To explore the application of click chemistry in the field of elastomer materials

propargyl-terminated ethylene oxide-tetrahydrofuran copolymer (PTP(E-

co

-T)) was prepared from hydroxyl-terminated ethylene oxide-tetrahydrofuran copolymer (P(E-

co

-T)) by end-etherisation modification. FTIR and

13

C-NMR results indicate that P(E-

co

-T)-terminated hydroxyl was etherified thoroughly

yielding the target product PTP(E-

co

-T)

and the content of terminated alkynyl of PTP(E-

co

-T) was evaluated to be 0.428 mmol×g-1. Using a polyazide compound as a cross-linker

polytriazole elastomers with various functional molar ratio (

R

) values were prepared from PTP(E-

co

-T) by virtue of the CuAAC reaction. Mechanical property tests indicate that with the increase in

R

the modulus

E

and stress σ

b

of the polytriazole elastomers first increase and subsequently decrease

whereas the strain first decreases and later increases. The mechanical properties of the polytriazole elastomers show a parabolic dependence on the

R

value. Near the stoichiometric ratio

E

and σ

b

show maxima and the strain

ε

b

shows a minimum. Swelling tests demonstrate that the apparent molecular weight of polytriazole elastomer strands also first decreases and subsequently increases. At the stoichiometric ratio

the network structure possesses strands with a minimum apparent molecular weight and a maximum apparent density. Dynamic mechanical analysis reveals that the polytriazole elastomers presented damping peaks at approximately -64℃

corresponding to the glass transition of copolyether strands

and the elastomer exhibited the lowest dissipation factor tan

δ

at the stoichiometric ratio. Thermal analysis suggests that the weight-loss process of the polytriazole elastomer is characteristic of one-step decomposition

and the elastomer begins to decompose from polyether strands

not triazole groups.