Aromatic Hyperbranched Polyester/RTM6 Epoxy Resin for EXTREME Dynamic Loading Aeronautical Applications
The effects of the addition of an aromatic hyperbranched polyester (AHBP) on thermal, mechanical, and fracture toughness properties of a thermosetting resin system were investigated. AHBP filler, synthesized by using a bulk poly-condensation reaction, reveals a glassy state at room temperature. Inde...
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| Format: | Article |
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MDPI AG
2020-01-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/2/188 |
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| author | Aldobenedetto Zotti Ahmed Elmahdy Simona Zuppolini Anna Borriello Patricia Verleysen Mauro Zarrelli |
| author_facet | Aldobenedetto Zotti Ahmed Elmahdy Simona Zuppolini Anna Borriello Patricia Verleysen Mauro Zarrelli |
| author_sort | Aldobenedetto Zotti |
| collection | DOAJ |
| description | The effects of the addition of an aromatic hyperbranched polyester (AHBP) on thermal, mechanical, and fracture toughness properties of a thermosetting resin system were investigated. AHBP filler, synthesized by using a bulk poly-condensation reaction, reveals a glassy state at room temperature. Indeed, according to differential scanning calorimetry measurements, the glass transition temperature (T<sub>g</sub>) of AHBP is 95 °C. Three different adduct weight percentages were employed to manufacture the AHBP/epoxy samples, respectively, 0.1, 1, and 5 wt%. Dynamical Mechanical Analysis tests revealed that the addition of AHBP induces a negligible variation in terms of conservative modulus, whereas a slight T<sub>g</sub> reduction of about 4 °C was observed at 5 wt% of filler content. Fracture toughness results showed an improvement of both critical stress intensity factor (+18%) and critical strain energy release rate (+83%) by adding 5 wt% of AHBP compared to the neat epoxy matrix. Static and dynamic compression tests covering strain rates ranging from 0.0008 to 1000 s<sup>−1</sup> revealed a pronounced strain rate sensitivity for all AHBP/epoxy systems. The AHBP composites all showed an increase of the true peak yield compressive strength with the best improvement associated with the sample with 0.1 wt% of AHBP. |
| first_indexed | 2024-04-13T04:16:14Z |
| format | Article |
| id | doaj.art-1f8227e6cb3045b492c9dda2c783b44d |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-04-13T04:16:14Z |
| publishDate | 2020-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-1f8227e6cb3045b492c9dda2c783b44d2022-12-22T03:02:57ZengMDPI AGNanomaterials2079-49912020-01-0110218810.3390/nano10020188nano10020188Aromatic Hyperbranched Polyester/RTM6 Epoxy Resin for EXTREME Dynamic Loading Aeronautical ApplicationsAldobenedetto Zotti0Ahmed Elmahdy1Simona Zuppolini2Anna Borriello3Patricia Verleysen4Mauro Zarrelli5Institute for Polymers, Composites and Biomaterials, National Research Council of Italy, P.le Fermi, 1, 80055 Portici, ItalyDepartment of Electromechanical, Systems & Metal Engineering, MST-DyMaLab, Ghent University, Technologiepark 46, B-9052 Zwijnaarde, BelgiumInstitute for Polymers, Composites and Biomaterials, National Research Council of Italy, P.le Fermi, 1, 80055 Portici, ItalyInstitute for Polymers, Composites and Biomaterials, National Research Council of Italy, P.le Fermi, 1, 80055 Portici, ItalyDepartment of Electromechanical, Systems & Metal Engineering, MST-DyMaLab, Ghent University, Technologiepark 46, B-9052 Zwijnaarde, BelgiumInstitute for Polymers, Composites and Biomaterials, National Research Council of Italy, P.le Fermi, 1, 80055 Portici, ItalyThe effects of the addition of an aromatic hyperbranched polyester (AHBP) on thermal, mechanical, and fracture toughness properties of a thermosetting resin system were investigated. AHBP filler, synthesized by using a bulk poly-condensation reaction, reveals a glassy state at room temperature. Indeed, according to differential scanning calorimetry measurements, the glass transition temperature (T<sub>g</sub>) of AHBP is 95 °C. Three different adduct weight percentages were employed to manufacture the AHBP/epoxy samples, respectively, 0.1, 1, and 5 wt%. Dynamical Mechanical Analysis tests revealed that the addition of AHBP induces a negligible variation in terms of conservative modulus, whereas a slight T<sub>g</sub> reduction of about 4 °C was observed at 5 wt% of filler content. Fracture toughness results showed an improvement of both critical stress intensity factor (+18%) and critical strain energy release rate (+83%) by adding 5 wt% of AHBP compared to the neat epoxy matrix. Static and dynamic compression tests covering strain rates ranging from 0.0008 to 1000 s<sup>−1</sup> revealed a pronounced strain rate sensitivity for all AHBP/epoxy systems. The AHBP composites all showed an increase of the true peak yield compressive strength with the best improvement associated with the sample with 0.1 wt% of AHBP.https://www.mdpi.com/2079-4991/10/2/188thermosetting resinpolymer-matrix composites (pmcs)fracture toughnesshigh-strain rate mechanical propertieshyperbranched polymers (hbps) |
| spellingShingle | Aldobenedetto Zotti Ahmed Elmahdy Simona Zuppolini Anna Borriello Patricia Verleysen Mauro Zarrelli Aromatic Hyperbranched Polyester/RTM6 Epoxy Resin for EXTREME Dynamic Loading Aeronautical Applications Nanomaterials thermosetting resin polymer-matrix composites (pmcs) fracture toughness high-strain rate mechanical properties hyperbranched polymers (hbps) |
| title | Aromatic Hyperbranched Polyester/RTM6 Epoxy Resin for EXTREME Dynamic Loading Aeronautical Applications |
| title_full | Aromatic Hyperbranched Polyester/RTM6 Epoxy Resin for EXTREME Dynamic Loading Aeronautical Applications |
| title_fullStr | Aromatic Hyperbranched Polyester/RTM6 Epoxy Resin for EXTREME Dynamic Loading Aeronautical Applications |
| title_full_unstemmed | Aromatic Hyperbranched Polyester/RTM6 Epoxy Resin for EXTREME Dynamic Loading Aeronautical Applications |
| title_short | Aromatic Hyperbranched Polyester/RTM6 Epoxy Resin for EXTREME Dynamic Loading Aeronautical Applications |
| title_sort | aromatic hyperbranched polyester rtm6 epoxy resin for extreme dynamic loading aeronautical applications |
| topic | thermosetting resin polymer-matrix composites (pmcs) fracture toughness high-strain rate mechanical properties hyperbranched polymers (hbps) |
| url | https://www.mdpi.com/2079-4991/10/2/188 |
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