Long Chopped Glass Fiber Reinforced Low-Density Unsaturated Polyester Resin under Different Initiation
Long chopped glass fiber reinforced low-density unsaturated polyester resin (LCGFR-LDUPR) composite materials with light weight and excellent mechanical properties were prepared. It was proved that long chopped glass fiber, which was in length of 15.0 mm and chopped from ER4800-T718 plied yarn, was...
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| Language: | English |
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MDPI AG
2021-11-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/23/7307 |
| _version_ | 1797507535351054336 |
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| author | Xinjun Fu Xiaojun Wang Jinjian Zhu Minzhuang Chen |
| author_facet | Xinjun Fu Xiaojun Wang Jinjian Zhu Minzhuang Chen |
| author_sort | Xinjun Fu |
| collection | DOAJ |
| description | Long chopped glass fiber reinforced low-density unsaturated polyester resin (LCGFR-LDUPR) composite materials with light weight and excellent mechanical properties were prepared. It was proved that long chopped glass fiber, which was in length of 15.0 mm and chopped from ER4800-T718 plied yarn, was suitable for the preparation of LCGFR-LDUPR composite samples. With the coexistence of 1.50 parts per hundred of resin (phr) of methyl ethyl ketone peroxide (MEKP-II) and 0.05 phr of cobalt naphthenate, optimal preparation parameters were obtained, which were 20.00 phr of long chopped glass fiber, 2.50 phr of NH<sub>4</sub>HCO<sub>3</sub>, at a curing temperature of 58.0 °C. The lowest dosage of activated radicals produced by MEKP-II and cobalt naphthenate enabled the lower curing exothermic enthalpy and the slowest crosslinking for unsaturated polyester resin to carry out, resulting in a higher curing degree of resin. It was conducive to the formation, diffusion, and distribution of bubbles in uniform size, and also to the constitution of ideal three-dimensional framework of long glass fibers in the cured sample, which resulted in the LCGFR-LDUPR composite sample presenting the apparent density (<i>ρ</i>) of 0.68 ± 0.02 g/cm<sup>3</sup>, the compression strength (<i>P</i>) of 35.36 ± 0.38 MPa, and the highest specific compressive strength (<i>P<sub>s</sub></i>) of 52.00 ± 0.74 MPa/g·cm<sup>3</sup>. The work carried out an ideal three-dimensional framework of long chopped glass fiber in the reinforcement to low-density unsaturated polyester resin composite samples. It also presented the proper initiator/accelerator system of the lower curing exothermic enthalpy and the slowest crosslinking for unsaturated polyester resin. |
| first_indexed | 2024-03-10T04:49:50Z |
| format | Article |
| id | doaj.art-e17497c66b1f403abc328f0612c3b536 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T04:49:50Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-e17497c66b1f403abc328f0612c3b5362023-11-23T02:41:36ZengMDPI AGMaterials1996-19442021-11-011423730710.3390/ma14237307Long Chopped Glass Fiber Reinforced Low-Density Unsaturated Polyester Resin under Different InitiationXinjun Fu0Xiaojun Wang1Jinjian Zhu2Minzhuang Chen3Department of Composite Materials, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211800, ChinaDepartment of Composite Materials, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211800, ChinaDepartment of Composite Materials, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211800, ChinaDepartment of Composite Materials, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211800, ChinaLong chopped glass fiber reinforced low-density unsaturated polyester resin (LCGFR-LDUPR) composite materials with light weight and excellent mechanical properties were prepared. It was proved that long chopped glass fiber, which was in length of 15.0 mm and chopped from ER4800-T718 plied yarn, was suitable for the preparation of LCGFR-LDUPR composite samples. With the coexistence of 1.50 parts per hundred of resin (phr) of methyl ethyl ketone peroxide (MEKP-II) and 0.05 phr of cobalt naphthenate, optimal preparation parameters were obtained, which were 20.00 phr of long chopped glass fiber, 2.50 phr of NH<sub>4</sub>HCO<sub>3</sub>, at a curing temperature of 58.0 °C. The lowest dosage of activated radicals produced by MEKP-II and cobalt naphthenate enabled the lower curing exothermic enthalpy and the slowest crosslinking for unsaturated polyester resin to carry out, resulting in a higher curing degree of resin. It was conducive to the formation, diffusion, and distribution of bubbles in uniform size, and also to the constitution of ideal three-dimensional framework of long glass fibers in the cured sample, which resulted in the LCGFR-LDUPR composite sample presenting the apparent density (<i>ρ</i>) of 0.68 ± 0.02 g/cm<sup>3</sup>, the compression strength (<i>P</i>) of 35.36 ± 0.38 MPa, and the highest specific compressive strength (<i>P<sub>s</sub></i>) of 52.00 ± 0.74 MPa/g·cm<sup>3</sup>. The work carried out an ideal three-dimensional framework of long chopped glass fiber in the reinforcement to low-density unsaturated polyester resin composite samples. It also presented the proper initiator/accelerator system of the lower curing exothermic enthalpy and the slowest crosslinking for unsaturated polyester resin.https://www.mdpi.com/1996-1944/14/23/7307long chopped glass fiberlow-density unsaturated polyester resininitiation mechanismradical |
| spellingShingle | Xinjun Fu Xiaojun Wang Jinjian Zhu Minzhuang Chen Long Chopped Glass Fiber Reinforced Low-Density Unsaturated Polyester Resin under Different Initiation Materials long chopped glass fiber low-density unsaturated polyester resin initiation mechanism radical |
| title | Long Chopped Glass Fiber Reinforced Low-Density Unsaturated Polyester Resin under Different Initiation |
| title_full | Long Chopped Glass Fiber Reinforced Low-Density Unsaturated Polyester Resin under Different Initiation |
| title_fullStr | Long Chopped Glass Fiber Reinforced Low-Density Unsaturated Polyester Resin under Different Initiation |
| title_full_unstemmed | Long Chopped Glass Fiber Reinforced Low-Density Unsaturated Polyester Resin under Different Initiation |
| title_short | Long Chopped Glass Fiber Reinforced Low-Density Unsaturated Polyester Resin under Different Initiation |
| title_sort | long chopped glass fiber reinforced low density unsaturated polyester resin under different initiation |
| topic | long chopped glass fiber low-density unsaturated polyester resin initiation mechanism radical |
| url | https://www.mdpi.com/1996-1944/14/23/7307 |
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