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Hydrogenation of di-2-ethylhexyl phthalate results in the interaction difference between it and PVC.Low-Field 1H NMR results showed a phase diagram of mobility,in which the significant difference is that PVC chains could restrict much more DEHHP molecules than DOP.FTIR results showed that the interaction exists by a form of hydrogen bonding complex and it was stronger in PVC/DEHHP than in PVC/DOP system.