Molecular weight changes induced in an anionic polydimethylsiloxane by gamma irradiation in vacuum

Satti, Angel José; Andreucetti, Noemí A.; Ciolino, Andrés Eduardo; Vitale, Cristian; Sarmoria, Claudia; Vallés, Enrique M.

doi:10.1016/j.radphyschem.2010.07.003

Cited by 12 publications

(8 citation statements)

References 18 publications

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“…The V 4 containing copolymers were also exposed to gamma radiation in vacuum to compare the effects of cross‐linking obtained in these copolymers with those achieved on a model PDMS homopolymer 12. The data obtained with SEC and gel extraction are shown in Table II.…”

Section: Resultsmentioning

confidence: 99%

“…This homopolymer was synthesized and irradiated in similar conditions to those reported for the copolymers synthesized in this article. For more details, see Ref 12…”

Section: Methodsmentioning

confidence: 99%

“…In addition, the gamma radiation effects over the synthesized materials were studied. To do this, samples of the obtained copolymers were irradiated with gamma rays and compared with irradiated samples of model PDMS (PDMS 0) 12. We hope that the results reported in this work will contribute to the knowledge of the controlled V 4 polymerization reaction, as well as the understanding of the gamma radiation effects over V 4 containing polymers.…”

Section: Introductionmentioning

confidence: 92%

“…To improve the applications of PDMS‐based polymers, several modification methods are employed such as cross‐linking by hydrosilylation7 and physicochemical modification using high‐energy radiation 8–12. These methods are favored by the presence of carbon–carbon double bonds, and it would be desirable to obtain a PDMS‐based polymer having a controlled amount of them in its structure.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

“…This homopolymer was synthesized and irradiated in similar conditions to those reported for the copolymers synthesized in this article. For more details, see Ref 12…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…scissioning happens in the polymer, the main Si-O-Si chain brakes, functional groups split and the volatile products (e.g. H2, CH4 and C2H6 gases) leave the irradiated volume [20,21]. As a result of these processes, PDMS shrinks at the place of irradiation and the initially elastic polymer becomes a rigid, brittle and glass-like material [15].…”

Section: Introductionmentioning

confidence: 99%

Selective etching of PDMS: Etching technique for application as a positive tone resist

Szilasi

Cserháti

2018

Applied Surface Science

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Prediction of molecular weight distributions in polymers using probability generating functions

2011

Self Cite

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We review the work of our group in the area of mathematical modelling of polymerisation reactors and processes, with emphasis in the prediction of molecular weight distributions using probability generating functions (pgfs). We apply the method to a polymerisation example for which the analytic solution is known, and show that its predictions are very accurate. We also compare the performance of the method to that of the straightforward integration of the mass balances of the reacting system, showing that the pgf method results in very fast calculations. We end by discussing ongoing and future applications of the method. © 2011 Canadian Society for Chemical Engineering

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Molecular weight changes induced in an anionic polydimethylsiloxane by gamma irradiation in vacuum

Cited by 12 publications

References 18 publications

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

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

Selective etching of PDMS: Etching technique for application as a positive tone resist

Prediction of molecular weight distributions in polymers using probability generating functions

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