Photooxidative Behavior of Polystyrene Nanocomposites Filled with Two-Dimensional Molybdenum Disulfide

This study aimed to investigate how an ultralow content of a molybdenum disulfide (MoS ) two-dimensional particle affects the photodegradation mechanism of polystyrene (PS). Here, an accelerated weathering study was presented on neat polystyrene and its nanocomposites produced with 0.001, 0.002, 0.0...

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Published in:	Polymers Vol. 15; no. 9; p. 2099
Main Authors:	Angulo, Aurianny Lima, Rodriguez, Camila Laura Celis, Fechine, Guilhermino José Macedo
Format:	Journal Article
Language:	English
Published:	Switzerland MDPI AG 28-04-2023 MDPI
Subjects:	Fourier transforms Free radicals Infrared spectroscopy Molybdenum Molybdenum compounds Molybdenum disulfide Nanocomposites Oxidation Photodegradation Polymers Polystyrene resins Size exclusion chromatography Spectrum analysis Ultraviolet radiation UV stabilizers two-dimensional filler molybdenum disulfide photodegradation nanocomposites polystyrene
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Abstract	This study aimed to investigate how an ultralow content of a molybdenum disulfide (MoS ) two-dimensional particle affects the photodegradation mechanism of polystyrene (PS). Here, an accelerated weathering study was presented on neat polystyrene and its nanocomposites produced with 0.001, 0.002, 0.003 and 0.005 wt% of molybdenum disulfide (MoS ) exposed for various irradiation intervals (up to 8 weeks). The polymer photo-transformations were monitored using size exclusion chromatography (SEC), infrared spectroscopy (FTIR), and UV-Vis spectroscopy. The FTIR and UV/Vis results indicate that the PS degradation mechanism was not altered by the presence of MoS particles; however, the degradation reactions were slowed down at higher MoS contents (>0.003%). The SEC results proved the stabilizer effect due to MoS particles, where M¯n, M¯w, and M¯w/M¯n values after 8 weeks were less modified when compared with the neat PS results. The MoS acted as a UV stabilizer, and these two-dimensional particles acted by deactivating the free radicals generated by the PS matrix, even considering the low amount of the filler (<0.005 wt%).
AbstractList	This study aimed to investigate how an ultralow content of a molybdenum disulfide (MoS[sub.2]) two-dimensional particle affects the photodegradation mechanism of polystyrene (PS). Here, an accelerated weathering study was presented on neat polystyrene and its nanocomposites produced with 0.001, 0.002, 0.003 and 0.005 wt% of molybdenum disulfide (MoS[sub.2]) exposed for various irradiation intervals (up to 8 weeks). The polymer photo-transformations were monitored using size exclusion chromatography (SEC), infrared spectroscopy (FTIR), and UV-Vis spectroscopy. The FTIR and UV/Vis results indicate that the PS degradation mechanism was not altered by the presence of MoS[sub.2] particles; however, the degradation reactions were slowed down at higher MoS[sub.2] contents (>0.003%). The SEC results proved the stabilizer effect due to MoS[sub.2] particles, where M¯[sub.n], M¯[sub.w], and M¯[sub.w]/M¯[sub.n] values after 8 weeks were less modified when compared with the neat PS results. The MoS[sub.2] acted as a UV stabilizer, and these two-dimensional particles acted by deactivating the free radicals generated by the PS matrix, even considering the low amount of the filler (<0.005 wt%). This study aimed to investigate how an ultralow content of a molybdenum disulfide (MoS ) two-dimensional particle affects the photodegradation mechanism of polystyrene (PS). Here, an accelerated weathering study was presented on neat polystyrene and its nanocomposites produced with 0.001, 0.002, 0.003 and 0.005 wt% of molybdenum disulfide (MoS ) exposed for various irradiation intervals (up to 8 weeks). The polymer photo-transformations were monitored using size exclusion chromatography (SEC), infrared spectroscopy (FTIR), and UV-Vis spectroscopy. The FTIR and UV/Vis results indicate that the PS degradation mechanism was not altered by the presence of MoS particles; however, the degradation reactions were slowed down at higher MoS contents (>0.003%). The SEC results proved the stabilizer effect due to MoS particles, where M¯n, M¯w, and M¯w/M¯n values after 8 weeks were less modified when compared with the neat PS results. The MoS acted as a UV stabilizer, and these two-dimensional particles acted by deactivating the free radicals generated by the PS matrix, even considering the low amount of the filler (<0.005 wt%). This study aimed to investigate how an ultralow content of a molybdenum disulfide (MoS 2 ) two-dimensional particle affects the photodegradation mechanism of polystyrene (PS). Here, an accelerated weathering study was presented on neat polystyrene and its nanocomposites produced with 0.001, 0.002, 0.003 and 0.005 wt% of molybdenum disulfide (MoS 2 ) exposed for various irradiation intervals (up to 8 weeks). The polymer photo-transformations were monitored using size exclusion chromatography (SEC), infrared spectroscopy (FTIR), and UV-Vis spectroscopy. The FTIR and UV/Vis results indicate that the PS degradation mechanism was not altered by the presence of MoS 2 particles; however, the degradation reactions were slowed down at higher MoS 2 contents (>0.003%). The SEC results proved the stabilizer effect due to MoS 2 particles, where M ¯ n , M ¯ w , and M ¯ w / M ¯ n values after 8 weeks were less modified when compared with the neat PS results. The MoS 2 acted as a UV stabilizer, and these two-dimensional particles acted by deactivating the free radicals generated by the PS matrix, even considering the low amount of the filler (<0.005 wt%). This study aimed to investigate how an ultralow content of a molybdenum disulfide (MoS2) two-dimensional particle affects the photodegradation mechanism of polystyrene (PS). Here, an accelerated weathering study was presented on neat polystyrene and its nanocomposites produced with 0.001, 0.002, 0.003 and 0.005 wt% of molybdenum disulfide (MoS2) exposed for various irradiation intervals (up to 8 weeks). The polymer photo-transformations were monitored using size exclusion chromatography (SEC), infrared spectroscopy (FTIR), and UV-Vis spectroscopy. The FTIR and UV/Vis results indicate that the PS degradation mechanism was not altered by the presence of MoS2 particles; however, the degradation reactions were slowed down at higher MoS2 contents (>0.003%). The SEC results proved the stabilizer effect due to MoS2 particles, where M¯n, M¯w, and M¯w/M¯n values after 8 weeks were less modified when compared with the neat PS results. The MoS2 acted as a UV stabilizer, and these two-dimensional particles acted by deactivating the free radicals generated by the PS matrix, even considering the low amount of the filler (<0.005 wt%).
Audience	Academic
Author	Angulo, Aurianny Lima Fechine, Guilhermino José Macedo Rodriguez, Camila Laura Celis
AuthorAffiliation	2 MackGraphe—Mackenzie Institute for Research in Graphene and Nanotechnologies, Mackenzie Presbyterian Institute, Rua da Consolação, 930—Consolação, São Paulo 01302-907, Brazil 1 School of Engineering, Mackenzie Presbyterian University, Rua da Consolação, 930—Consolação, São Paulo 01302-907, Brazil; annyauri@gmail.com (A.L.A.); celis.camilalaura@gmail.com (C.L.C.R.)
AuthorAffiliation_xml	– name: 1 School of Engineering, Mackenzie Presbyterian University, Rua da Consolação, 930—Consolação, São Paulo 01302-907, Brazil; annyauri@gmail.com (A.L.A.); celis.camilalaura@gmail.com (C.L.C.R.) – name: 2 MackGraphe—Mackenzie Institute for Research in Graphene and Nanotechnologies, Mackenzie Presbyterian Institute, Rua da Consolação, 930—Consolação, São Paulo 01302-907, Brazil
Author_xml	– sequence: 1 givenname: Aurianny Lima surname: Angulo fullname: Angulo, Aurianny Lima organization: MackGraphe-Mackenzie Institute for Research in Graphene and Nanotechnologies, Mackenzie Presbyterian Institute, Rua da Consolação, 930-Consolação, São Paulo 01302-907, Brazil – sequence: 2 givenname: Camila Laura Celis surname: Rodriguez fullname: Rodriguez, Camila Laura Celis organization: MackGraphe-Mackenzie Institute for Research in Graphene and Nanotechnologies, Mackenzie Presbyterian Institute, Rua da Consolação, 930-Consolação, São Paulo 01302-907, Brazil – sequence: 3 givenname: Guilhermino José Macedo orcidid: 0000-0002-5520-8488 surname: Fechine fullname: Fechine, Guilhermino José Macedo organization: MackGraphe-Mackenzie Institute for Research in Graphene and Nanotechnologies, Mackenzie Presbyterian Institute, Rua da Consolação, 930-Consolação, São Paulo 01302-907, Brazil
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Keywords	two-dimensional filler molybdenum disulfide photodegradation nanocomposites polystyrene
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Snippet	This study aimed to investigate how an ultralow content of a molybdenum disulfide (MoS ) two-dimensional particle affects the photodegradation mechanism of... This study aimed to investigate how an ultralow content of a molybdenum disulfide (MoS2) two-dimensional particle affects the photodegradation mechanism of... This study aimed to investigate how an ultralow content of a molybdenum disulfide (MoS[sub.2]) two-dimensional particle affects the photodegradation mechanism... This study aimed to investigate how an ultralow content of a molybdenum disulfide (MoS 2 ) two-dimensional particle affects the photodegradation mechanism of...
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StartPage	2099
SubjectTerms	Fourier transforms Free radicals Infrared spectroscopy Molybdenum Molybdenum compounds Molybdenum disulfide Nanocomposites Oxidation Photodegradation Polymers Polystyrene resins Size exclusion chromatography Spectrum analysis Ultraviolet radiation UV stabilizers
Title	Photooxidative Behavior of Polystyrene Nanocomposites Filled with Two-Dimensional Molybdenum Disulfide
URI	https://www.ncbi.nlm.nih.gov/pubmed/37177245 https://www.proquest.com/docview/2812740051 https://search.proquest.com/docview/2813558633 https://pubmed.ncbi.nlm.nih.gov/PMC10180763
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