Ozone Crack Initiation: Statistical and Deterministic Interpretations of Action of p-Phenylenediamines and EPDM as Antiozonants

Ambelang, J. C.; Wilson, F. H.; Porter, LF; Turk, Dorian

doi:10.5254/1.3539289

Cited by 9 publications

(1 citation statement)

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“…EPDM has been well established as a polymeric antiozonant 16. However, because of the nonpolar nature of the EPDM molecules curative migration17, 18 and filler transfer19 occur from this phase to another diene rubber phase having higher unsaturation and polarity.…”

Section: Resultsmentioning

confidence: 99%

Effect of bis(diisopropyl)thiophosphoryl disulfide on the covulcanization of styrene–butadiene rubber and ethylene–propylene–diene (monomer) blends

Ghosh

Das

Basu

2004

J of Applied Polymer Sci

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Covulcanization of elastomer blends constituting styrene-butadiene rubber (SBR) and ethylene-propylene-diene (monomer) rubber (EPDM) was successfully performed in the presence of reinforcing fillers like carbon black and silica by using a multifunctional rubber additive, bis(diisopropyl)thiophosphoryl disulfide (DIPDIS). The polarity of EPDM rubber was increased by a two-stage vulcanization technique, which allowed the formation of rubberbound intermediates. In this way the migration of both curatives and reinforcing fillers in the EPDM-SBR blend could be controlled and cure rate mismatch could be minimized. The process significantly improved the physical properties of the blend vulcanizates. The phase morphology, as evident from the SEM micrographs, was indicative of the presence of a much more compact and coherent rubber matrix in the two-stage vulcanizates. Different accelerator systems were studied to understand better the function and effectiveness of DIPDIS in developing homogeneity in the blends of dissimilar elastomers.

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Section: Resultsmentioning

confidence: 99%

Effect of bis(diisopropyl)thiophosphoryl disulfide on the covulcanization of styrene–butadiene rubber and ethylene–propylene–diene (monomer) blends

Ghosh

Das

Basu

2004

J of Applied Polymer Sci

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The role of hindered piperidine (HALS) compounds for the stabilization of polypropylene against oxidation reactions caused by ozone and oxidative products formed during photolysis of ozone

Lucki

Rabek

Rånby

et al. 1988

J of Applied Polymer Sci

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SynopsisThe role of hindered piperidine (HALS) photostabilizers for the photostabilization of polypropylene films against oxidative reactions caused by ozone and oxidative species formed during photolysis of ozone under UV irradiation (i.e., atomic oxygen and singlet oxygen) has been investigated and discussed. It has been found that ozonization and/or photoozonization of 2,2,6,6-tetramethyl-piperidine (I) and piperidinoxy radical (2,2,6,6-tetramethylpiperidino-l-oxy) (11) gives a high yield (91-988) 2,6-dimethyl-2-hydroxy-6-nitro-heptane. Ozonization and/or photoozonization of HAIS probably occur by a similar mechanism as reported for (I) and (11). HALS photostabilizer reacts with ozone and/or photolysis products of ozone (atomic oxygen and/or singlet oxygen) and loses its function in the photostabilization process. For that reason protection of polypropylene against photooxidative degradation and photoozonization is of great commercial importance.

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A Review of Polymer Interfaces in Tyre Technology

1990

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The study of polymer interfaces is of prime importance in the field of tyre technology due to the critical role these contribute to tyre operation. The paper reviews the main polymer interfaces present in a t y r e g l ) tyre/road (tyre wear or abrasion; tyre traction/skid resistance); (2) polymer/filler (carbon black; silica): (3) polymer/cord (brass coated steel wire; textilcrayon, nylon, polyester, aramid); (4) compound/compound (tack); (5) tyrepair (oxygen/ozone protection)-with respect to the criteria required, physical and chemical, to achieve optimum performance.

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Ozone Crack Initiation: Statistical and Deterministic Interpretations of Action of p-Phenylenediamines and EPDM as Antiozonants

Cited by 9 publications

References 0 publications

Effect of bis(diisopropyl)thiophosphoryl disulfide on the covulcanization of styrene–butadiene rubber and ethylene–propylene–diene (monomer) blends

Effect of bis(diisopropyl)thiophosphoryl disulfide on the covulcanization of styrene–butadiene rubber and ethylene–propylene–diene (monomer) blends

The role of hindered piperidine (HALS) compounds for the stabilization of polypropylene against oxidation reactions caused by ozone and oxidative products formed during photolysis of ozone

A Review of Polymer Interfaces in Tyre Technology

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