separation of natural molecules as well as clinical compounds has been constantly developed in last decades. Several techniques are available but the majority of them presents drawbacks such us impossibility to be applied for industrial purposes. The main limitations for the scaling up are high costs and the fact that the devices work with microfluid dynamics. Nevertheless, magnetic bio-separation is considered the most prone to be used for large scale applications. Herein, we propose a simple magnetic separation method that is not based on microfluid dynamics, can work in a continuous- and high-flow rate and can be easily automated in order to be used for standard separation purposes. It is based on the use of an anisotropic flexible ferric magnetic strip, Teflon hoses and a pumping device. We show the modelling of the separation process along with an experimental test on iron oxide magnetic particles. The results showed that it is possible to remove, and separately collect, more than 92% of magnetic particles from a liquid solution of 100 ml in roughly 15 minutes.

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