Graft copolymerization of methyl methacrylate onto gelatin using KMnO 4 ‐H 2 SO 4 redox system

Thaker

J of Applied Polymer Sci

2014

Photo‐induced graft copolymerization of acrylonitrile (AN) onto sodium salt of partially carboxymethylated guar gum (Na‐PCMGG, DStrue¯ = 0.291) was carried out in an aqueous medium using ceric ammonium nitrate (CAN) as photo‐initiator to synthesize a novel graft copolymer, Na‐PCMGG‐g‐PAN, which may find potential application as a superabsorbent hydrogel. Studying the influence of concentrations of photo‐initiator (CAN), nitric acid, monomer (AN) as well as reaction time, temperature, and amount of substrate on the grafting yields, the reaction conditions for optimum grafting were evaluated. Maximum values of the grafting yields achieved were %G = 285.77 and %GE = 70.76 at optimized conditions. The proposed kinetic scheme could explain very well the experimental results. The influence of different kind of acids on the grafting yields was also studied. Grafting process was confirmed with the help of FTIR, thermal (TGA/DSC), and SEM techniques. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41371.

“…In addition, the decrease in the monomer‐to‐backbone ratio also accounted for the observed decrease in % G . Similar observations have also been reported earlier …”

Section: Resultssupporting

confidence: 93%

“…Similar observations have also been reported earlier. [16][17][18][19][20][21] ARTICLE WILEYONLINELIBRARY.COM/APP…”

Section: Effect Of Backbone Concentrationmentioning

confidence: 99%

Photo‐induced graft copolymerization of acrylonitrile onto sodium salt of partially carboxymethylated guar gum

Thaker

J of Applied Polymer Sci

2014

“…The decrease of moisture regain is a result of the hydrophobic character of PAN. This result agrees with the work of Havva Keles [12].…”

Section: Moisture Regain Of Collagen/pan Blending Fibersupporting

confidence: 94%

“…Schematic diagram of laboratory the wet spinning apparatus: (1) dissolution kettle, (2) candle filter, (3) middle kettle, (4) spinning kettle, (5) gear pump, (6) spinneret, (7) coagulation bath,(8) preheating bath, (9) washing bath, (10) stretching bath, (11) applying oil,(12) densification, and (13) winder.…”

mentioning

confidence: 99%

Preparation and characterization of modified collagen/PAN blending fibers

Zhang

Sun

2008

Fibers Polym

Graft modification of collagen with acrylonitrile in concentrated aqueous solution of sodium thiocyanate (NaSCN) is developed in this paper. This modification can largely change it's solubility in water and can be applied in fiber production. Grafting modified collagen is characterized by infrared spectrum and wide angle X-ray diffraction. Wet spinning of PAN fibers containing several content of modified collagen is performed. The tests about these fibers show that breaking strength and sonic orientation decrease as the amount of collagen is raised. The addition of collagen can largely improve the moisture regain of PAN fiber. Micro-appearance of fibers observed under scanning electron microscope (SEM) presents circular cross section and longitudinal grooves on surface, the depth of grooves increases with the increasing draw ratio.

Polymer Engineering & Sci

“…In the past, the effects of various parameters in grafting polymerization onto biopolymers have been investigated to form corresponding radical on the chain . Those investigations consist of applying varied sort of vinyl monomers such as butyl acrylate , ethyl acrylate (EA) , methyl acrylate , acrylonitrile , meth acrylonitrile , and methyl methacrylate (MMA) , applying different dosage of initiators . Also, the graft performance has been attempted to be optimized, based on the reaction parameters such as time, temperature, and monomer feed ratio.…”

Section: Introductionmentioning

confidence: 99%

One‐pot approach synthesizing and characterization of random copolymerization of ethyl acrylate‐co‐methyl methacrylate with broad range of glass transition temperature onto collagen

Bazrafshan

Stylios

2017

Collagen is a natural polymer that cannot be applied freely to specific end uses due to its inherent drawbacks. Grafting polymerization of methyl methacrylate‐co‐ethyl acrylate was applied to modify the surface of acid soluble collagen (ASC). The main objective of this work is not only reducing the hydrophilic behavior of collagen on which has been concentrated so far but also successfully showed that the introduced co‐monomers onto ASC can alter the thermal behavior of the resulted copolymer. The level of branched copolymer significantly influenced the initial viscosity in studied co‐monomer feed ratios. The graft polymerization of collagen demonstrated the meaningful change in conductivity value of branched copolymer, where the copolymer in side chain with low dielectric constant covalently bonded onto the ASC. The increase in the co‐monomer feed ratio had no significant effect on conductivity value of copolymer, afterwards. The novelty of this work was determined to achieve the new copolymer onto the backbone of collagen to be used in specific thermally stabled end uses that the sufficient chain entanglements improve the flexibility of final product. POLYM. ENG. SCI., 58:1261–1267, 2018. © 2017 Society of Plastics Engineers