Citation: Jin-xian Zhai, Zheng-yang Qu, Ye-cheng Zou, Xiao-yan Guo, Rong-jie Yang. Study on Preparation and Properties of Polyether Polytriazole Elastomers[J]. Chinese Journal of Polymer Science, ;2015, 33(4): 597-606. doi: 10.1007/s10118-015-1610-6 shu

Study on Preparation and Properties of Polyether Polytriazole Elastomers

1.
School of Materials, Beijing Institute of Technology, Beijing 100081, China

Received Date: 29 July 2014
Revised Date: 8 October 2014

Fund Project: This work was financially supported by the National Natural Science Foundation of China (No. 51473022).

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 13C-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 mmolg-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 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 b show maxima and the strain 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 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.
- Click chemistry,
- Polytriazole,
- Elastomers,
- PTP(E-co-T)
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1.
沈阳化工大学材料科学与工程学院沈阳 110142