Macromolecules· 2026Q1
Impact of Precision Sequence on Microphase Separation of Graft Copolymers Bearing Immiscible Polymer Chains: Alternating versus Random Architectures
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- Q1SCImago
- 2026year
Short summary
Graft alternating copolymers of polystyrene (PS) and polylactide (PLA) exhibit sharper microphase separation and smaller domain spacing compared to random and block copolymers with identical chain lengths.
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Key points
- Graft alternating copolymers of PS and PLA were synthesized with controlled backbone and graft chain lengths.
- Microphase separation behavior was compared between alternating, random, and block copolymers of identical composition.
- Alternating copolymers showed sharper scattering peaks and smaller domain spacing than random copolymers.
- A lamellar morphology was observed at a 5:5 volume fraction, and a cylindrical morphology at a 7:3 volume fraction in alternating copolymers.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract Graft alternating copolymers bearing polystyrene (PS) and polylactide (PLA) graft chains were precisely synthesized via selective cyclopolymerization of a pendant-transformable divinyl monomer followed by postpolymerization modification for chain incorporation via a grafting-to and grafting-from approach. The number-averaged polymerization degrees (DPn’s) of both the backbone and graft chains were precisely controlled. Importantly, the corresponding graft “random” copolymers as well as the PS-PLA block copolymers of identical DPn’s were also synthesized to enable direct comparison of their microphase separation behaviors. The graft alternating copolymers with a volume fraction of approximately 5:5 exhibited periodic scattering peaks attributable to a lamellar morphology in the SAXS profile. These peaks of the graft alternating copolymers were significantly sharper than those observed for the random and block architectures, and the domain spacing was smaller than those observed for the random architectures. This trend became even more pronounced at a volume fraction of approximately 7:3, where a cylindrical morphology was formed.
The authors' abstract, as published at the source. Macromolecules, 2026 · DOI ↗
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Field: Materials Chemistry
Materials ChemistryMaterials Science