Modelling molecular weight changes induced in polydimethylsiloxane by gamma and electron beam irradiation

Satti, Angel José; Andreucetti, Noemí A.; Ressia, Jorge Aníbal; Vallat, Marie F.; Sarmoria, Claudia; Vallés, Enrique M.

doi:10.1016/j.eurpolymj.2008.02.017

Cited by 27 publications

(26 citation statements)

References 13 publications

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“…The M c values of the composite films crosslinked with EB irradiation of 600 kGy were evaluated to be *1300 g/mol, which was lower than those (*2000 g/mol) of the composites crosslinked with 400 kGy dose. It supports that during the EB irradiation, the crosslinking reaction was much dominant over the chain scission [10]. On the other hand, the MWCNT content was found to have no significant influence on the M c values for EB-crosslinked composite films, within the experimental error.…”

Section: Structural Characterizationsupporting

confidence: 67%

“…Satti et al reported that for the EBirradiated PDMS, crosslinking predominates over chain scission reactions, and if at air atmosphere condition, the oxygen diffusing into PDMS may react with some of the radio-induced free radicals, producing inactive species [10]. Frounchi et al reported that, for silicone rubber by EB irradiation over a dose range of 50-300 kGy in the absence of chemical reagents, the tensile strength, hardness, modulus, and elongation were even higher than those of peroxide-crosslinked silicone rubber [8].…”

Section: Introductionmentioning

confidence: 98%

“…The EB irradiation was also applied for the structural and property modifications of polydimethylsiloxane (PDMS) [8,10,16]. Satti et al reported that for the EBirradiated PDMS, crosslinking predominates over chain scission reactions, and if at air atmosphere condition, the oxygen diffusing into PDMS may react with some of the radio-induced free radicals, producing inactive species [10].…”

Section: Introductionmentioning

confidence: 99%

“…The EB irradiation may induce crosslinking or chain scission on polymeric materials. In case that the crosslinking reaction is dominant during the EB irradiation, high EB energy induces the formation of macroradicals from polymeric backbones and the radicals recombine by producing 3 dimensionally crosslinked polymer network [10]. When polymers are crosslinked, the chain mobility is severely impeded, making the polymer stable against heat.…”

Section: Introductionmentioning

confidence: 99%

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Thermomechanical and electrical properties of PDMS/MWCNT composite films crosslinked by electron beam irradiation

2015

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Electron beam (EB)-crosslinked flexible polydimethylsiloxane (PDMS) composite films containing 1.0-3.0 wt% pristine MWCNT were manufactured, and their structures, thermomechanical, and electrical properties were systematically investigated for applications as electric heating materials. The crosslinking extent of PDMS/MWCNT composite films was found to increase with the EB irradiation dose of 200-600 kGy, irrespective of the MWCNT content. Raman spectra showed that I D /I G values (0.97-1.02) for the EB-crosslinked composite films were lower than those of pristine and EB-irradiated MWCNTs (1.07-1.17), demonstrating the possibility of the chemical interaction between MWCNT and PDMS in the composite films. Dynamic mechanical thermal data revealed that the EB-crosslinked composite films possessed flexible features in a wide range of temperatures, although the storage moduli increased slightly with the increment of the MWCNT content. The electrical resistivity and electric heating behavior of the composite films, which were thermally stable up to *200°C, were strongly dependent on the MWCNT content as well as applied voltage. For instance, the composite film with 2.0 wt% MWCNT achieved a steady-state maximum temperature of *150°C at a relatively low voltage of 35 V and it also maintained stable and reproducible electric heating performance under stepwise cyclic voltage changes for a long period of time.

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Section: Structural Characterizationsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermomechanical and electrical properties of PDMS/MWCNT composite films crosslinked by electron beam irradiation

2015

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“…9,10 It was reported that polysiloxanes are crosslinked upon exposure to high energy radiation via a radical mechanism. [11][12][13][14] Recently Xiao et al studied the optical degradation of PDMS under exposure of 150 keV protons to reveal the damage behavior of organic silicone in space. 15 Recently we reported enhanced photoluminescence of PDMS and PDMS-DND composite samples 16 induced by high energy proton irradiation which can be the basis for determining radiation exposure and dose.…”

Section: Introductionmentioning

confidence: 99%

Influence of proton irradiation on the structure and stability of poly(dimethylsiloxane) and poly(dimethylsiloxane)-nanodiamond composite

Borjanović¹,

Bistričić

Власов

et al. 2009

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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In the present study, pure poly(dimethylsiloxane) (PDMS) polymer and PDMS-detonation nanodiamond (PDMS-DND) composite with 1wt.% of DND were irradiated under vacuum at room temperature with a 2MeV proton beam with fluences in the 1013–1015cm−2 range. Modification of the structures and properties of the pure polymer and the nanocomposite material were monitored as a function of proton fluence. Specifically, the vibrational dynamics of pure PDMS and PDMS-DND nanocomposites, both unirradiated and irradiated samples, were investigated using Raman and Fourier transform infrared spectroscopy (FTIR). The Raman and FTIR spectra of the PDMS and PDMS-DND composites exhibit an overall reduction in intensity of all vibrational bands of the irradiated samples. The changes in relative intensities of the characteristic vibrational bands as a function of irradiation fluence indicate that cleavage of the backbone (Si–O–Si) PDMS chains was most pronounced. Importantly, structural degradation of PDMS-DND composites takes place at an order of magnitude higher fluence than for pure PDMS, indicating the potential of using DND-based polymer composites for application in high radiation environments. The appearance of strong photoluminescence following irradiation was more pronounced for PDMS-DND composites as compared to pure PDMS.

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Synthesis, characterization, and gamma radiation effects over well‐defined poly(vinylsiloxanes) copolymers

Satti

Nador

Vitale

et al. 2011

J of Applied Polymer Sci

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Anionic ring-opening polymerization (AROP) was employed for the controlled synthesis of linear model block copolymers of 1,3,5,7-tetrametil-1,3,5,7-tetravinyl(cyclotetrasiloxane) (V 4 ) and 1,3,5-dimethyl(cyclotrisiloxane) (D 3 ) monomers by using sec-butyl lithium (sec-Bu À Li þ ) as initiator, and high-vacuum anionic polymerization techniques. V 4 copolymerization was promoted by employing D 3 and sec-Bu À Li þ producing living silanolates that open the stable V 4 ring. For this purpose, two strategies were applied: (a) sequential addition of monomers, and (b) onestep copolymerization at different reaction temperatures. According to the experimental results, higher levels of V 4 incorporation ($ 18.14 mol %) were obtained by mixing both co-monomers and performing the reaction at high temperature (80 C). This strategy allowed the control of the V 4 incorporation into the copolymer structure, giving the opportunity of synthesizing model vinyl-siloxane polymers. The gamma radiation of these materials showed that lower doses are needed to achieve the same gel content as in a model poly(dimethylsiloxane) (PDMS). In such a sense, these results constitute one of the first reports regarding the effect of gamma radiation on vinyl-containing silicon polymers, and may be of fundamental importance if a biomedical cross-linked rubber-type PDMS is needed at earlier doses of sterilization.

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Modelling molecular weight changes induced in polydimethylsiloxane by gamma and electron beam irradiation

Cited by 27 publications

References 13 publications

Thermomechanical and electrical properties of PDMS/MWCNT composite films crosslinked by electron beam irradiation

Thermomechanical and electrical properties of PDMS/MWCNT composite films crosslinked by electron beam irradiation

Influence of proton irradiation on the structure and stability of poly(dimethylsiloxane) and poly(dimethylsiloxane)-nanodiamond composite

Synthesis, characterization, and gamma radiation effects over well‐defined poly(vinylsiloxanes) copolymers

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