TA Q20 instrument in a nitrogen atmosphere, at a heating rate of
20 C/min. Crosslink density was determined by an IIC XLDS-15
HT magnetic resonance crosslink density analyzer. Dynamic mechanical analysis (DMA) was conducted on a TA Q800 dynamic mechanical analyzer in tensile mode. All tests were performed at
3 Hz from 80 to 70 C, and the heating rate was set as 3 C/min.