Curing Behavior, Rheological, and Thermal Properties of DGEBA Modified with Synthesized BPA/PEG Hyperbranched Epoxy after Their Photo-Initiated Cationic Polymerization
This paper investigates the photo-initiated cationic polymerization of diglycidyl ether of bisphenol A (DGEBA) modified with bisphenol A (BPA)/polyethylene glycol (PEG) hyperbranched epoxy resin. The relationship between curing behavior, rheological, and thermal properties of the modified DGEBA is i...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-09-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/12/10/2240 |
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| author | Tossapol Boonlert-uthai Kentaro Taki Anongnat Somwangthanaroj |
| author_facet | Tossapol Boonlert-uthai Kentaro Taki Anongnat Somwangthanaroj |
| author_sort | Tossapol Boonlert-uthai |
| collection | DOAJ |
| description | This paper investigates the photo-initiated cationic polymerization of diglycidyl ether of bisphenol A (DGEBA) modified with bisphenol A (BPA)/polyethylene glycol (PEG) hyperbranched epoxy resin. The relationship between curing behavior, rheological, and thermal properties of the modified DGEBA is investigated using photo-differential scanning calorimetry (DSC) and photo-rheometer techniques. It is seen that the addition of the hyperbranched epoxy resin can increase UV conversion (α<sub>UV</sub>) and reduce gelation time (<i>t</i><sub>gel</sub>). After photo-initiation polymerization (dark reaction) occurred, a second exothermic peak in the DSC thermogram takes place: namely, the occurrence of curing reaction owing to the activated monomer (AM) mechanism. Consequently, the glass transition temperature decreased, and at the same time, UV intensity increased which was due to the molecular weight between crosslinking points (<i>M</i><sub>c</sub>). Furthermore, the radius of gyration (<i>R</i><sub>g</sub>) of the network segment is determined via small-angle X-ray scattering (SAXS). It is noted that the higher the <i>M</i><sub>c</sub>, the larger the radius of gyration proves to be, resulting in low glass transition temperature. |
| first_indexed | 2024-03-10T15:58:37Z |
| format | Article |
| id | doaj.art-35214c1107e148b78ce98b18624fa0a4 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T15:58:37Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-35214c1107e148b78ce98b18624fa0a42023-11-20T15:27:40ZengMDPI AGPolymers2073-43602020-09-011210224010.3390/polym12102240Curing Behavior, Rheological, and Thermal Properties of DGEBA Modified with Synthesized BPA/PEG Hyperbranched Epoxy after Their Photo-Initiated Cationic PolymerizationTossapol Boonlert-uthai0Kentaro Taki1Anongnat Somwangthanaroj2Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, ThailandSchool of Mechanical Engineering, Kanazawa University, Kanazawa 920-1192, JapanDepartment of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, ThailandThis paper investigates the photo-initiated cationic polymerization of diglycidyl ether of bisphenol A (DGEBA) modified with bisphenol A (BPA)/polyethylene glycol (PEG) hyperbranched epoxy resin. The relationship between curing behavior, rheological, and thermal properties of the modified DGEBA is investigated using photo-differential scanning calorimetry (DSC) and photo-rheometer techniques. It is seen that the addition of the hyperbranched epoxy resin can increase UV conversion (α<sub>UV</sub>) and reduce gelation time (<i>t</i><sub>gel</sub>). After photo-initiation polymerization (dark reaction) occurred, a second exothermic peak in the DSC thermogram takes place: namely, the occurrence of curing reaction owing to the activated monomer (AM) mechanism. Consequently, the glass transition temperature decreased, and at the same time, UV intensity increased which was due to the molecular weight between crosslinking points (<i>M</i><sub>c</sub>). Furthermore, the radius of gyration (<i>R</i><sub>g</sub>) of the network segment is determined via small-angle X-ray scattering (SAXS). It is noted that the higher the <i>M</i><sub>c</sub>, the larger the radius of gyration proves to be, resulting in low glass transition temperature.https://www.mdpi.com/2073-4360/12/10/2240hyperbranched epoxyphoto-polymerizationrheological propertythermal property |
| spellingShingle | Tossapol Boonlert-uthai Kentaro Taki Anongnat Somwangthanaroj Curing Behavior, Rheological, and Thermal Properties of DGEBA Modified with Synthesized BPA/PEG Hyperbranched Epoxy after Their Photo-Initiated Cationic Polymerization Polymers hyperbranched epoxy photo-polymerization rheological property thermal property |
| title | Curing Behavior, Rheological, and Thermal Properties of DGEBA Modified with Synthesized BPA/PEG Hyperbranched Epoxy after Their Photo-Initiated Cationic Polymerization |
| title_full | Curing Behavior, Rheological, and Thermal Properties of DGEBA Modified with Synthesized BPA/PEG Hyperbranched Epoxy after Their Photo-Initiated Cationic Polymerization |
| title_fullStr | Curing Behavior, Rheological, and Thermal Properties of DGEBA Modified with Synthesized BPA/PEG Hyperbranched Epoxy after Their Photo-Initiated Cationic Polymerization |
| title_full_unstemmed | Curing Behavior, Rheological, and Thermal Properties of DGEBA Modified with Synthesized BPA/PEG Hyperbranched Epoxy after Their Photo-Initiated Cationic Polymerization |
| title_short | Curing Behavior, Rheological, and Thermal Properties of DGEBA Modified with Synthesized BPA/PEG Hyperbranched Epoxy after Their Photo-Initiated Cationic Polymerization |
| title_sort | curing behavior rheological and thermal properties of dgeba modified with synthesized bpa peg hyperbranched epoxy after their photo initiated cationic polymerization |
| topic | hyperbranched epoxy photo-polymerization rheological property thermal property |
| url | https://www.mdpi.com/2073-4360/12/10/2240 |
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