Abstract
Thermogravimetric analysis coupled to Fourier transform infrared spectroscopy (TG/FT-IR) is a very popular technique for rubbers characterization. It involves analyses of the base polymer and additives. Ethylene–propylene–diene (EPDM) rubbers are frequently investigated by TG/FT-IR; however, the focus has been the degradation temperature range of the polymer. In this study, unvulcanized and vulcanized EPDM rubber and its additives were investigated by TG/FT-IR, without solvent extraction, and in a wide temperature range. Initially, the additives were individually characterized. TG/FT-IR identified the characteristic groups of all the additives analyzed and distinguished them from each other. Afterwards, unvulcanized and vulcanized EPDM rubbers were investigated without prior extraction.TG/FT-IR detected absorptions due to the additives tetramethylthiuram monosulfide and 2-mercaptobenzothiazole. Both of these sulfur-containing additives were present in the EPDM formulation at concentrations of 0.7 phr (0.63 wt %). The TG/FT-IR technique had some limitations, because not all the additives in EPDM rubber were detected. Paraffin oil, stearic acid and 2,2,4-trimethyl-1,2-dihydroquinoline functional groups were not observed in either the unvulcanized or vulcanized EPDM. Nevertheless, in addition to the ability of this method to detect sulfur-containing groups, the lack of a pre-extraction reduces the time and effort required for additive analysis in rubbers.
Highlights
Additives are selected and incorporated into rubbers TG/FT-IR to evaluate the effect of polyphenylsilsesquioxane to provide specific properties
Some chemicals The results indicated that PPSQ affects volatile products provide processing aid, extended shelf-life or improved of Ethylene–propylene–diene copolymer (EPDM) and is detected in its formulation by TG/FT-IR
A comparison between the degradation ranges of EPDM and its additives is useful because it indicates the temperature at which the characteristic absorptions of the additives should be searched for in the unvulcanized and vulcanized EPDM TG/FT-IR experiments
Summary
Additives are selected and incorporated into rubbers TG/FT-IR to evaluate the effect of polyphenylsilsesquioxane to provide specific properties. Useful rubbers can only be (PPSQ) on the release of volatile products in EPDM samples. Some chemicals The results indicated that PPSQ affects volatile products provide processing aid, extended shelf-life or improved of EPDM and is detected in its formulation by TG/FT-IR. Çavdar et al.[7] studied different vulcanizing agent contents As a result, rubbers are complex chemical materials, which by TG/FT-IR. They observed that increasing vulcanizing are difficult to analyze[1]. Analytical techniques that enable the agent content decreased band intensities of CO and CO2 detection of additives are of great importance for industries, and enhanced the thermal stability of EPDM rubber
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
