| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for measuring crystallinity capable of accurately obtaining degrees of crystallinity of various kinds of thermoplastic resin, by using a pulse NMR (Nuclear Magnetic Resonance) method.SOLUTION: While a sample containing thermoplastic resin is maintained at a constant temperature that is higher by 130°C or more than a glass-transition temperature of the thermoplastic resin, a free induction decay curve of a spin-spin relaxation time ofH(hydrogen nucleus)-NMR by a pulse NMR method is obtained. Based on the free induction decay curve, a degree of crystallinity is measured as a percentage of a crystal phase accounted for in a total amount of the crystal phase and an amorphous phase included in the thermoplastic resin. |
