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• Fig. S1. Gel-like polypseudorotaxane α-CD–PEG–Ts₂ inclusion complexes, in which α-CDs are threaded by linear PEG-Ts₂.
• Fig. S2. ¹H NMR spectrum of polyrotaxane α-CD–PEG–MA₂ in DMSO-d₆.
• Fig. S3. ¹H NMR spectrum of polyrotaxane macroinitiator 18Br–α–CD–PEG-MA₂ in CDCl₃.
• Fig. S4. ¹H NMR spectrum of worm-like PtBA (sample 1 in Table 1) in CDCl₃.
• Fig. S5. ¹H NMR spectrum of worm-like PtBA-b-PS (sample 1 in Table 1) in CDCl₃.
• Fig. S6. ¹H NMR spectrum of worm-like PAA-b-PS (sample 1 in Table 1) in DMF-d₇.
• Fig. S7. GPC traces of worm-like PtBA (blue) and PtBA-b-PS (red) (sample 1 in Table 1).
• Fig. S8. XRD pattern of semiconductor CdSe nanonecklaces.
• Fig. S9. XRD pattern of magnetic Fe₃O₄ nanonecklaces.
• Fig. S10. XRD pattern of ferroelectric BaTiO₃ nanonecklaces.
• Fig. S11. EDS spectrum of semiconductor CdSe nanonecklaces.
• Fig. S12. EDS spectrum of magnetic Fe₃O₄ nanonecklaces.
• Fig. S13. EDS spectrum of ferroelectric BaTiO₃ nanonecklaces.
• Fig. S14. Graphic illustration of the initial condition for q_A(r, 0).
• Fig. S15. Spherical micelles of 18-arm star-like diblock copolymer in the mixed solvents of DMF/BA.
• Fig. S16. The calculated density profiles of A block (inner PAA) and B block (outer PS) in star-like diblock copolymers.
• Fig. S17. (a) TEM image of a number of CdSe nanonecklaces obtained by dropcasting a high-concentration CdSe nanonecklace DMF solution on the TEM grid. (b) The corresponding histogram of the length distribution of CdSe nanonecklaces shown in (a).
• Fig. S18. An ultralong CdSe nanonecklace.
• Table S1. Calculated dimensions of elongated ellipsoid-shaped PAA-b-PS diblock copolymers on the PEG chain.
• Scheme S1. Chain-extension reaction for the formation of chain-extended linear PEG.

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