Radical‐cured block copolymer‐modified thermosets
| العنوان: | Radical‐cured block copolymer‐modified thermosets |
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| المؤلفون: | Lorraine F. Francis, Erica M. Redline, Frank S. Bates |
| المصدر: | Journal of Polymer Science Part B: Polymer Physics. 49:540-550 |
| بيانات النشر: | Wiley, 2011. |
| سنة النشر: | 2011 |
| مصطلحات موضوعية: | Materials science, Polymers and Plastics, Ethylene oxide, Radical polymerization, Thermosetting polymer, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Micelle, 0104 chemical sciences, chemistry.chemical_compound, Monomer, chemistry, Polymer chemistry, Materials Chemistry, Copolymer, Physical and Theoretical Chemistry, 0210 nano-technology, Ethylene glycol, Elastic modulus |
| الوصف: | Poly(ethylene-alt-propylene)-b-poly(ethylene oxide) (PEP-PEO) diblock copolymers were synthesized and added at 4 wt % to 2,2-bis[4-(2-hydroxy-3-methacryloxypropoxy)phenyl]propane (BisGMA), a monomer that cures using free radical chemistry. In separate experiments, poly(ethylene glycol) dimethacrylate (PEGDMA) was combined as a secondary monomer with BisGMA and the monomers were loaded with 4 wt % PEP-PEO. The diblock copolymers self-assembled into well-dispersed spherical micelles with PEP cores and PEO coronas. No appreciable change in the final extent of cure of the thermosets was caused by the addition of diblock copolymer, except in the case of BisGMA, where the addition of the block copolymer increased extent of cure by 12%. Furthermore, the extent of cure was increased by 29% and 37% with the addition of 25 and 50 wt % PEGDMA, respectively. Elastic modulus and fracture resistance were also determined, and the values indicate that the addition of block copolymers does not significantly toughen the thermoset materials. This finding is surprising when compared with the large increase in fracture resistance seen in block copolymer-modified epoxies, and an explanation is proposed. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2011 |
| تدمد: | 1099-0488 0887-6266 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::1e8f7e379914418d34fc9a9d7f2da575 https://doi.org/10.1002/polb.22196 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........1e8f7e379914418d34fc9a9d7f2da575 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10990488 08876266 |
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