FT-IR Spectroscopy, a Major Tool for the Analysis of Peroxide Vulcanization Processes in the Presence of Coagents. I. Mechanism of EPM Peroxide Vulcanization with Aromatic bis(Allyl)Esters as Coagents

1993 ◽  
Vol 66 (2) ◽  
pp. 196-212 ◽  
Author(s):  
H. G. Dikland ◽  
L. van der Does ◽  
A. Bantjes
Keyword(s):  
Ir Spectroscopy ◽  
Scanning Microscopy ◽  
Rubber Industry ◽  
Atomic Force ◽  
Equilibrium Swelling ◽  
Ft Ir ◽  
Ft Ir Spectroscopy ◽  
Allyl Esters

Abstract In this paper the results of investigations on the mechanism of EPM peroxide vulcanizations in the presence of various bis(allyl)esters of aromatic diacids—as coagents—are presented. These coagents are commonly used in the rubber industry to increase the crosslinking efficiency, however, until now the mechanism of this process remained unclear. In our studies it is demonstrated that when using FT-IR spectroscopy in combination with equilibrium swelling techniques and atomic force scanning microscopy, the role of the coagents can be elucidated.

scholarly journals Ultrafast time-resolved quantum cascade laser diagnostic for revealing the role of surface formate species in the photocatalytic oxidation of methanol

2020 ◽  
Vol 10 (16) ◽  
pp. 5618-5627 ◽  
Author(s):  
Josefine Schnee ◽  
Marco Daturi ◽  
Mohamad El-Roz
Keyword(s):  
Ir Spectroscopy ◽  
Photocatalytic Oxidation ◽  
Time Resolved ◽  
Quantum Cascade ◽  
Oxidation Of Methanol ◽  
Laser Diagnostic ◽  
Surface Formate ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

QCL-assisted operando FT-IR spectroscopy revealed the role of surface formate species in the photocatalytic oxidation of methanol over TiO2.

scholarly journals Microplastic Contamination in Protected Areas of the Gulf of Venice

2021 ◽  
Vol 232 (9) ◽  
Author(s):  
Michele Mistri ◽  
Marco Scoponi ◽  
Andrea A. Sfriso ◽  
Cristina Munari ◽  
Marta Curiotto ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Adriatic Sea ◽  
Low Density ◽  
Northern Adriatic Sea ◽  
Northern Adriatic ◽  
Sediment Samples ◽  
Ft Ir ◽  
Western Side ◽  
Ft Ir Spectroscopy

AbstractWe investigated the concentration and composition of plastics in 7 Special Areas of Conservation (SACs) from the Gulf of Venice (northern Adriatic Sea). A total of 42 sediment samples were analyzed from 21 sites from 2017 to 2018. All sites except one were found to be polluted by plastics, with density ranging between 2250 and 28.4 items kg−1. Microplastics ranged from 100 to 61.6% of the collected plastics. Fragments were more represented than filaments. The greatest plastic concentrations were generally recorded in western SACs. Identification through FT-IR spectroscopy evidenced the presence of 8 polymer types: in western SACS, the majority were low-density polymers (PE, PP, PS, and TPU), while in eastern SACs they were high-density polymers (PET, nylon, and PVC). In addition to the role of large rivers (all on the western side of the Gulf) in conveying plastics into the sea, a possible role of the cyclonic water circulation of the northern Adriatic Sea on distribution and composition of plastics along the Gulf coasts is likely.

Role of the nature of the acid sites in the oxydehydrogenation of propane on a VPO/TiO2 catalyst. An in situ FT-IR spectroscopy investigation

1996 ◽  
Vol 38 (3-4) ◽  
pp. 197-201 ◽  
Author(s):  
L. Savary ◽  
J. Saussey ◽  
G. Costentin ◽  
M. M. Bettahar ◽  
J. C. Lavalley ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Acid Sites ◽  
Tio2 Catalyst ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

scholarly journals Modification in surface properties of poly-allyl-diglycol-carbonate (CR-39) implanted by Au+ ions at different fluences

2016 ◽  
Vol 34 (2) ◽  
pp. 468-478 ◽  
Author(s):  
Riffat Sagheer ◽  
M. Shahid Rafique ◽  
Farhat Saleemi ◽  
Shafaq Arif ◽  
Fabian Naab ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Ir Spectroscopy ◽  
Ion Implantation ◽  
Surface Properties ◽  
Force Microscopy ◽  
Atomic Force ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Insulating Polymers ◽  
Ft Ir Spectroscopy

AbstractIon implantation has a potential to modify the surface properties and to produce thin conductive layers in insulating polymers. For this purpose, poly-allyl-diglycol-carbonate (CR-39) was implanted by 400 keV Au+ ions with ion fluences ranging from 5 × 1013 ions/cm2 to 5 × 1015 ions/cm2. The chemical, morphological and optical properties of implanted CR-39 were analyzed using Raman, Fourier transform infrared (FT-IR) spectroscopy, atomic force microscopy (AFM) and UV-Vis spectroscopy. The electrical conductivity of implanted samples was determined through four-point probe technique. Raman spectroscopy revealed the formation of carbonaceous structures in the implanted layer of CR-39. From FT-IR spectroscopy analysis, changes in functional groups of CR-39 after ion implantation were observed. AFM studies revealed that morphology and surface roughness of implanted samples depend on the fluence of Au ions. The optical band gap of implanted samples decreased from 3.15 eV (for pristine) to 1.05 eV (for sample implanted at 5 × 1015 ions/cm2). The electrical conductivity was observed to increase with the ion fluence. It is suggested that due to an increase in ion fluence, the carbonaceous structures formed in the implanted region are responsible for the increase in electrical conductivity.

The role of water in B-DNAs BI to BII conformer substates interconversion: a combined study by calorimetry, FT-IR spectroscopy and computer simulation

2000 ◽  
Vol 258 (2-3) ◽  
pp. 391-404 ◽  
Author(s):  
Arthur Pichler ◽  
Simon Rüdisser ◽  
Rudolf H. Winger ◽  
Klaus R. Liedl ◽  
Andreas Hallbrucker ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Ir Spectroscopy ◽  
Ft Ir ◽  
Ft Ir Spectroscopy
Sign in / Sign up

Export Citation Format

Share Document