| 초록 |
Glass transition temperature(Tg) is an important temperature used to determine the processability and thermal stability of polymers as properties of polymer changes significantly. However, currently used methods to measure Tg, cannot measure in-situ, need to make separate samples, and are hard to measure polymers with complex structure. Here, we suggest a new novel technique to measure Tg of polymers using ball collision. As loss modulus of polymers have local maximum at Tg, polymers can dissipate energy maximally. So, it shows the lowest bouncing height at Tg. However, as measured Tg is result at high frequency, time-temperature superposition principle is used to convert measured Tg into lower frequency range. We expect lots of advantages in polymer academia and industry as it will be able to measure Tg of previously unmeasurable polymer materials. |
