Multiblock Polyesters Demonstrating High Elasticity and Shape Memory Effects

Yunqing Zhu, Madalyn R. Radlauer, Deborah K. Schneiderman, Milo S.P. Shaffer, Marc A. Hillmyer, Charlotte K. Williams

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Polyester block polymers containing polylactide have garnered significant attention as renewable, degradable alternatives to traditional elastomers. However, the low glass transition of the PLA blocks limits the upper-use temperatures of the resulting elastomers. To improve the thermal performance, we explore a series of multiblock polyesters composed of poly(ϵ-decalactone) (PDL) and poly(cyclohexene phthalate) (PCHPE). These materials are prepared using switchable polymerization catalysis followed by chain extension. The strategy involves (i) alternating ring-opening copolymerization (ROCOP) of cyclohexene oxide and phthalic anhydride, (ii) ϵ-decalactone ring-opening polymerization (ROP), and (iii) diisocyanate coupling of the telechelic triblocks to increase molar mass. The resulting multiblock polyesters are amorphous, and the blocks are phase separated; glass transition temperatures are ∼-45 and 100 °C. They show thermal resistance to mass loss with Td5% ∼ 285 °C and higher upper use temperatures compared to alternative aliphatic polyesters. The nanoscale phase behavior and correlated mechanical properties are highly sensitive to the block composition. The sample containing PCHPE = 26 wt % behaves as a thermoplastic elastomer with high elongation at break (ϵb > 2450%), moderate tensile strength (σb = 12 MPa), and low residual strain (ϵr ∼ 4%). It shows elastomeric behavior from -20 to 100 °C and has a processing temperature range of ∼170 °C. At higher PCHPE content (59 wt %), the material has shape memory character with high strain fixation (250%) and recovery (96%) over multiple (25) recovery cycles. The multiblock polyesters are straightforward to prepare, and the methods presented here can be extended to produce a wide range of new materials using a other epoxides, anhydrides, and lactones. This first report on the thermal and mechanical properties highlights the significant potential for this class of polyesters as elastomers, rigid plastics, and shape memory materials.

Original languageEnglish (US)
Pages (from-to)2466-2475
Number of pages10
JournalMacromolecules
Volume51
Issue number7
DOIs
StatePublished - Apr 10 2018

Bibliographical note

Funding Information:
The EPSRC (EP/L017393/1), EIT-Climate KIC (project EnCO2re), and the Imperial-CSC scholarship (to Y.Z.) are acknowledged for funding. Partial support of this work was provided by the Center for Sustainable Polymers, a NSF-supported Center for Chemical Innovation (CHE-1413862). We thank Dr. Matthew Irwin for assistance with the staining of TEM samples and Guilhem De Hoe and Dr. Alexander Todd for assistance with the tensile tests. SAXS measurements were performed at the DuPont−Northwestern−Dow Collaborative Access Team (DND-CAT) Synchrotron Research Center located at Sector 5 of the Advanced Photon Source. DND-CAT is supported by the E.I. DuPont de Nemours & Co., The Dow Chemical Company, the U.S. National Science Foundation through Grant DMR-9304725, and the State of Illinois through the Department of Commerce and the Board of Higher Education Grant IBHE HECA NWU 96. Use of Advanced Photon Source was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Science, under Contract W-31-109-Eng 38.

Funding Information:
The EPSRC (EP/L017393/1), EIT-Climate KIC (project EnCO2re), and the Imperial-CSC scholarship (to Y.Z.) are acknowledged for funding. Partial support of this work was provided by the Center for Sustainable Polymers, a NSF-supported Center for Chemical Innovation (CHE- 1413862). We thank Dr. Matthew Irwin for assistance with the staining of TEM samples and Guilhem De Hoe and Dr. Alexander Todd for assistance with the tensile tests. SAXS measurements were performed at the DuPontâ€"Northwesternâ€"Dow Collaborative Access Team (DND-CAT) Synchrotron Research Center located at Sector 5 of the Advanced Photon Source. DND-CAT is supported by the E.I. DuPont de Nemours & Co., The Dow Chemical Company, the U.S. National Science Foundation through Grant DMR-9304725, and the State of Illinois through the Department of Commerce and the Board of Higher Education Grant IBHE HECA NWU 96. Use of Advanced Photon Source was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Science, under Contract W-31-109-Eng 38.

Publisher Copyright:
© 2018 American Chemical Society.

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