Role and relevance of polarity and solubility of vinyl monomers in graft polymerization onto starch

Athawale, Vilas D.; Rathi, S. C.

doi:10.1016/s1381-5148(97)00016-3

Cited by 46 publications

(37 citation statements)

References 12 publications

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“…The purified copolymers were washed with methanol and dried to a constant mass at 60°C [28]. The grafting parameters such as the grafting efficiency (GE/%) and the grafting percent (G/%) were evaluated using the following equations according [29,30]: …”

Section: Synthesis Of Starch-g-copolymersmentioning

confidence: 99%

Starch-g-poly(benzyl methacrylate) copolymers

Worzakowska

2016

J Therm Anal Calorim

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The physicochemical properties such as swelling in polar and non-polar solvents, moisture resistance, chemical resistance, ability for gelatinization and the thermal properties along with the evolution of volatile decomposition products of some starch-g-copolymers obtained through the grafting of benzyl methacrylate monomer onto potato starch have been studied. The chemical structure of copolymers was confirmed using ATR-FTIR analysis. The prepared materials were characterized by completely different properties than unmodified potato starch due to the covalent bonding of poly(benzyl methacrylate) chains onto starch backbone. The copolymers were not able to gelate; however, they exhibited higher swelling in non-polar solvents, lower swelling in polar solvents and higher resistance toward moisture, acid and base conditions than unmodified potato starch. In addition, DSC analysis showed that T g of copolymers was shifted to a little higher values as compared to T g of poly(benzyl methacrylate). The thermal stabilities of copolymers and potato starch were comparable. Their decomposition took place in two main stages connected with the emission of various volatile decomposition products (CO 2 , CO, H 2 O, CH 4 , aldehydes, alcohols, furan derivatives, acids, benzyl methacrylate) in inert atmosphere as it was confirmed based on the simultaneous TG/DSC/ FTIR analysis.

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Section: Synthesis Of Starch-g-copolymersmentioning

confidence: 99%

Starch-g-poly(benzyl methacrylate) copolymers

Worzakowska

2016

J Therm Anal Calorim

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“…Then, the copolymers were isolated from the homopolymers by the purification in CHCl 3 and THF, filtered and dried at 60°C to the constant mass [27][28][29]. The applied grafting parameters allowed obtaining the copolymers with different grafting percent (%G), as given in Table 1, counted using the following equation [32,33]:…”

Section: Graft Copolymerizationmentioning

confidence: 99%

The effect of starch-g-copolymers structure on the oxidative behavior studied by the TG/DSC/FTIR-coupled method

Worzakowska

2017

J Therm Anal Calorim

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The effect of starch-g-copolymers structure on the thermal decomposition course under oxidative conditions by using the simultaneous TG/DSC/FTIR technique has been investigated. To those studies, two types of starch-g-copolymers obtained under the graft copolymerization process of aromatic acrylate monomers such as phenyl acrylate and benzyl acrylate onto starch have been chosen. The TG/DSC investigations confirmed that the course of the decomposition process of all studied copolymers under the heating and in the presence of air was similar and run through three large stages. TG/FTIR studies indicated on the same decomposition mechanism under the first decomposition stage, however, on the completely different decomposition mechanism under the second decomposition stage of the copolymers which was directly dependent on the structure of grafted polymer. In addition, it was also proved that the percent grafting of the copolymers has not influenced on its decomposition course and its decomposition mechanism. The grafting percent influenced only on the Dm in each decomposition stage and on the intensity in the emission of the volatile species.

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“…... (3) The coefficient K is the equilibrium constant, k p , k d , and k t are the rate constants for propagation, alginate-APS dissociation, and termination reactions, respectively [11][12][13] . Therefore, we preliminarily conclude that the APS-initiated grafting of acrylamide (AAm) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) onto alginate is also fitted with this kind of rate statement(16-18).The overall activation energy (Ea) of the graft polymerization reaction was calculated by using of the Eq.…”

Section: Synthesis Mechanism and Reaction Ratementioning

confidence: 99%