Table 2.
Non-isothermal TGA measurements of AGBs free and based on BLs of RS from NaOH, NaOH-BH and KOH–NH4OH pulping reagents.
Sample code | Temp. range | DTG peak | Wt. remain at 450 °C, % | n order | R | Se | Ea (kJ/mol) | |
---|---|---|---|---|---|---|---|---|
AGB | 1st | 50–131.2 | 79.5 | 22.58 | – | – | – | – |
2nd | 189.9–512.1 | 293.7 | 1.5 | 0.974 | 0.184 | 232.7 | ||
232.7 | ||||||||
AGB1 | 1st | 38.7–154.2 | 80.3 | 34.2 | – | – | – | – |
2nd | 195.7–373.9 | 266.6 | 2 | 0.958 | 0.218 | 117.766 | ||
3rd | 373.6–562.2 | 447.8 | 2 | 0.949 | 0.228 | 187.002 | ||
304.768 | ||||||||
BL1 | 1st | 63.7–141.8 | 98.8 | 73.78 | – | – | – | – |
2nd | 142.2–219.3 | 184.9 | 2 | 0.961 | 0.2 | 173.153 | ||
3rd | 217.8–290.4 | 246.5 | 2 | 0.948 | 0.215 | 227.784 | ||
400.937 | ||||||||
AGB2 | 1st | 31.6–147.0 | 71.8 | 79.8 | – | – | – | – |
2nd | 206.1–379.2 | 287.1 | 2 | 0.959 | 0.213 | 123.407 | ||
3rd | 379.3–496.0 | 433.7 | 2 | 0.936 | 0.229 | 252.337 | ||
375.744 | ||||||||
BL2 | 1st | 50.1–192.8 | 126.6 | 75.85 | – | – | – | – |
2nd | 206.5–356.5 | 278.4 | 2 | 0.9707 | 0.193 | 145.227 | ||
3rd | 356.4–506.6 | 444.6 | 2 | 0.942 | 0.231 | 196.806 | ||
4th | 521.8–576.3 | 549.8 | 2 | 0.951 | 0.206 | 718.612 | ||
1060.645 | ||||||||
AGB3 | 1st | 39.9–118.9 | 81.1 | 67.05 | – | – | – | – |
2nd | 217.8–371.0 | 280.5 | 2 | 0.958 | 0.211 | 131.618 | ||
3rd | 375.0–534.6 | 443.9 | 2 | 0.953 | 0.222 | 217.286 | ||
348.904 | ||||||||
BL3 | 1st | 40.8–131.9 | 87.4 | 70.79 | – | – | – | – |
2nd | 141.1–357.5 | 231.6 | 2 | 0.968 | 0.23 | 102.468 | ||
3rd | 431.0–507.7 | 472.2 | 2 | 0.939 | 0.219 | 405.773 | ||
508.241 |