Synthesis And Characterization Of Graft copolymers Of Methacrylic Acid Onto Gelatinized potato Starch Using Chromic Acid Initiator In Presence Of Air

Effect of some parameters on the synthesis and the physico-chemical properties of new amphiphilic starch-g-copolymers

“…This signal was shifted to lower temperatures as compared to potato starch. Probably, it was due to the losing of crystalline structure of starch during gelation and grafting and thus forming amorphous copolymer (Pathania & Sharma, 2012;Singh, Tiwari, Pandey, & Sigh, 2006). In addition, lower degradation temperature of graft copolymers may also be due to the partial degradation of starch during grafting process which causes the formation of starch fragments and thus copolymers with lower polymerization degree.…”

“…where W e is the final weight of the sample and W i is the initial weight of the sample (Pathania & Sharma, 2012). 2.6.5.…”

Swelling, mechanical and mucoadhesion properties of Mt/starch-g-PMAA nanocomposite hydrogels

“…Firstly, to realize the gelatinization of starch, a slurry mixture of 4 g starch and 200 mL deionized water was heated by constantly stirring at 85 ± 1°C for 0.5 h under nitrogen atmosphere and then the slurry was cooled to 30°C (Knill and Kennedy, 2005). To initiate the grafting reaction by producing free radicals on the starch backbone, ammonium cerium-IV-nitrate-HNO 3 initiator system was added in the slurry and stirred for 10 min (Athawale and Lele, 1998;Athawale and Rathi, 1999;Pathania and Sharma, 2012;Ismail et al, 2013). Afterwards, calculated amounts of MAA and Mt were added, and the mixture was vigorously stirred at 30 ± 1°C for 3 h under nitrogen atmosphere.…”

“…The grafting of the pH-sensitive monomers such as acrylic and methacrylic acid onto starch could result in combined properties such as, biocompatibility, nontoxicity, and higher bioadhesion depending on the hydrogel composition (Moroa, 2001;L.-M. Zhang et al, 2005;Yan et al, 2005;Bravo-Osuna et al, 2008;Pourjavadi et al, 2008;El-Hag Ali and AlArifi, 2009;Saboktakin et al, 2009;Casas et al, 2010;Mahkam, 2010;Maiti et al, 2010;Liu et al, 2011;Saboktakin et al, 2011;Shalviri et al, 2012). There are numerous papers devoted to synthesis, characterization and applications of grafted starch based hydrogels with different structures and properties (Burr et al, 1975;Misra et al, 1980;Hebeish et al, 1988Hebeish et al, , 1998Vazquez et al, 1989;Khalil et al, 1990Khalil et al, , 1993Mostafa, 1995;Abdel-Hafiz, 1997;Athawale and Rathi, 1997;Athawale and Lele, 1998;Moroa, 2001;Aravindakshan and Kumar, 2002;Beliakova et al, 2004;Geresh et al, 2004;Yan et al, 2005;Pourjavadi et al, 2008;Zhang and Zhou, 2008;El-Hag Ali and AlArifi, 2009;Liu et al, 2009;Marinich et al, 2009;Casas et al, 2010;Mostafa et al, 2011;Pathania and Sharma, 2012;Ismai...…”

Starch-g-poly(benzyl methacrylate) copolymers

“…In a typical procedure, ca. 100 mg of obtained copolymers were placed in an exsiccator and exposed to the water vapor at 25°C for 24 h. Percent moisture absorbance was calculated according to equation presented below [32]:…”