

FOLLOWUS
The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
jinghuang@jiangnan.edu.cn (J.H.)
wfdong@jiangnan.edu.cn (W.F.D.)
Received:21 March 2023,
Revised:2023-4-29,
Accepted:05 May 2023,
Online First:15 June 2023,
Published:01 December 2023
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Zhou, X. W.; Huang, J.; Zhang, X. H.; Li, T.; Wang, Y.; Wang, S. B.; Xia, B. H.; Dong, W. F. Design of tough, yet strong, heat-resistant PLA/PBAT blends with reconfigurable shape memory behavior by engineering exchangeable covalent crosslinks. Chinese J. Polym. Sci. 2023, 41, 1868–1878
Xiao-Wen Zhou, Jing Huang, Xu-Hui Zhang, et al. Design of Tough, yet Strong, Heat-resistant PLA/PBAT Blends with Reconfigurable Shape Memory Behavior by Engineering Exchangeable Covalent Crosslinks[J]. Chinese Journal of Polymer Science, 2023, 41(12): 1868-1878.
Zhou, X. W.; Huang, J.; Zhang, X. H.; Li, T.; Wang, Y.; Wang, S. B.; Xia, B. H.; Dong, W. F. Design of tough, yet strong, heat-resistant PLA/PBAT blends with reconfigurable shape memory behavior by engineering exchangeable covalent crosslinks. Chinese J. Polym. Sci. 2023, 41, 1868–1878 DOI: 10.1007/s10118-023-2997-0.
Xiao-Wen Zhou, Jing Huang, Xu-Hui Zhang, et al. Design of Tough, yet Strong, Heat-resistant PLA/PBAT Blends with Reconfigurable Shape Memory Behavior by Engineering Exchangeable Covalent Crosslinks[J]. Chinese Journal of Polymer Science, 2023, 41(12): 1868-1878. DOI: 10.1007/s10118-023-2997-0.
Exchangeable hydroxyl-ester crosslinks were programmed into biodegradable PLA/PBAT blends by straightforward reactive blending. The resultant vitrimeric PLA/PBAT blends show concurrently and significantly enhanced tensile strength
toughness
and heat resistance due to the greatly improved interfacial adhesion and the network structure. Moreover
the vitrimeic PLA/PBAT blends exhibit good reconfigurable shape memory behavior.
Polylactide (PLA) has often been blended with biodegradable poly(butylene adipate-
co
-terephthalate) (PBAT) to improve its toughness. However
the strength and heat resistance of PLA are always sacrificed. Herein
exchangeable hydroxyl-ester crosslinks are constructed in PLA/PBAT blends by successively introducing a tertiary amine-containing polyol
bis-(2-hydroxyethyl)amino-tris (hydroxymethyl)methane (BTM) and 4
4’-diphenylmethane diisocyanate (MDI)
via
reactive blending. BTM can react with both PLA and PBAT by transesterification
generating PLA or PBAT chains with terminal or pendant hydroxyl groups
which can then react with MDI to form networks. With internal catalysis of tertiary amine moiety in BTM
transesterification between the residual hydroxyl groups and ester bonds can occur at high temperatures
endowing the PLA/PBAT network with vitrimeric properties. Owning to the transesterification and chain extension reactions with MDI between PLA and PBAT
the interfacial adhesion is greatly improved. As a result of the excellent interfacial adhesion and the network structure
the prepared PLA/PBAT blends show greatly enhanced heat resistance and toughness (more than 40 times that of PLA) while maintaining high stiffness comparable to PLA. Furthermore
the prepared PLA/PBAT blends exhibit promising reconfigurable shape memory behavior. The present work provides a new and facile way to achieve high-performance and functional biodegradable polymeric materials.
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