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- W2086095478 abstract "Novel copolymers with controlled architectures can function as new building blocks for well-defined nanostructures on the basis of microphase separation, unlike conventional ABA triblock copolymers. A series of well-defined A(x)BA(x)-type block-graft copolymers consisting of soft middle segments (dodecyl methacrylate (DMA)) and hard outer graft chains (styrene (St)) were synthesized by ruthenium-catalyzed living radical block and graft polymerization. NMR spectroscopy and size-exclusion chromatography combined with multiangle laser light scattering confirmed the well-defined structure of the A(x)BA(x) block-graft copolymers with backbones and graft chains of controlled lengths. Transmission electron microscopy and transmission electron microtomography revealed a series of morphologies for the copolymers. Morphological changes were observed from PSt honeycomb cylinders to lamellae and poly(DMA) cylinders with increasing PSt-graft content, whereby the phase diagram was shifted significantly to lower volume fractions of the larger-number component (St) relative to those of the corresponding ABA triblock copolymers. More specifically, poly(DMA) cylinders were observed even before the St content reached 50 wt %. The A(x)BA(x) and ABA copolymers with 17-30 wt % of St exhibited characteristics of a thermoplastic elastomer with tensile strengths of 1-6 MPa and elongations at break of 70-300 %. These mechanical properties can be related well to the microphase structures of the A(x)BA(x) and ABA copolymers." @default.
- W2086095478 created "2016-06-24" @default.
- W2086095478 creator A5003740584 @default.
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- W2086095478 creator A5054367448 @default.
- W2086095478 creator A5069896089 @default.
- W2086095478 date "2007-05-04" @default.
- W2086095478 modified "2023-09-27" @default.
- W2086095478 title "AxBAx-Type Block–Graft Polymers with Soft Methacrylate Middle Segments and Hard Styrene Outer Grafts: Synthesis, Morphology, and Mechanical Properties" @default.
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- W2086095478 doi "https://doi.org/10.1002/asia.200600403" @default.
- W2086095478 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17455174" @default.
- W2086095478 hasPublicationYear "2007" @default.
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