| タイトル | Influence of Molecular Weight on the Mechanical Performance of a Thermoplastic Glassy Polyimide |
| 本文（外部サイト） | http://hdl.handle.net/2060/19990115891 |
| 著者（英） | Gates, Thomas S.; Nicholson, Lee M.; Hinkley, Jeffrey A.; Whitley, Karen S. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 1999-11-01 |
| 言語 | eng |
| 内容記述 | Mechanical Testing of an advanced thermoplastic polyimide (LaRC-TM-SI) with known variations in molecular weight was performed over a range of temperatures below the glass transition temperature. The physical characterization, elastic properties and notched tensile strength were all determined as a function of molecular weight and test temperature. It was shown that notched tensile strength is a strong function of both temperature and molecular weight, whereas stiffness is only a strong function of temperature. A critical molecular weight (Mc) was observed to occur at a weight-average molecular weight (Mw) of approx. 22000 g/mol below which, the notched tensile strength decreases rapidly. This critical molecular weight transition is temperature-independent. Furthermore, inelastic analysis showed that low molecular weight materials tended to fail in a brittle manner, whereas high molecular weight materials exhibited ductile failure. The microstructural images supported these findings. |
| NASA分類 | Nonmetallic Materials |
| レポートNO | NAS 1.15:209720
L-17907
NASA/TM-1999-209720 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/95688 |
