Lifetime prediction for HALS-stabilized LDPE and PP

Malík, J.; Tuan, D.Q.; Špirk, E.

doi:10.1016/0141-3910(94)00098-s

Cited by 39 publications

(22 citation statements)

References 14 publications

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“…Billingham and Calvert 2) proposed a theoretical model for predicting the lifetime of polymers on the basis of additive volatility, solubility, diffusion rate, and the critical stabilizer concentration. The studies of Malík et al 10) revealed good agreement between this theoretical model and the data determined experimentally by accelerated weathering of poly(propylene) (PP) and LDPE stabilized with HALS. The stabilizing effectiveness is influenced by the molecular mass of the antioxidant.…”

Section: Solubilitysupporting

confidence: 60%

Study of the effects influencing additive migration in polymers

Földes

1998

Angew. Makromol. Chem.

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Section: Solubilitysupporting

confidence: 60%

Study of the effects influencing additive migration in polymers

Földes

1998

Angew. Makromol. Chem.

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“…g COu k 1u ½POOH þg COb k 1b ½POOH 2 (10) g COu and g COb being the carbonyl yields of respectively uni-and bimolecular POOH decomposition taken equal to 1 from previous study [43]. (1 À x C ) term is included to take into account the fact that oxidation possibly occurs only in amorphous phase.…”

Section: Resultsmentioning

confidence: 99%

“…-The well-known important role of transport phenomena in stabilizer performance [10,11]. -The high complexity of stabilization mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Polypropylene stabilization by hindered phenols – Kinetic aspects

Richaud

Fayolle

Verdú

2011

Polymer Degradation and Stability

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“…The effectiveness of particular HALS as stabilising agents can be attributed to their ability to itself including resin systems, pigment components, curing temperatures and the degree of 527" degradation experienced [12,36,[39][40][41]. In order to optimise HALS compounds, particularly 528" for use in coil coatings, understanding the molecular changes that may occur in situ leading to …”

Section: "mentioning

confidence: 99%

“…This in turn has implications for their activation and performance under subsequent in-service conditions. [12,36,[39][40][41]. In order to optimise HALS compounds, particularly 528 for use in coil coatings, understanding the molecular changes that may occur in situ leading to activation or deactivation of HALS and affecting the total active content remaining in the 530 coating after curing is vital.…”

mentioning

confidence: 99%

Desorption electrospray ionisation mass spectrometry of stabilised polyesters reveals activation of hindered amine light stabilisers

Paine

Gryn’ova

Coote

et al. 2014

Polymer Degradation and Stability

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. (2014). Desorption electrospray ionisation mass spectrometry of stabilised polyesters reveals activation of hindered amine light stabilisers. Polymer Degradation and Stability, Desorption electrospray ionisation mass spectrometry of stabilised polyesters reveals activation of hindered amine light stabilisers AbstractThe use of hindered amine light stabilizers (HALS) to retard thermo-and photo-degradation of polymers has become increasingly common. Proposed mechanisms of polymer stabilisation involve significant changes to the HALS chemical structure; however, reports of the characterisation of these modified chemical species are limited. To better understand the fate of HALS and determine their in situ modifications, desorption electrospray ionisation mass spectrometry (DESI-MS) was employed to characterise ten commercially available HALS present in polyester-based coil coatings. TINUVIN® 770, 292, 144, 123, 152, and NOR371; HOSTAVIN® 3052, 3055, 3050, and 3058 were separately formulated with a pigmented, thermosetting polyester resin, cured on metal at 262 °C and analysed directly by DESI-MS. High-level ab initio molecular orbital theory calculations were also undertaken to aid the mechanistic interpretation of the results. For HALS containing N-substituted piperidines (i.e., N-CH3, N-C(O)CH3, and N-OR) a secondary piperidine (N-H) analogue was detected in all cases. The formation of these intermediates can be explained either through hydrogen abstraction based mechanisms or direct N-OR homolysis with the former dominant under normal service temperatures (ca. 25-80 °C), and the latter potentially becoming competitive under the high temperatures associated with curing (ca. 230-260 °C).

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Lifetime prediction for HALS-stabilized LDPE and PP

Cited by 39 publications

References 14 publications

Study of the effects influencing additive migration in polymers

Study of the effects influencing additive migration in polymers

Polypropylene stabilization by hindered phenols – Kinetic aspects

Desorption electrospray ionisation mass spectrometry of stabilised polyesters reveals activation of hindered amine light stabilisers

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