Roles of Small Polyetherimide Moieties on Thermal Stability and Fracture Toughness of Epoxy Blends
Bisphenol A diglycidyl ether (DGEBA) was blended with polyetherimide (PEI) as a thermoplastic toughener for thermal stability and mechanical properties as a function of PEI contents. The thermal stability and mechanical properties were investigated using a thermogravimetric analyzer (TGA) and a univ...
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| Format: | Article |
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MDPI AG
2021-09-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/13/19/3310 |
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| author | Seul-Yi Lee Min-Joo Kang Seong-Hwang Kim Kyong Yop Rhee Jong-Hoon Lee Soo-Jin Park |
| author_facet | Seul-Yi Lee Min-Joo Kang Seong-Hwang Kim Kyong Yop Rhee Jong-Hoon Lee Soo-Jin Park |
| author_sort | Seul-Yi Lee |
| collection | DOAJ |
| description | Bisphenol A diglycidyl ether (DGEBA) was blended with polyetherimide (PEI) as a thermoplastic toughener for thermal stability and mechanical properties as a function of PEI contents. The thermal stability and mechanical properties were investigated using a thermogravimetric analyzer (TGA) and a universal test machine, respectively. The TGA results indicate that PEI addition enhanced the thermal stability of the epoxy resins in terms of the integral procedural decomposition temperature (IPDT) and pyrolysis activation energy (<i>E</i><sub>t</sub>). The IPDT and <i>E</i><sub>t</sub> values of the DGEBA/PEI blends containing 2 wt% of PEI increased by 2% and 22%, respectively, compared to those of neat DGEBA. Moreover, the critical stress intensity factor and critical strain energy release rate for the DGEBA/PEI blends containing 2 wt% of PEI increased by 83% and 194%, respectively, compared to those of neat DGEBA. These results demonstrate that PEI plays a key role in enhancing the flexural strength and fracture toughness of epoxy blends. This can be attributed to the newly formed semi-interpenetrating polymer networks (semi-IPNs) composed of the epoxy network and linear PEI. |
| first_indexed | 2024-03-10T06:53:22Z |
| format | Article |
| id | doaj.art-bf2d750b18c74892a74a717125da058a |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T06:53:22Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-bf2d750b18c74892a74a717125da058a2023-11-22T16:38:46ZengMDPI AGPolymers2073-43602021-09-011319331010.3390/polym13193310Roles of Small Polyetherimide Moieties on Thermal Stability and Fracture Toughness of Epoxy BlendsSeul-Yi Lee0Min-Joo Kang1Seong-Hwang Kim2Kyong Yop Rhee3Jong-Hoon Lee4Soo-Jin Park5Department of Chemistry, Inha University, 100 Inharo, Incheon 22212, KoreaDepartment of Chemistry, Inha University, 100 Inharo, Incheon 22212, KoreaDepartment of Chemistry, Inha University, 100 Inharo, Incheon 22212, KoreaDepartment of Mechanical Engineering, College of Engineering, Kyung Hee University, 1732 Deogyeong-daero, Yongin 17104, KoreaDepartment of Chemistry, Inha University, 100 Inharo, Incheon 22212, KoreaDepartment of Chemistry, Inha University, 100 Inharo, Incheon 22212, KoreaBisphenol A diglycidyl ether (DGEBA) was blended with polyetherimide (PEI) as a thermoplastic toughener for thermal stability and mechanical properties as a function of PEI contents. The thermal stability and mechanical properties were investigated using a thermogravimetric analyzer (TGA) and a universal test machine, respectively. The TGA results indicate that PEI addition enhanced the thermal stability of the epoxy resins in terms of the integral procedural decomposition temperature (IPDT) and pyrolysis activation energy (<i>E</i><sub>t</sub>). The IPDT and <i>E</i><sub>t</sub> values of the DGEBA/PEI blends containing 2 wt% of PEI increased by 2% and 22%, respectively, compared to those of neat DGEBA. Moreover, the critical stress intensity factor and critical strain energy release rate for the DGEBA/PEI blends containing 2 wt% of PEI increased by 83% and 194%, respectively, compared to those of neat DGEBA. These results demonstrate that PEI plays a key role in enhancing the flexural strength and fracture toughness of epoxy blends. This can be attributed to the newly formed semi-interpenetrating polymer networks (semi-IPNs) composed of the epoxy network and linear PEI.https://www.mdpi.com/2073-4360/13/19/3310epoxy resinspolyetherimidethermal stabilityfracture toughness |
| spellingShingle | Seul-Yi Lee Min-Joo Kang Seong-Hwang Kim Kyong Yop Rhee Jong-Hoon Lee Soo-Jin Park Roles of Small Polyetherimide Moieties on Thermal Stability and Fracture Toughness of Epoxy Blends Polymers epoxy resins polyetherimide thermal stability fracture toughness |
| title | Roles of Small Polyetherimide Moieties on Thermal Stability and Fracture Toughness of Epoxy Blends |
| title_full | Roles of Small Polyetherimide Moieties on Thermal Stability and Fracture Toughness of Epoxy Blends |
| title_fullStr | Roles of Small Polyetherimide Moieties on Thermal Stability and Fracture Toughness of Epoxy Blends |
| title_full_unstemmed | Roles of Small Polyetherimide Moieties on Thermal Stability and Fracture Toughness of Epoxy Blends |
| title_short | Roles of Small Polyetherimide Moieties on Thermal Stability and Fracture Toughness of Epoxy Blends |
| title_sort | roles of small polyetherimide moieties on thermal stability and fracture toughness of epoxy blends |
| topic | epoxy resins polyetherimide thermal stability fracture toughness |
| url | https://www.mdpi.com/2073-4360/13/19/3310 |
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