Thermal and crystallization behaviour of epoxidized high cis-polybutadiene rubber
| العنوان: | Thermal and crystallization behaviour of epoxidized high cis-polybutadiene rubber |
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| المؤلفون: | Camila Ramirez, Frederico Anderson Passos Schoene, Marcos L. Dias, Lys Sirelli, Isabela A. Graciano, Raquel Pires Gonçalves |
| المصدر: | Journal of Rubber Research. 22:195-201 |
| بيانات النشر: | Springer Science and Business Media LLC, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Materials science, 020502 materials, Organic Chemistry, Enthalpy, 02 engineering and technology, Plant Science, 021001 nanoscience & nanotechnology, law.invention, Amorphous solid, Crystallinity, Polybutadiene, 0205 materials engineering, Natural rubber, Chemical engineering, law, visual_art, visual_art.visual_art_medium, Thermal stability, Crystallization, 0210 nano-technology, Glass transition |
| الوصف: | High cis-polybutadiene (HCBR) was epoxidized by using in situ formed formic acid and hydrogen peroxide in the absence and presence of Tween 20 at 50 °C at different reaction times. Epoxidized HCBR (EHCBR) with degree of epoxidation from 3.7 to 38.8% was obtained. Low degree epoxidation EHCBR are semi-crystalline rubbers presenting lower crystallization temperatures than the non-epoxidized rubber on cooling and a cold crystallization and melting temperature on heating, differently from high epoxidation content rubbers (over 10%) which are amorphous materials. Epoxidation increases the glass transition temperature and decreases the melting temperature and the degree of crystallinity of the polybutadiene. The increase of epoxidation also decreases its thermal stability, which drops about 28 °C when the content of epoxidation is increased about 30%. Non-isothermal crystallization experiments of HCBR and EHCBR were systematically carried out at cooling rates of 5, 10, 20, and 30 °C/min to evaluate the crystallinity developed upon cooling. By increasing the cooling rate, the crystallization enthalpy increases for HCBR while it decreases for EHCBR. |
| تدمد: | 2524-3993 1511-1768 |
| DOI: | 10.1007/s42464-019-00028-5 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::2739598c28714896f679adba160a3270 https://doi.org/10.1007/s42464-019-00028-5 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi...........2739598c28714896f679adba160a3270 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 25243993 15111768 |
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| DOI: | 10.1007/s42464-019-00028-5 |