2011 Volume 47 Issue 2 Pages 46-52
FID signal of the macroscopic magnetization obtained by measurement of a pulsed NMR is data with very much amount of information of molecular structure，a degree of crystallinity，entanglement，etc. We havecomposed a program of calculating a relaxation spectrum by carrying out numerical differentiation of this FID signal directly.This relaxation spectrum has a close relation to the viscoelastic property of a acromolecule. So， we measured the pulsed NMRand dynamic mechanical analysis of the styrene block co-polymer，and analyzed the relation between a relaxation spectrumand the temperature dependency of a dynamic mechanical analysis (DMA) . As a result，the followings became clear. (1) In a low-temperature region，The temperature where a loss modulus changes is the same as the temperaturewhich thepeak value time of a relaxation spectrum shifts greatly. These results show that pulsed NMR and DMA have measured a flowability change of a macromolecule. (2) The relaxation spectrum of 40 µs or less shows that PS block exists as a hard phase near 100℃. From the result of DMA data， it became clear that the flow have taken place with the state where PS domains are formed，in the polymer with many SI diblock contents.
