Radiation chemistry of polymers

Kabanov, V.Ya.; Feldman, Vladimir I.; Ершов, Б. Г.; Polikarpov, A. I.; Kiryukhin, D. P.; Apel, P.Yu.

doi:10.1134/s0018143909010019

Cited by 34 publications

(13 citation statements)

References 31 publications

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“…The formation of radicals during irradiation of polysaccharides not simply occurs via the cleavage of the glycoside bond, but it is also accompanied by the degradation of the glucopyranose unit, resulting in the formation of CO 2 and CO molecules and polymer compounds with carbonyl or carboxyl end groups . Although no bands typical for carboxyl or carbonyl groups could be detected in our recorded FTIR spectra, it might be viable the formation of a negligible amount of such functional groups.…”

Section: Resultsmentioning

confidence: 75%

Degradation of amylose by ionizing radiation processing

Nemţanu

Braşoveanu

2016

Starch Stärke

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The current study brings to light new aspects of degradation of polysaccharides by physical methods, namely degradation of amylose exposed in the solid state to the accelerated electron beam, in the presence of oxygen, in the range of 10-50 kGy. Effects of irradiation on amylose were investigated by gel-permeation chromatography, Fourier transform infrared spectroscopy, and scanning electron microscopy. In order to evaluate quantitatively, the radiation degradation of amylose, radiochemical yield of degradation, degradation rate constant, and half value dose of molecular weights were determined. The results indicated the main-chain scission of amylose, which led to the reduction of its molecular weight and molecular weight distribution. Changes of amylose spectral features related to the frequency and intensity of some bands indicated an alteration of the structural integrity induced by the electron beam. The scanning electron micrographs revealed the appearance of smaller fragments by amylose structure disruption as a result of irradiation. Consequently, degradation of amylose in the solid state can effectively be controlled by electron beam irradiation. This novel study may be a useful starting point for preparation or processing of amylose-based matrices by using electron beam treatment.

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Section: Resultsmentioning

confidence: 75%

Degradation of amylose by ionizing radiation processing

Nemţanu

Braşoveanu

2016

Starch Stärke

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“…Polimer yang diimplantasi ion nitrogen memiliki perubahan sifat elektrik yang ditandai dengan meningkatnya nilai permitivitas bahan dielektrik (ɛ) yang sebanding dengan nilai kapasitansi [19,20]. Sedangkan penurunan nilai kapasitansi saat diimplantasi dengan ion hingga mencapai orde 10 16 ion/cm 2 menunjukkan bahwa struktur molekul ion mengalami kerusakan dengan area dan tingkat kedalaman yang lebih besar sehingga bersifat lebih konduktif dengan ditandai mulai berkurangnya nilai kapasitansi [21,22].…”

Section: Kapasitansi Dan Faktor Disipasiunclassified

Pengaruh Dosis Implantasi Ion Nitrogen Pada Sifat Kapasitasi Polimer PVDF Dan PVDF-HFP

Hudayawan

Darsono²,

Kusuma

2018

gnd

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Material berdensitas energi elektrik tinggi sebagai bahan dielektrik kapasitor sangat diperlukan dalam industri bidang elektronika. Tujuan penelitian ini ialah mengkarakterisasi dan menganalisis polimer PVDF( Poly vinylidene fluorde) dan PVDF-HFP (Poly vinylidene fluoride-co-hexafluoropropene) sebelum dan sesudah diimplan ion nitrogen. Metode penelitian yang dilakukan ialah menyiapkan sampel lapisan tipis Polimer PVDFdan PVDF-HFP kemudian diimplan menggunakan ion nitrogen pada dosis 4,69 x 1016 ion/cm2 hingga 1,41 x 1018 ion/cm2 pada energi 10 keV. Selanjutnya nilai kapasitansi, faktor disipasi dan kekuatan dielektrik sampel dikarakterisasi menggunakan LCR meter GW-Instek 800. Morfologi dan ikatan struktur dari sampel dikarakterisasi menggunakan SEM dan FTIR. Hasil percobaan menunjukkan bahwa terjadi peningkatan nilai kapasitansi sebesar 4,3 kali pada polimer PVDF dan 1,4 kali pada polimer PVDF-HPF. Peningkatan nilai kapasitansi disebabkan bertambahnya ikatan rangkap C=C pada PVDF dan PVDF-HFP yang diimplan ion nitrogen. Hal tersebut dibuktikan dari hasil karakterisasi FTIR dan SEM. Namun demikian nilai kekuatan dielektrik mengalami penurunan akibat semakin konduktifnya polimer PVDF dan PVDF-HPF. Untuk sampel PVDF ada kapasitansi optimum dicapai pada dosis 9,38 x 1017 ion/cm2 sedangkan untuk sampel PVDF-HFP diatas dosis tersebut memperlihatkan gejala saturasi. Nilai kapasitansi optimal diperoleh berturut-turut sebesar 0,089483 nF, faktor disipasi 0,129613 % pada polimer PVDF dan 0,134889 nF, faktor disipasi 0,09784 % untuk polimer PVDF-HFP.

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“…This kind of technique has diverse advantages since this not require an initiator, high temperature, and it is possible to control some variables such as cross‐linking degree without the use of any cross‐linking agent or additional reagent. These characteristics made this method particularly appropriate to synthesize a wide variety of new materials, 10,11 avoiding remaining toxic agents, and obtain copolymeric films sterilized for biomedical tests 6,12 …”

Section: Introductionmentioning

confidence: 99%

Improving thermo‐responsive hydrogel films by gamma rays and loading of Cu and Ag nanoparticles

López-Barriguete

Flores-Rojas

López‐Saucedo

et al. 2020

J of Applied Polymer Sci

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This paper presents two modified copolymeric hydrogel films with thermo‐responsiveness. The final films are hydrogels containing N‐isopropylacrylamide, N‐N‐dimethylacrylamide, methyl methacrylate, and ethoxyethyl methacrylate. The incorporation of Ag and Cu in the smart hydrogel films endowed them with specific properties that could be useful in developing biological sensors, smart membranes, or flexible electronic components, which are proper for design and improvement on technology and biomedical applications. The films were synthesized in solution by gamma radiation at a dose rate of 10 kGy h−1, and an absorbed dose of 50 kGy. The characterization was realized by different spectroscopic and microscopic techniques as FTIR‐ATR, atomic force microscopy, SEM–EDX, TGA, and DSC. The hydrogel films were grafted with glycidyl methacrylate showing high resistance, biocompatibility, adequate adaptability, flexibility, in addition to the capacity of metal doping with silver and copper.

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Radiation chemistry of polymers

Cited by 34 publications

References 31 publications

Degradation of amylose by ionizing radiation processing

Degradation of amylose by ionizing radiation processing

Pengaruh Dosis Implantasi Ion Nitrogen Pada Sifat Kapasitasi Polimer PVDF Dan PVDF-HFP

Improving thermo‐responsive hydrogel films by gamma rays and loading of Cu and Ag nanoparticles

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