Imperial College London

Prof Milo Shaffer

Faculty of Natural SciencesDepartment of Chemistry

Professor of Materials Chemistry
 
 
 
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Contact

 

+44 (0)20 7594 5825m.shaffer Website

 
 
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Assistant

 

Mr John Murrell +44 (0)20 7594 2845

 
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Location

 

M221Royal College of ScienceSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Zhu:2018:10.1021/acs.macromol.7b02690,
author = {Zhu, Y and Radlauer, MR and Schneiderman, DK and Shaffer, MSP and Hillmyer, MA and Williams, CK},
doi = {10.1021/acs.macromol.7b02690},
journal = {Macromolecules},
pages = {2466--2475},
title = {Multiblock polyesters demonstrating high elasticity and shape memory effects},
url = {http://dx.doi.org/10.1021/acs.macromol.7b02690},
volume = {51},
year = {2018}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - 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
AU - Zhu,Y
AU - Radlauer,MR
AU - Schneiderman,DK
AU - Shaffer,MSP
AU - Hillmyer,MA
AU - Williams,CK
DO - 10.1021/acs.macromol.7b02690
EP - 2475
PY - 2018///
SN - 0024-9297
SP - 2466
TI - Multiblock polyesters demonstrating high elasticity and shape memory effects
T2 - Macromolecules
UR - http://dx.doi.org/10.1021/acs.macromol.7b02690
UR - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000430022000007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR - http://hdl.handle.net/10044/1/67340
VL - 51
ER -