Photostabilization of polypropylene by a hindered amine

Durmis, J.; Carlsson, D. J.; Chan, Kam; Wiles, D. M.

doi:10.1002/pol.1981.130191105

Cited by 25 publications

(7 citation statements)

References 11 publications

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“…There are relatively abundant literature data obtained on thin samples and showing that additive evaporation from polyolefins is effectively a first-order process (see for instance Ref. [28]). Lundback et al [25,26] consider rather the loss rate r e and a ''rate constant'' F 0 defined by:…”

Section: Discussionmentioning

confidence: 99%

Stabilizer thickness profiles in polyethylene pipes transporting drinking water disinfected by bleach

Colin¹,

Verdú²,

Rabaud³

2011

Polymer Engineering & Sci

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Polyethylene connection pipes of wall thickness ranging from 3.0 to 4.5 mm, used for 0, 5, 9, 12, and 18 years in the French network of drinking water disinfected by bleach, have been analyzed. The stabilizer thickness profiles reveal that bleach destroys the stabilizer in a superficial layer of about 0.5 mm depth at the water-polymer interface. In the rest of the wall, stabilizer is lost by physical processes, i.e., transport by diffusion into the bulk, extraction at the water-polymer interface, and evaporation at the polymer-air interface. The whole loss kinetics is governed by extraction and evaporation. The classical scheme for evaporation-diffusion process has been used to model physical loss processes, but with boundary conditions different from the literature ones. Concerning chemical aspects, some mechanisms proposed in the literature are criticized. The identification of the bleach reactive species remains an open question. POLYM. ENG. SCI., 51:1541-

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Section: Discussionmentioning

confidence: 99%

Stabilizer thickness profiles in polyethylene pipes transporting drinking water disinfected by bleach

Colin¹,

Verdú²,

Rabaud³

2011

Polymer Engineering & Sci

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“…Amine type antioxidants were used as radical chain terminators and UV stabilizing additives for polymers [5][6][7][8][9] such as polypropyrene. In this paper, the effects of amine type antioxidants on the chemical crosslinking of PE were investigated by ESR.…”

Section: Introductionmentioning

confidence: 99%

ESR study on chemical crosslinking reaction mechanisms of polyethylene using a chemical agent. III. Effect of amine type antioxidants

Yamazaki

Seguchi

1999

J. Polym. Sci. A Polym. Chem.

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“…Such development of volatility of stabilizers from polymers differs from the evaporation of the pure stabilizers where the dependence of the weight decrease on time is linear20,21 to what corresponds to the kinetic equation of the zero order. The exponential development of the curves of volatility of additives from polymers is already known, 10,15,19,22 and is correlated by the first order kinetic equation. According to Angert15 this dependence is described by analytical equation: (1) c / c , = 1 -exp ( -k t ) where c is the quantity of the substance evaporated in the time t , c, is initial concentration of the additive, and k is a rate constant of the process.…”

Section: Resultsmentioning

confidence: 99%

Effect of phase transitions on the volatility of UV absorbers from polypropylene

Lustoň

Pastus̆áková²,

Vašš

1993

J of Applied Polymer Sci

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SYNOPSISThe volatility of 2-hydroxy-4-methoxybenzophenone and 2-(2'-hydroxy-5'-methylphenyl) benzotriazole from isotactic polypropylene was studied by thermal methods in the temperature range that included the melting point of one of the stabilizers and the fusion of the polymer. The process proceeds according to the first order of kinetics. The rate constants of the stabilizers' volatility were calculated and the Arrhenius plots were constructed. The observed discontinuities in the Arrhenius dependences are interpreted as the result of the phase transitions of the polymer (melting) and the stabilizer. The activation energies for all zones were calculated. 0 1993 John Wiley & Sons, Inc.

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Photostabilization of polypropylene by a hindered amine

Cited by 25 publications

References 11 publications

Stabilizer thickness profiles in polyethylene pipes transporting drinking water disinfected by bleach

Stabilizer thickness profiles in polyethylene pipes transporting drinking water disinfected by bleach

ESR study on chemical crosslinking reaction mechanisms of polyethylene using a chemical agent. III. Effect of amine type antioxidants

Effect of phase transitions on the volatility of UV absorbers from polypropylene

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