Influence of Ultraviolet Radiation on Mechanical Properties of a Photoinitiator Compounded High Vinyl Styrene–Butadiene–Styrene Block Copolymer
Ultraviolet curing of elastomers is a special curing technique that has gained importance over the conventional chemical crosslinking method, because the former process is faster, and thus, time-saving. Usually, a suitable photoinitiator is required to initiate the process. Ultraviolet radiation of...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-04-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/13/8/1287 |
| _version_ | 1797537668636082176 |
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| author | Sanjoy Datta Radek Stocek Kinsuk Naskar |
| author_facet | Sanjoy Datta Radek Stocek Kinsuk Naskar |
| author_sort | Sanjoy Datta |
| collection | DOAJ |
| description | Ultraviolet curing of elastomers is a special curing technique that has gained importance over the conventional chemical crosslinking method, because the former process is faster, and thus, time-saving. Usually, a suitable photoinitiator is required to initiate the process. Ultraviolet radiation of required frequency and intensity excites the photoinitiator which abstracts labile hydrogen atoms from the polymer with the generation of free radicals. These radicals result in crosslinking of elastomers via radical–radical coupling. In the process, some photodegradation may also take place. In the present work, a high vinyl (~50%) styrene–butadiene–styrene (SBS) block copolymer which is a thermoplastic elastomer was used as the base polymer. An attempt was made to see the effect of ultraviolet radiation on the mechanical properties of the block copolymer. The process variables were time of exposure and photoinitiator concentration. Mechanical properties like tensile strength, elongation at break, modulus at different elongations and hardness of the irradiated samples were studied and compared with those of unirradiated ones. In this S-B-S block copolymer, a relatively low exposure time and low photoinitiator concentration were effective in obtaining optimized mechanical properties. Infrared spectroscopy, contact angle and scanning electron microscopy were used to characterize the results obtained from mechanical measurements. |
| first_indexed | 2024-03-10T12:19:01Z |
| format | Article |
| id | doaj.art-a1b8b7d1738749029bb10072f641552f |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T12:19:01Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-a1b8b7d1738749029bb10072f641552f2023-11-21T15:39:17ZengMDPI AGPolymers2073-43602021-04-01138128710.3390/polym13081287Influence of Ultraviolet Radiation on Mechanical Properties of a Photoinitiator Compounded High Vinyl Styrene–Butadiene–Styrene Block CopolymerSanjoy Datta0Radek Stocek1Kinsuk Naskar2Centre of Polymer Systems, Tomas Bata University in Zlín, tr. Tomase Bati 5678, 760 01 Zlin, Czech RepublicCentre of Polymer Systems, Tomas Bata University in Zlín, tr. Tomase Bati 5678, 760 01 Zlin, Czech RepublicIndian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, IndiaUltraviolet curing of elastomers is a special curing technique that has gained importance over the conventional chemical crosslinking method, because the former process is faster, and thus, time-saving. Usually, a suitable photoinitiator is required to initiate the process. Ultraviolet radiation of required frequency and intensity excites the photoinitiator which abstracts labile hydrogen atoms from the polymer with the generation of free radicals. These radicals result in crosslinking of elastomers via radical–radical coupling. In the process, some photodegradation may also take place. In the present work, a high vinyl (~50%) styrene–butadiene–styrene (SBS) block copolymer which is a thermoplastic elastomer was used as the base polymer. An attempt was made to see the effect of ultraviolet radiation on the mechanical properties of the block copolymer. The process variables were time of exposure and photoinitiator concentration. Mechanical properties like tensile strength, elongation at break, modulus at different elongations and hardness of the irradiated samples were studied and compared with those of unirradiated ones. In this S-B-S block copolymer, a relatively low exposure time and low photoinitiator concentration were effective in obtaining optimized mechanical properties. Infrared spectroscopy, contact angle and scanning electron microscopy were used to characterize the results obtained from mechanical measurements.https://www.mdpi.com/2073-4360/13/8/1287ultraviolet radiationthermoplastic elastomerhigh vinyl S-B-Sphotoinitiatormechanical properties |
| spellingShingle | Sanjoy Datta Radek Stocek Kinsuk Naskar Influence of Ultraviolet Radiation on Mechanical Properties of a Photoinitiator Compounded High Vinyl Styrene–Butadiene–Styrene Block Copolymer Polymers ultraviolet radiation thermoplastic elastomer high vinyl S-B-S photoinitiator mechanical properties |
| title | Influence of Ultraviolet Radiation on Mechanical Properties of a Photoinitiator Compounded High Vinyl Styrene–Butadiene–Styrene Block Copolymer |
| title_full | Influence of Ultraviolet Radiation on Mechanical Properties of a Photoinitiator Compounded High Vinyl Styrene–Butadiene–Styrene Block Copolymer |
| title_fullStr | Influence of Ultraviolet Radiation on Mechanical Properties of a Photoinitiator Compounded High Vinyl Styrene–Butadiene–Styrene Block Copolymer |
| title_full_unstemmed | Influence of Ultraviolet Radiation on Mechanical Properties of a Photoinitiator Compounded High Vinyl Styrene–Butadiene–Styrene Block Copolymer |
| title_short | Influence of Ultraviolet Radiation on Mechanical Properties of a Photoinitiator Compounded High Vinyl Styrene–Butadiene–Styrene Block Copolymer |
| title_sort | influence of ultraviolet radiation on mechanical properties of a photoinitiator compounded high vinyl styrene butadiene styrene block copolymer |
| topic | ultraviolet radiation thermoplastic elastomer high vinyl S-B-S photoinitiator mechanical properties |
| url | https://www.mdpi.com/2073-4360/13/8/1287 |
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