Polymer degradation initiated via infectious behavior

Celina, Mathias C.; Clough, R.L.; Jones, Gary D.

doi:10.1016/j.polymer.2005.04.033

Cited by 30 publications

(16 citation statements)

References 16 publications

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“…As materials that accelerate the thermal oxidative degradation of iPP, benzoyl peroxide (BPO) [11], formaldehyde [11,22] and organic acids [11,23] have been reported. The acceleration effect of BPO is due to its radical-initiating ability [11], whereas the formaldehyde and organic acid additives are considered to catalyze the hydroperoxide decomposition as prodegradants [11,22,23].…”

Section: Resultsmentioning

confidence: 99%

“…The acceleration effect of BPO is due to its radical-initiating ability [11], whereas the formaldehyde and organic acid additives are considered to catalyze the hydroperoxide decomposition as prodegradants [11,22,23]. Considering the chemical structure, the acceleration effect of unsaturated chain end groups is likely due to not only the catalysis of the hydroperoxide decomposition, but also their action as degradation initiators.…”

Section: Resultsmentioning

confidence: 99%

“…This model was constructed assuming that the unoxidized polymer fraction was infected by the spatial expansion from the initial oxidized zone. The validity of the model has been confirmed experimentally [9][10][11][12]. Low-molecular-weight materials, such as dialkyl peroxides, hydroperoxides and macroradical species, have been considered as initiators [6,9,11,12].…”

Section: Introductionmentioning

confidence: 97%

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Degradation behavior of polymer blend of isotactic polypropylenes with and without unsaturated chain end group

Nakatani

Kurniawan

Taniike

et al. 2008

Science and Technology of Advanced Materials

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In this work, the relationship between the unsaturated chain end group content and the thermal oxidative degradation rate was systematically studied with binary polymer blends of isotactic polypropylene (iPP) with and without the unsaturated chain end group. The iPPs with and without the unsaturated chain end group were synthesized by a metallocene catalyst in the absence of hydrogen and by a Ziegler catalyst in the presence of one, respectively. The thermal oxidative degradation rate of the binary iPP blends was estimated from the molecular weight and the apparent activation energy ( E), which were obtained through size exclusion chromatography (SEC) and thermogravimetric analysis (TGA) measurements, respectively. These values exhibited a negative correlation against the mole content of the unsaturated chain end group. The thermal oxidative degradation rate apparently depends on the content of the unsaturated chain end group. This tendency suggests that the unsaturated chain end acts as a radical initiator of the iPP degradation reaction.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Degradation behavior of polymer blend of isotactic polypropylenes with and without unsaturated chain end group

Nakatani

Kurniawan

Taniike

et al. 2008

Science and Technology of Advanced Materials

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“…Chemiluminescence measurement has been used as a tool for the investigation of the oxidation of various polymers or polymer materials at elevated temperatures,4–11 solar or UV light,12–15 cold helium plasma,16 electrical stress,17 electron beam18 and γ‐ray irradiation 19, 20. Many attempts have been made to use chemiluminescence for estimation the efficiency of stabilizers 21–28…”

Section: Introductionmentioning

confidence: 99%

Chemiluminescence of isotactic polypropylene induced by photo‐oxidative degradation and natural weathering

Jipa

Setnescu

Zaharescu³

et al. 2006

J of Applied Polymer Sci

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The analysis of the chemiluminescence (CL) kinetic parameters (induction time, oxidation rate, and activation energy) after the UV irradiation and outdoor exposure of isotactic polypropylene (i-PP) films have been studied. The initial CL emission intensity increased with increasing photodegradation time of i-PP films. On photodegradation, the activation energies were found to decrease linearly with time of UV-irradiation and outdoor exposure.The slopes of these linear dependences were used to indicate the degree of photodegradation of the polymer and also for the characterization of the stabilizing effect of the additive.

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“…This model was constructed by assuming that the unoxidized polymer fraction was infected by the spatial expansion from initial oxidized zone. The validity of this has been confirmed experimentally 23–26. The low‐molecular‐weight materials, such as dialkyl peroxides and hydroperoxides, are considered the primary infectious agent (initiator).…”

Section: Resultsmentioning

confidence: 78%

Effect of unsaturated chain end‐group on thermal oxidative behavior of polypropylene

Nakatani

Suzuki

Tanaka

et al. 2007

Polymer International

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In order to clarify the influences of unsaturated chain end-groups on the oxidative degradation of isotactic polypropylene (iPP), values of activation energy ( E) for the oxidative degradation reactions of Zieglercatalyzed iPP (ZiPP) and metallocene-catalyzed iPP (MiPP) having similar tacticity were evaluated by the temperature dependence of the oxidation induction time as determined by thermogravimetric analysis over the range 130-145 • C. The correlation between the content of unsaturated chain end-groups and the change of E was also studied. The results obtained indicated that the unsaturated chain end-groups strongly influenced the rate of iPP degradation. Moreover, on addition of oligomer-like MiPP having unsaturated chain end-groups, the E value of ZiPP became lower, suggesting that iPP having unsaturated chain end-groups served as an infectious agent of the degradation.

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Polymer degradation initiated via infectious behavior

Cited by 30 publications

References 16 publications

Degradation behavior of polymer blend of isotactic polypropylenes with and without unsaturated chain end group

Degradation behavior of polymer blend of isotactic polypropylenes with and without unsaturated chain end group

Chemiluminescence of isotactic polypropylene induced by photo‐oxidative degradation and natural weathering

Effect of unsaturated chain end‐group on thermal oxidative behavior of polypropylene

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