| 
   where, C= composite, IDT = initial decomposition temperature, FDT= final decomposition
  | Sample Hs-g-poly-
 | Pg | TGA | DTA |  
  | IDT | FDT | % Residue | Peaks in °C(μV) |  
  | H. sabdariffa | - | 225.7 | 463.0 | 20.00 | 139.7 (6), 327.9 (18.0), 422.7 (14) |  
  | (EA) | 117.3 | 312.4 | 500.0 | 06.70 | 125.0 (2), 361.2 (1.2), 432.5 (29) |  
  | (EA-co-AN) | 175.1 | 268.0 | 520.0 | 03.30 | 176.4 (17.1), 340.0(21), 425 (22.7) |  
  | (EA-co-MA) | 179.9 | 339.6 | 542.7 | 28.33 | 152.0 (1.2), 341.8(3.3), 399.4 (17) |  
  | Phenoplast | - | 500.0 | 600.0 | - | 551.0 (150) |  
  | Hs-r-PF-C | - | 540.0 | 680.0 | 10.0 | 610.0 (164) |  temperature.
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