Salehiyan, RezaBandyopadhyay, JayitaRay, Suprakas S2019-07-292019-07-292019-05Salehiyan, R., Bandyopadhyay, J and Ray, S.S. 2019. Mechanism of thermal degradation-induced gel formation in polyamide 6/ethylene vinyl alcohol blend nanocomposites studied by time-resolved rheology and hyphenated thermogravimetric analyzer Fourier transform infrared spectroscopy mass spectroscopy: Synergistic role of nanoparticles and maleicanhydride-grafted polypropylene. ACS Omega, v(4), pp 9569-95822470-1343https://pubs.acs.org/doi/10.1021/acsomega.9b00940http://hdl.handle.net/10204/11049Copyright: 2019 ACS. This is the full text version of the article.In this study, polyamide 6 (PA) is blended with ethylene vinyl alcohol (EVOH) to yield packaging materials with a balance of mechanical and gas barrier properties. However, the formation of gel-like structures in both polymers because of thermal degradation at high temperatures leads to a processing challenge, particularly during thin-gauge film extrusion. To address this challenge, nanoclays are introduced either directly or via a masterbatch of maleicanhydride-grafted polypropylene to the PA/EVOH blend and timeresolved rheometry is used to study the effect of different modes of nanoclay incorporation on the kinetics of thermo-oxidative degradation of PA/EVOH blend and its nanocomposites. Time-resolved rheometry measurements allow the acquisition of accurate frequency-dependent linear viscoelastic behavior and offer insights into the rate of degradation or gel formation kinetics and cross-link density. The thermal degradation was studied by thermogravimetric analysis coupled with Fourier transform infrared spectroscopy and mass spectroscopy, allowing the prediction of the possible reactions that take place during the rheological property measurements. The results show that when nanoclays are incorporated directly, the oxidative reactions occur faster. In contrast, in the masterbatch method, oxidative degradation is hindered. The difference in the behaviors is shown to lie in the different nanoclay distributions in the blends; in the blends prepared by the masterbatch method, the nanoclays are dispersed at the interface. In conclusion, the masterbatch-containing blend nanocomposite would benefit processing and product development.enPolyamide 6PolymersThermogravimetric analysisArticleSalehiyan, R., Bandyopadhyay, J., & Ray, S. S. (2019). Mechanism of thermal degradation-induced gel formation in polyamide 6/ethylene vinyl alcohol blend nanocomposites studied by time-resolved rheology and hyphenated thermogravimetric analyzer Fourier transform infrared spectroscopy mass spectroscopy: Synergistic role of nanoparticles and maleicanhydride-grafted polypropylene. http://hdl.handle.net/10204/11049Salehiyan, Reza, Jayita Bandyopadhyay, and Suprakas S Ray "Mechanism of thermal degradation-induced gel formation in polyamide 6/ethylene vinyl alcohol blend nanocomposites studied by time-resolved rheology and hyphenated thermogravimetric analyzer Fourier transform infrared spectroscopy mass spectroscopy: Synergistic role of nanoparticles and maleicanhydride-grafted polypropylene." (2019) http://hdl.handle.net/10204/11049Salehiyan R, Bandyopadhyay J, Ray SS. Mechanism of thermal degradation-induced gel formation in polyamide 6/ethylene vinyl alcohol blend nanocomposites studied by time-resolved rheology and hyphenated thermogravimetric analyzer Fourier transform infrared spectroscopy mass spectroscopy: Synergistic role of nanoparticles and maleicanhydride-grafted polypropylene. 2019; http://hdl.handle.net/10204/11049.TY - Article AU - Salehiyan, Reza AU - Bandyopadhyay, Jayita AU - Ray, Suprakas S AB - In this study, polyamide 6 (PA) is blended with ethylene vinyl alcohol (EVOH) to yield packaging materials with a balance of mechanical and gas barrier properties. However, the formation of gel-like structures in both polymers because of thermal degradation at high temperatures leads to a processing challenge, particularly during thin-gauge film extrusion. To address this challenge, nanoclays are introduced either directly or via a masterbatch of maleicanhydride-grafted polypropylene to the PA/EVOH blend and timeresolved rheometry is used to study the effect of different modes of nanoclay incorporation on the kinetics of thermo-oxidative degradation of PA/EVOH blend and its nanocomposites. Time-resolved rheometry measurements allow the acquisition of accurate frequency-dependent linear viscoelastic behavior and offer insights into the rate of degradation or gel formation kinetics and cross-link density. The thermal degradation was studied by thermogravimetric analysis coupled with Fourier transform infrared spectroscopy and mass spectroscopy, allowing the prediction of the possible reactions that take place during the rheological property measurements. The results show that when nanoclays are incorporated directly, the oxidative reactions occur faster. In contrast, in the masterbatch method, oxidative degradation is hindered. The difference in the behaviors is shown to lie in the different nanoclay distributions in the blends; in the blends prepared by the masterbatch method, the nanoclays are dispersed at the interface. In conclusion, the masterbatch-containing blend nanocomposite would benefit processing and product development. DA - 2019-05 DB - ResearchSpace DP - CSIR KW - Polyamide 6 KW - Polymers KW - Thermogravimetric analysis LK - https://researchspace.csir.co.za PY - 2019 SM - 2470-1343 T1 - Mechanism of thermal degradation-induced gel formation in polyamide 6/ethylene vinyl alcohol blend nanocomposites studied by time-resolved rheology and hyphenated thermogravimetric analyzer Fourier transform infrared spectroscopy mass spectroscopy: Synergistic role of nanoparticles and maleicanhydride-grafted polypropylene TI - Mechanism of thermal degradation-induced gel formation in polyamide 6/ethylene vinyl alcohol blend nanocomposites studied by time-resolved rheology and hyphenated thermogravimetric analyzer Fourier transform infrared spectroscopy mass spectroscopy: Synergistic role of nanoparticles and maleicanhydride-grafted polypropylene UR - http://hdl.handle.net/10204/11049 ER -