Figure 3. The thermal properties of acrylic acid derivative
terpolymer. (a) The thermal gravimetric (TG) curves of LA136D, PVDF,
and SBR, the proportions of volatiles generated in the three binders
thermal decomposition are 39.2wt %, 77.6wt % and
99.2wt % respectively; (b) the differential coefficient of the TG
curves in (a), it is shown LA136D has the lowest volatiles generation
rate in the thermal decomposition; (c) the Fourier-transform infrared
spectroscopy (FTIR) results of LA136D before and after 550 °C treatment,
it is shown there are some C−N and C−O groups in the solid residues,
which indicates C≡N and C=O are beneficial to reach a low volatile
proportion in thermal decomposition; (d) the in-situ analysis of the
gaseous fragments produced in LA136D thermal decomposition by using
TG-FTIR; (e) The proposed thermal decomposition process of LA136D at the
high temperatures.
To further study the thermal decomposition process of LA136D, we studied
the gas products of LA136D by TG-FTIR. The result is shown inFigure 3 (d) . It is shown that few NH3 occur at
about 230 °C and spurts out after 300 °C, indicating the breaking of C−H
(possibly the ends of the main chain) and C−NH2. At the
same time, the CO2 generates at nearly 300 °C, indicates
the breaking of R−COOLi (the occurrence of CO2 before
300 °C is due to the background of TG-FTIR). The CH4 and
other C−H volatiles occur after 400°C, referring to the break of the
−C−C− chain, this can also be verified by the differential curve of
LA136D in Figure 3 (b) whereas the rate of thermal decomposition reaches
peak value. Based on the discussions above, the thermal decomposition
process and the gas products of LA136D can be described inFigure 3 (e) . When heating the LA136D, RCO−NH2,and R−COOLi begin to break at nearly 230 °C and 300 °C accompanying the
generation of NH3 and CO2 gaseous
respectively. The RCO−NH2 breaking rate reaches a peak
value at 320 °C. As the temperature keeps increasing to 400 °C, the main
chain −C−C− begins to break and CH4 or other C−H gaseous
fragments are produced. The break of R−COOLi goes with the whole heating
process.