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- Title
Phase Structure of the Exact Graft Copolymer Synthesized by Iterative Methodology Based on Living Anionic Polymerization.
- Authors
Lin, Yu‐Hsuan; Chen, Hsin‐Lung; Goseki, Raita; Hirao, Akira
- Abstract
Exact graft copolymer (EGC) is a type of copolymer with precisely defined molecular parameters, including the number of grafts per molecule ( n), the length of the grafts ( lg), and the separation distance between the junction points (ε) in the backbone. In the present study, the phase structure of the EGC composed of poly(2-vinyl pyridine) backbone and polystyrene graft with n = 2 and n = 3 under fixed ε and lg is systematically investigated to seek a general understanding on the effect of the graft architecture on the domain spacing of the microphase-separated structure and the order-disorder transition temperature ( TODT). It is found that the TODT associated with the fluctuation-induced ODT of the EGC increases with increasing n due to the increase of the total molecular weight. Nevertheless, the domain spacing does not exhibit a monotonic change with n, as the EGC with n = 2 shows the largest domain spacing compared with that of EGC with n = 3 and the corresponding linear diblock copolymer. The experimental observation on the domain spacing is explained by a thermodynamic model considering the packing mode of the constituting chains under the junction constraint.
- Subjects
GRAFT copolymers; PHASE transitions; CRYSTAL structure; COPOLYMERIZATION; ADDITION polymerization
- Publication
Macromolecular Chemistry & Physics, 2017, Vol 218, Issue 12, pn/a
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201700150