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Dynamic mechanical analysis (DMA) at varied temperatures: (a) tanδ-temperature curves of PEVAs with different VA-contents. Two relaxation glass transition processes were observed for PE domains and copolymer chain. (b) tanδ-temperature curves of cPEVAs, where only one relaxation progress was observed as glass transition step of copolymer chain. (c) Storage modulus (E′)-temperature curves of PEVAs. (d) Storage modulus (E′)-temperature curves of cPEVAs.
