Influence of a hindered amine stabilizer on optical and mechanical properties of poly(methyl methacrylate) exposed to gamma irradiation

Aquino, Kátia Aparecida da Silva; Araújo, Elmo S.; Guedes, S.M.L.

doi:10.1002/app.31544

Cited by 7 publications

(2 citation statements)

References 15 publications

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“…After 63 days of storage at 30 kGy dose, the yellowness index measured was 2.78 and 0.17 to PMMA-control and PMMA-622, respectively. These results showed that the Tinuvin 622 is a good alternative for stabilizing the PMMA against gamma irradiation damage in sterilization processes with low cost (Aquino et al, 2010) The scheme in Figure 13 is generally accepted to explain the aspects of the chemistry mechanism of HALS action to inhibit polymer photo-oxidation. This scheme was used to guide a strategy to assess Tinuvin 622 action in radiolytic stabilization of PMMA (Aquino & Araujo, 2008).…”

Section: Action Of Stabilizers In Polymeric Medical Device Exposed Tomentioning

confidence: 91%

“…Thus the nitroxyl radicals could regenerate many times through the chain reaction before their depletion. The single Electron Spin Resonance (ESR) spectrum was obtained for Tinuvin 622 sample irradiated at 100 kGy and was attributed to nitroxyl radical (Aquino et al, 2010). The chemistry of HALS had been widely documented for UV irradiation.…”

Section: Action Of Stabilizers In Polymeric Medical Device Exposed Tomentioning

confidence: 99%

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Sterilization by Gamma Irradiation

Aquino¹

2012

Gamma Radiation

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Section: Action Of Stabilizers In Polymeric Medical Device Exposed Tomentioning

confidence: 91%

Section: Action Of Stabilizers In Polymeric Medical Device Exposed Tomentioning

confidence: 99%

Sterilization by Gamma Irradiation

Aquino¹

2012

Gamma Radiation

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Influence of UV stabilizers on the weathering of PETG and PCTT films

Arangdad

Yıldırım

Detwiler

et al. 2019

J of Applied Polymer Sci

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The influence of two UV photostabilizers on the photostability of Polyethylene-co-CHDM-terephthalate (PETG) and Polycyclohexylenedimethylene-Co-TMCD-terephthalate (PCTT) copolyester films was investigated. Untreated films and films containing stabilizer were irradiated. The resulting films were analyzed by attenuated total reflectance Fourier transform infrared (ATR FTIR) spectroscopy, gel permeation chromatography (GPC), and X-ray photoelectron spectroscopy (XPS). FTIR spectra of the irradiated films containing Cyasorb 1164 showed less change in intensity of the broad peak corresponding to OH groups, than the films containing Cyasorb 3638, indicating that Cyasorb 1164 is a better photostabilizer for these films. XPS results showed that the decrease in C/O ratio, due to photodegradation, was greater in films containing Cyasorb 3638 compared to those containing Cyasorb 1164. The formation of degradation products was evident from emission spectra arising from extracts of irradiated films based on PCTT +10% Cyasorb 3638, but no degradation products were apparent in extracts from irradiated PCTT +10% Cyasorb 1164. UV-absorption spectra of Cyasorb 1164 overlap more substantially with the absorption spectra of PETG and PCTT. The results from FTIR, XPS, and GPC analyses of the irradiated PETG and PCTT films demonstrated that Cyasorb 1164 was more effective than Cyasorb 3638 in enhancing resistance to UV-induced weathering.

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Effects of radiation type and dose on the properties of selected polymers

Burgstaller¹,

Höftberger²,

Gallnböck-Wagner³

et al. 2020

Polymer Engineering & Sci

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Using ionizing radiation to sterilize medical and health care products is a widespread and well established approach, as products can be treated in their final shipping container without any residuals. During irradiation, the product materials will undergo some changes due to the absorbed energy, which have to be assessed during product qualification in order to specify a maximum allowable dose for the product. However, there is a lack of a systematic approach studying polymers in regard to dose ranges encountered and all types of ionizing radiation. Therefore, the aim of this work was to investigate the influence of radiation dose and source on the resulting properties of various polymers, which were already brought into final shape via injection molding, and to compare these effects found in the mechanical and rheological properties as well as their appearance. We found, that the mechanical properties of most investigated polymers are not influenced, except for polypropylene, but that yellowing was a pronounced effect in all the cases. The differences in polymer properties due to the radiation sources are small, only some materials exhibit more degradation by gamma irradiation due to the lower dose rate applied in comparison to x‐ray and e‐beam irradiation.

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Influence of a hindered amine stabilizer on optical and mechanical properties of poly(methyl methacrylate) exposed to gamma irradiation

Cited by 7 publications

References 15 publications

Sterilization by Gamma Irradiation

Sterilization by Gamma Irradiation

Influence of UV stabilizers on the weathering of PETG and PCTT films

Effects of radiation type and dose on the properties of selected polymers

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