10.1021/acs.macromol.7b01414.s001
Feng Jiang
Feng
Jiang
Chu Fang
Chu
Fang
Juan Zhang
Juan
Zhang
Wentao Wang
Wentao
Wang
Zhigang Wang
Zhigang
Wang
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
American Chemical Society
2017
full-cross-linked TBCPEs-FC
microphase-separated morphology
imidazole groups
In-situ SAXS measurements
microdomain
1- vinylimidazole
Subsequent Quaternization
2.0 Mass Percentage ABA triblock copolymer elastomers
Imidazole Groups
TEM
ionically cross-linked
Triblock Copolymer Elastomers
stress release
PIBA
Enhanced Mechanical Properties Synthesized
glass transition temperatures
mass percentages
transmission electron microscope
10 times
small-angle X-ray
TBCPE chains
interdomain distance tunable
VI
RAFT Polymerization
half-cross-linked TBCPEs-HC
2017-08-11 20:19:24
Journal contribution
https://acs.figshare.com/articles/journal_contribution/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/5305483
ABA 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(<i>n</i>-butyl acrylate)-<i>co</i>-poly(1-vinylimidazole) (P(BA-<i>co</i>-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.