Mechanical And Structural Consequences Of Associative Dynamic Cross-Linking In Acrylic Diblock Copolymers
MACROMOLECULES(2021)
摘要
The composition of low-T-g n-butylacrylate-block-(acetoxyaceto)-ethyl acrylate block polymers is investigated as a strategy to tune the properties of dynamically cross-linked vinylogous urethane vitrimers. As the proportion of the cross-linkable block is increased, the thermorheological properties, structure, and stress relaxation evolve in ways that cannot be explained by increasing cross-link density alone. Evidence is presented that network connectivity defects such as loops and dangling ends are increased by microphase separation. The thermomechanical and viscoelastic properties of block-copolymer-derived vitrimers arise from the subtle interplay of microphase separation and network defects.
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关键词
acrylic diblock copolymers,cross-linking
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