| Autor: |
Wu, He-Cheng, Shao, Shu-Ren, Dong, Shuo-Hong, Wang, Ao, Li, Zhen, Han, Xiang-Long, Luo, Feng, Li, Jie-Hua, Zhao, Dai-Guo, Lan, Wan-Ling, Tan, Hong |
| Předmět: |
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| Zdroj: |
Chinese Journal of Polymer Science (Springer Science & Business Media B.V.); Aug2023, Vol. 41 Issue 8, p1230-1237, 8p |
| Abstrakt: |
Temperature-accelerated in vitro degradation was established to estimate the longevity of polyurethane applied for long-term implantation. However, the prediction did not correlate well with the data from clinical explants and the rationality of accelerated in vitro test is still in a controversial due to the deviation. To improve the accuracy of the in vitro prediction, the influence of hydrogen bonding (HB) on the accelerated hydrolysis of silicone based polyetherurethans (SPEUs) extended with three side chains. Combining the temperature-controlled FTIR and the physical properties after temperature-accelerated in vitro degradation, it was demonstrated that side chain could increase the degree of hydrogen bond dissociation at higher temperature, resulting in the decrease of the calculated activation energy (Ea) of hydrolysis. At low temperatures, changes in surface morphology and molar mass of PEUs are minimal and HB are less easily dissociated, which had barely impact on the hydrolysis resistance. It was proposed that the Ea will not be impacted and that the accuracy of prediction will be increased if the acceleration temperature is lower than 70 °C and HB change is less than 15%. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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