Microphase separation behavior was found and investigated for blends of cellulose diacetate (CA) with a diblock copolymer, PVP-b-PVAc, made up of poly(N-vinyl pyrrolidone) (PVP) and poly(vinyl acetate) (PVAc) chains. Three PVP-b-PVAc samples with different copolymer compositions were successfully synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization and characterized by 1H NMR and GPC measurements. CA/PVP-b-PVAc blends cast in film form were all highly transparent, but showed two Tgs in their DSC thermograms. This indicates that the PVP sequence in PVP-b-PVAc was miscible with CA on a scale of a few tens of nm, whereas the other sequence PVAc formed a single domain by itself due to its repellent character to both PVP and CA components. The microphase-separated structures into the CA/PVP and PVAc domains were visualized by TEM observations using ultra-thin slices of each CA/PVP-b-PVAc film. It was shown that the domain size and morphological pattern of the two-phase structure were controllable by changing the blend composition (CA: copolymer in wt.) as well as the copolymer composition (VP:VAc in mol).

Morphological change in the microphase separation of cellulose diacetate/diblock copolymer blends

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.