Graft copolymerization of acrylonitrile and its amidoxime derivative onto chitosan

Abstract

Acrylonitrile (AN) was investigated as an important monomer for the graft copolymerization onto chitosan. A number of variables in the grafting reaction were investigated, including initiator and monomer concentration, duration, and temperature of the polymerization reaction. The graft copolymers were evaluated in terms of graft yield, grafting efficiency and % homopolymer. Moreover, modification of grafted chitosan was done by changing the nitrile group (ACN) to the amidoxime group (AC¼ ¼NOH). Certain characterization for both the grafted Chitosan (Ch-g-PAN) and its amidoxime derivative -as compared to the parent polymer-are measured including the swell ability property, dye uptake, surface morphology, and metal uptake property. The results obtained reflect the feasibility for using Ch-g-PAN as absorbent for both Ni 2þ and Co 2þ ions.

Electrospinning of thermo-regulated sheath/core submicrometer fiber with galactitol hexa palmitate as a core

“…The peak observed at 2243 cm –1 corresponds to the -CN group that is special to the P(AN- co -VDC) moiety. 26 The peak observed at 1739 cm –1 corresponds to the C = O group of GHP and its intensity gradually increases as the concentration of the core component is increasing. The peak intensity of the C = O group of the sample e decreases because the concentration of the core component is too high, and the sheath solution is too hard to be wrapped around it.…”

Preparation, Properties and Applications of Chitosan-Based Biocomposites/Blend Materials: A Review

“…13(d)) is one of the most important films forming polymers and has been widely used because of its high strength, abrasion resistance and good insect resistance (Table 5) [257]. However, it also has some disadvantages, such as strong hydrophobicity and electrostatic accumulation, because it lacks segmental mobility as a result of intensive molecular orientation of the highly polar nitrile groups [258]. There have been many attempts to improve on the properties and reduce those limitations, and blending with hydrophilic Cs polymer is one of the promising ways of doing this.…”

Graft modification of carboxymethyl chitosan with styrene and its biological applications

“…where W 0 , W 1 are the weights of initial matrix and grafted matrix (i.e., weight of the product after extraction), respectively. Whereas W 2 is the crude product before extraction [26].…”