In situ FT-IR spectroscopy study on the conformational changes of quenched isotactic polypropylene during stepwise heating

2011 ◽  
Vol 67 (8) ◽  
pp. 1649-1659 ◽  
Author(s):  
Junchai Zhao ◽  
Zheng Peng ◽  
Jianmin Zhang ◽  
Gengchen Li
Keyword(s):  
Ir Spectroscopy ◽  
Conformational Changes ◽  
Isotactic Polypropylene ◽  
Spectroscopy Study ◽  
Stepwise Heating ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

scholarly journals Monitoring the Interfacial Polymerization of Piperazine and Trimesoyl Chloride with Hydrophilic Interlayer or Macromolecular Additive by in-situ FT-IR Spectroscopy

2019 ◽  
Author(s):  
Xi Yang
Keyword(s):  
Ir Spectroscopy ◽  
Reaction Rate ◽  
Interfacial Polymerization ◽  
Reaction System ◽  
Reaction Rates ◽  
Water Permeation ◽  
Ft Ir ◽  
Trimesoyl Chloride ◽  
Ft Ir Spectroscopy

The interfacial polymerization (IP) of piperazine (PIP) and trimesoyl chloride (TMC) has been extensively utilized to synthesize the nanofiltration (NF) membrane. However, it is still a huge challenge to monitor the IP reaction, because of the fast reaction rate and the formed ultra-thin film. Herein, two effective strategies are applied to reduce the IP reaction rate: (1) the introduction of hydrophilic interlayers between the porous substrate and the formed polyamide layer; (2) the addition of macromolecular additives in the aqueous solution of PIP. As a result, in-situ FT-IR spectroscopy was firstly used to monitor the IP reaction of PIP/TMC reaction system, with hydrophilic interlayers or macromolecular additives. Moreover, we study the formed polyamide layer growth on the substrate, in a real-time manner. The in-situ FT-IR experimental results confirm that the IP reaction rates are effectively suppressed and the formed polyamide thickness reduces from 138±24 nm to 46±2 nm. Furthermore, the optimized NF membrane with excellent performance are consequently obtained, which include the boosted water permeation flux about 141~238 (L·m2·h/MPa) and superior salt rejection of Na2SO4 > 98.4%.

Ethylene polymerization on a SiH4-modified Phillips catalyst: detection of in situ produced α-olefins by operando FT-IR spectroscopy

2012 ◽  
Vol 14 (7) ◽  
pp. 2239 ◽  
Author(s):  
Caterina Barzan ◽  
Elena Groppo ◽  
Elsje Alessandra Quadrelli ◽  
Vincent Monteil ◽  
Silvia Bordiga
Keyword(s):  
Ir Spectroscopy ◽  
Ethylene Polymerization ◽  
Phillips Catalyst ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

The Hydrogen-Bonded 2-Pyridone Dimer Model System. 1. Combined NMR and FT-IR Spectroscopy Study

2010 ◽  
Vol 114 (29) ◽  
pp. 7749-7760 ◽  
Author(s):  
Łukasz Szyc ◽  
Jing Guo ◽  
Ming Yang ◽  
Jens Dreyer ◽  
Peter M. Tolstoy ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Model System ◽  
Spectroscopy Study ◽  
Dimer Model ◽  
Ft Ir ◽  
System 1 ◽  
Ft Ir Spectroscopy ◽  
Hydrogen Bonded
Sign in / Sign up

Export Citation Format

Share Document