Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

FTIR curing profile

The FTIR cure profiles of some I mixtures using the overlap and the acrylate bands (Figure 2) show a fast initial rate followed by a slow down with extended irradiation times. The change in cure regime takes place at... [Pg.442]

Cure Study I Mixtures - FTIR Profile. Overlap Band (left). Acrylate Band (right)... [Pg.443]

Figure 1. FTIR profile of the curing process for mixtures I (mono, O ), II (di, ), and III (tri, 0 ). Figure 1. FTIR profile of the curing process for mixtures I (mono, O ), II (di, ), and III (tri, 0 ).
The maximum value of Rp (between 10% and 30% conversion) is one of the reliable parameters to measure the reactivity of the formulation. FTIR profiles also provide the amount of unreacted functional groups remaining in the cured system, which is a parameter that strongly affects the final properties of the polymer. Real-time FTIR is also well suited for dark polymerization reactions that occur immediately after light exposure. One of the disadvantages of this technique appears in composite systems, in which the presence of additives may interfere with the transmission of the light by the polymer system, such as in dental composites. ... [Pg.421]

H-NMR analyses were performed on an IBM Instruments AF2S0 spectrometer and IR analyses were obtained fi om an IBM FTER Mcxlel 44. High temperature FTIR measurements were made in-situ on films whicdi were solution spun onto NaQ plates. The sample cell was coimnected to a temperature controller for isothermal and step-ramp temperature profiles. The relative amount of imidization was determined from the ratio of the 1776 cm imide peak area to the peak area of the final, fully cured film (350 °C, 30 minutes) at each isothermal temperature to remove the temperature effect on the peak area. [Pg.406]

The thermooxidative stability of NR was studied at 150C as a function of the cure process (sulphur, sulphurless or peroxide curing) and the properties of the carbon black filler (five different carbon blacks were used). The thermooxidation was followed by iodometric analysis of hydroperoxide levels, FTIR spectroscopy and differential thermal analysis. The results were discussed and they showed that the type of curing system had an effect on the degradation profile, but the surface reactivity and structure of the carbon black had a controlling role in each system. 13 refs. [Pg.83]


See other pages where FTIR curing profile is mentioned: [Pg.442]    [Pg.442]    [Pg.839]    [Pg.839]    [Pg.244]    [Pg.462]    [Pg.304]    [Pg.328]    [Pg.57]    [Pg.244]    [Pg.182]    [Pg.243]    [Pg.255]    [Pg.67]    [Pg.9]   
See also in sourсe #XX -- [ Pg.442 , Pg.443 ]




SEARCH



Cure profile

© 2024 chempedia.info