Study On The Slow Relaxation Behavior Of Polymers In Several Typical Multiphase Systems

The softening dispersing transitions in glass-rubber transition region have been the best attractive and controversial topic in the field of condense matter physics. However, the slower processes are the best interesting and valuable for both theory study and applications. In this paper, using two-dimensional analysis, we detected local segmental motions, sub-Rouse modes and Rouse modes. Through standard emulsion polymerization, the BA and EA monomers were copolymerized with IP monomers, while the tanδ of PBA-co-IP and PEA-co-IP became asymmetric. On basis of DSC and TEM, it is found that no phase separation happens in PBA-co-IP and PEA-co-IP. After using TTS to procedure DMA data, we draw the corresponding relaxation spectra and proposed "Chain-ring" model to explain this phenomenon, meanwhile we also calculated their dynamics fragility index, and found their dynamics fragility index decreased after introducing IP monomers in their molecular chains, which is well fitted to the result of relaxation spectra. Finally, using melt-mixing, we prepared HDPE/ⅡR and EVA/ⅡR blends. For HDPE/ⅡR system, we found linear confinement from HDPE phase to ⅡR, whereas for EVA/IIR system, we used differentia spectra of dynamic mechanical analysis and found the confinement from EVA on local segments motions, sub-Rouse modes and Rouse modes of ⅡR,...