Asymmetric Miktoarm Star Polymers as Polyester Thermoplastic Elastomers

Blankenship, Jacob R.; Levi, Adam E.; Goldfeld, David J.; Self, Jeffrey L.; Alizadeh, Nima; Chen, Duyu; Fredrickson, Glenn H.; Bates, Christopher M.

doi:10.1021/acs.macromol.2c00214

Asymmetric Miktoarm Star Polymers as Polyester Thermoplastic Elastomers

Journal Article · Fri Jun 10 00:00:00 EDT 2022 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.2c00214· OSTI ID:1971662

Blankenship, Jacob R. ^[1]; Levi, Adam E. ^[2]; Goldfeld, David J. ^[2]; ^[2]; ^[2]; Chen, Duyu ^[2]; ^[2]; ^[2]

Univ. of California, Santa Barbara, CA (United States); UC Santa Barbara
Univ. of California, Santa Barbara, CA (United States)

A library of polyester-based A(BA')_n asymmetric miktoarm star polymers was synthesized with A, A' = poly(l-lactide) (PLLA) as the semicrystalline hard blocks and B = poly(4-methylcaprolactone) (PMCL) as the soft segment using a grafting-through platform known as μSTAR. The synthetic versatility of μSTAR enabled a systematic investigation of architectural design parameters, in particular the number of BA' arms (n), while holding the A, A', and B block lengths constant. The value of n has a pronounced impact on the mechanical properties of these high-molecular-weight miktoarm materials. Tensile toughness increases with n, an effect likely related to bridging, as the modulus drops because the hard-block volume fraction decreases. Furthermore, these insights expand our understanding of architecture effects in sustainable thermoplastic elastomers.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Santa Barbara, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019001

OSTI ID:: 1971662

Journal Information:: Macromolecules, Journal Name: Macromolecules Journal Issue: 12 Vol. 55; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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