Stabilization of γ-sterilized biomedical polyolefins by synergistic mixtures of oligomeric stabilizers

Alariqi, Sameh A. S.; Kumar, Anil; Rao, B. Sanjeeva; Tevtia, Amit K.; Singh, R. P.

doi:10.1016/j.polymdegradstab.2006.03.010

Cited by 26 publications

(22 citation statements)

References 18 publications

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“…CX] shows the antagonistic effect of stabilization, while addition of 'S' to 'CX' and 'CTX' improves the polymer resistance against degradation. The phenol and phenol-free systems have shown increased stability against tensile breakage after c-sterilization and it is supporting the trend observed in iPP and EP matrices [20][21][22]. For example, the elongation at break (%) of antagonistic mixtures (i.e.…”

Section: Phenol Systemssupporting

confidence: 75%

“…The significant reduction in yellowing after addition organo-phosphite (S) to CX and CTX can be attributed to the fact that organo-phosphite decomposes the hydroperoxides to reduce further oxidation and their reaction with oxidized products of hindered phenol, i.e. highly colored quinonoids which are transformed into colorless benzenoid forms [20][21][22]34]. In contrast to tensile property, where the combination of oligomeric HAS stabilizer 'C' and hindered phenol 'X' (i.e.…”

Section: Yellowness Index (Yi)mentioning

confidence: 99%

“…However, the antagonistic effect of stabilization was found in the binary (1:1) phenol-free system (oligomeric HAS-tert-HAS). Stabilization and synergistic mechanisms as well as the reactivity of the products resulted due to the combination of those stabilizers have been discussed in our previous work [20][21][22]. Since the stabilizer blend systems we tested are still new (especially with c-irradiation), there are no clear data on the toxicity of the formed products.…”

Section: Introductionmentioning

confidence: 99%

“…The consumption and loss of the stabilizers accelerate the aging of the polymer more than thermal-or radio-or photo-oxidation [17,18]. The long-term protection was observed with oligomeric HAS stabilizer, whereas very short-time protection was found with low-molecular weight HAS [19][20][21][22]. Polymeric hindered amine light stabilizers (HALS) shows a much higher thermal stability and better extraction resistance than that of low molecular weight; thus, the tendency for developing amine stabilizers in the form of oligomeric/polymeric macromolecules recently established [23,24].…”

Section: Introductionmentioning

confidence: 99%

“…Considering the above said aspects, we have found the combinations of synergistic mixtures of oligomeric stabilizers in our previous works [20][21][22] where we have used mixtures of oligomeric HAS and tert-HAS, primary and secondary antioxidants, which are approved for food contact applications [30], and their selection has been based on different molecular weights and protecting mechanisms in iPP and EP matrices. The previous work aimed to comprise heterosynergistic combinations of these stabilizers to be an alternative stabilization system of the phenolic antioxidants as well as to improve the discoloration of the phenolic system.…”

Section: Introductionmentioning

confidence: 99%

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Stabilization of γ-sterilized low-density polyethylene by synergistic mixtures of food-contact approval stabilizers

et al. 2017

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In our previous studies, we have found the synergistic combinations of stabilizers which follow different mechanisms of stabilization and are approved for food contact applications. The present attempt is to test the potentials of those systems in stabilizing c-sterilized lowdensity polyethylene (LDPE). The results were discussed by comparing the stabilizing efficiency of mixtures with and without phenol systems as well as with their counterparts of isotactic polypropylene (iPP) and ethylene-propylene copolymers (EP) matrices. LDPE has been melt-mixed with tertiary hindered amine stabilizer (tert-HAS), oligomeric HAS stabilizer, phenolic and organo-phosphite antioxidants and subjected to c-sterilization. Stabilization in terms of changes in oxidation products, tensile properties, yellowing and surface morphology was evaluated by FT-IR spectroscopy, Instron, colorimetry, and scanning electron microscopy (SEM), respectively. The results of the present study confirm the validity of those systems for protecting various polyolefins against c-sterilization. The results showed that the synergism, antagonism and the trend in stabilization efficiency of the binary, ternary and quaternary stabilizer systems were almost similar in LDPE, iPP and EP matrices. The binary system of oligomeric HAS and tert-HAS has shown the antagonistic effect of stabilization, whereas their combination with organophosphite has exhibited synergistic effect even at higher doses of c-sterilization. The combination of oligomeric HAS, tert-HAS, organo-phosphite and hindered phenol exhibited improved stabilization efficiency than single or binary additive systems. The phenol systems have shown long term of stability than that of phenol-free systems. It was found that the consumption of oligomeric stabilizer significantly depends on the components of stabilization mixture. It was concluded that the stability of polyolefins (LDPE, iPP and EP) against c-sterilization can be achieved by blends of different stabilizers which are approved for food contact applications.

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Section: Phenol Systemssupporting

confidence: 75%

Section: Yellowness Index (Yi)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stabilization of γ-sterilized low-density polyethylene by synergistic mixtures of food-contact approval stabilizers

et al. 2017

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Aging and Biodegradation of Biocomposites

Mary¹,

Pillai²,

Amma³

et al. 2013

Handbook of Biopolymer‐Based Materials

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Emerging Chemistry in Enhancing the Chemical and Photochemical Stabilities of Fused‐Ring Electron Acceptors in Organic Solar Cells

Liu

et al. 2021

Adv Funct Materials

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The power conversion efficiency of organic solar cells (OSCs) has made exceptionally rapid progress in the past five years owing to the emergence of fused-ring electron acceptors (FREAs). To achieve the commercialization, it is urgent to resolve the stability issues of OCSs from materials to devices. In particular, the state-of-the-art FREAs, often synthesized by Knoevenagel condensation, generally contain two exocyclic vinyl groups (CC bond) as the conjugated bridges, which inevitably exhibit an obvious electron-deficient characteristic due to the strong push-pull electronic effect. As a result, these vinyl bridges are vulnerable to nucleophile attacking and/or photooxidation, leading to poor chemical and photochemical stabilities of FREAs that easily cause the degradation of device performance. In this perspective, an in-depth understanding of the degradation mechanism of FREAs is provided, and then effective strategies reported recently are reviewed for improving the chemical and photochemical stabilities of FREAs from interfacial engineering to molecular engineering to additive engineering. Finally, a conclusion and outlook for the future design of highly efficient and stable FREAs are also presented.

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Stabilization of γ-sterilized biomedical polyolefins by synergistic mixtures of oligomeric stabilizers

Cited by 26 publications

References 18 publications

Stabilization of γ-sterilized low-density polyethylene by synergistic mixtures of food-contact approval stabilizers

Stabilization of γ-sterilized low-density polyethylene by synergistic mixtures of food-contact approval stabilizers

Aging and Biodegradation of Biocomposites

Emerging Chemistry in Enhancing the Chemical and Photochemical Stabilities of Fused‐Ring Electron Acceptors in Organic Solar Cells

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