Tragacanth gum-graft-polyacrylonitrile: synthesis, characterization and hydrolysis

Synthesis and characterization of slow‐release nitrogen fertilizer with water absorbency: Based on poly(acrylic acid‐acrylic amide)/Na‐bentonite

“…WA was measured by the tea‐bag method. This method is the most conventional, fast, and suitable for limited amount of samples 15, 16. The accurately weighted samples ( m 0 = 0.2 g) were placed into plastic bags (with fine meshes) and the bags were immersed into 500 mL of distilled water and saline solution (0.9 wt % NaCl aqueous solution) to reach the equilibrium swelling at room temperature (25°C), respectively.…”

Preparation of pH‐sensitive hydrogels by graft polymerization of itaconic acid on tragacanth gum

“…Grafting decreases from 104% for an aqueous system to 33% for 50:50 water–DMF system and continues to decrease further to 24% as the DMF content in the mixture increases to 75%. Some published work has shown that homopolymer formation takes place as a part of the graft polymerization process . Interestingly, we did not obtain any homopolymer during the grafting process suggesting that the current process leads to a better purity of the hydrogel.…”

“…Some published work has shown that homopolymer formation takes place as a part of the graft polymerization process. 33 Interestingly, we did not obtain any homopolymer during the grafting process suggesting that the current process leads to a better purity of the hydrogel. It seems that the swelling of the polymer in the grafting medium and the diffusion of monomer within the TG matrix play a significant role during the grafting.…”

Separation of oil from oily wastewater by sorption and coalescence technique using ethanol grafted polyacrylonitrile

“…It can be seen from the spectrum of the MPANF without hydrolysis (Fig. 2b) that the intensity of the peak at 3454 cm −1 had increased greatly, suggesting possi- [13,20,21]. The new N-H bonds may be produced during alcoholysis of nitrile groups to imidate esters.…”