With the increasing concern about
global environmental issues,
reducing the carbon footprint to achieve carbon neutrality has been
particularly important. Sustainable multiblock copolymer elastomers
(MBCPEs) have received tremendous interest due to their unprecedented
performance and huge potential applications. However, complex multistep
polymerization and postpolymerization processes are needed to design
MBCPEs. In this work, a series of MBCPEs, in which vanillin acrylate
(VA) derived from lignin was selected as the renewable rigid segments
for the glassy block, while methyl acrylate (MA) was chosen as the
soft segments for the rubbery block, were prepared by two successive
reversible addition–fragmentation chain transfer (RAFT) polymerization
processes with polytrithiocarbonate (PTTC). These thermally stable
MBCPEs exhibit distinct microphase-separated morphology, where the
hard poly(vanillin acrylate) (PVA) blocks self-assemble into discrete
glassy domains serving as the physical cross-linking points in the
soft poly(methyl acrylate) (PMA) matrix. The macroscopic mechanical
performance, such as tensile strength, stretchability, toughness,
and elastic recovery, can be adjusted well by changing the molecular
weights and PVA contents. Moreover, these sustainable MBCPEs can be
applied as strong adhesives and excellent UV-shielding materials,
broadening their potential applications. This novel strategy is convenient
and robust by combining RAFT polymerization and renewable resources
toward high-performance MBCPEs, which can open a new avenue for the
development of sustainable biobased elastomers.