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Triblock Copolymer Elastomers with Enhanced Mechanical Properties Synthesized by RAFT Polymerization and Subsequent Quaternization through Incorporation of a Comonomer with Imidazole Groups of about 2.0 Mass Percentage
journal contribution
posted on 2017-08-11, 20:19 authored by Feng Jiang, Chu Fang, Juan Zhang, Wentao Wang, Zhigang WangABA triblock copolymer elastomers
(TBCPEs) were first synthesized
via reversible addition–fragmentation chain transfer (RAFT)
polymerization, for which poly(isobornyl acrylate) (PIBA) was chosen
as the dispersed hard microdomains, whereas poly(n-butyl acrylate)-co-poly(1-vinylimidazole) (P(BA-co-VI)) was chosen as the rubbery matrix. Two much distinct
glass transition temperatures were found, corresponding to the soft
matrix and hard microdomains, respectively. Although the mass percentages
of the incorporated third comonomer, 1-vinylimidazole, were just about
2.0%, the imidazole groups on the TBCPE chains could be ionically
cross-linked by 1,6-dibromohexane to bring these TBCPEs into much
strong ones, half-cross-linked TBCPEs-HC and full-cross-linked TBCPEs-FC.
It is interesting to demonstrate that the ultimate tensile strength
for TBCPEs-FC could be increased up to 10 times that for TBCPEs, and
the elastic recovery could also be improved to above 90%, while the
elongation at break just showed modest decreases. Transmission electron
microscope (TEM) and small-angle X-ray scattering (SAXS) measurements
disclosed that TBCPEs, TBCPEs-HC, and TBCPEs-FC all had typical microphase-separated
morphology, with the interdomain distance tunable by the molecular
mass of TBCPEs. In-situ SAXS measurements revealed that the hard microdomains
in TBCPEs-HC could be orientated along the tensile direction during
stretching and be recovered to the original state after stress release.
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full-cross-linked TBCPEs-FCmicrophase-separated morphologyimidazole groupsIn-situ SAXS measurementsmicrodomain1- vinylimidazoleSubsequent Quaternization2.0 Mass Percentage ABA triblock copolymer elastomersImidazole GroupsTEMionically cross-linkedTriblock Copolymer Elastomersstress releasePIBAEnhanced Mechanical Properties Synthesizedglass transition temperaturesmass percentagestransmission electron microscope10 timessmall-angle X-rayTBCPE chainsinterdomain distance tunableVIRAFT Polymerizationhalf-cross-linked TBCPEs-HC
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