Study of thermo-oxidative degradation of molten state polypropylenes with a variety of tacticities

Hatanaka, Tomoyuki; Mori, Hideharu; Terano, Minoru

doi:10.1016/s0141-3910(98)00207-9

Cited by 29 publications

(9 citation statements)

References 24 publications

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“…The altered degradation kinetics of tactic PS demonstrated in our TGA measurements compliments the previous literature reports21, 22, 42, 43 addressing tacticity as factor that can affect the degradation behavior of polymers. Since the reported stability of tactic PP has been investigated22 in the reactive atmosphere of air, which is fundamentally different from the inert environment used in the present study, it seems more appropriate to compare our results with the results of degradation study of tactic PMMA performed in the inert atmosphere. The thermal stability of PMMA has been found21 to depend on its tacticity, and chain mobility has been proposed as a key factor controlling the polymer degradation.…”

Section: Resultssupporting

confidence: 91%

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Tacticity as a Factor Contributing to the Thermal Stability of Polystyrene

Chen

Harris

Vyazovkin

2007

Macro Chemistry & Physics

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TGA has been used to study the thermal degradation of PS in atactic (aPS), syndiotactic (sPS), and isotactic (iPS) forms. Thermal stability of sPS is similar to that of aPS, whereas iPS degrades at a notably higher temperature. TGA‐FT‐IR data do not show any obvious difference in the degradation products of the three materials. Isoconversional kinetic analysis of non‐isothermal TGA data yields somewhat higher activation energy for degradation of iPS than for aPS that is found to result in a smaller rate constant for iPS. Another important factor contributing to slower degradation rate of iPS is found to be the reaction model that has been experimentally determined from isothermal TGA measurements. The enhanced thermal stability of iPS correlates with its hindered molecular mobility that appears to originate from intramolecular confinement. The hindered mobility has been detected by comparing the glass transition dynamics in amorphous iPS and aPS samples. By using multi‐frequency temperature modulated DSC (TOPEM®) it has been demonstrated that the activation energy of the glass transition is noticeably larger for iPS than for aPS that supports the hypothesis of the slowed down molecular mobility.

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Section: Resultssupporting

confidence: 91%

“…In an inert atmosphere, the syndiotactic form of PMMA displays a higher degradation temperature than the isotactic one21 that is attributed to the slower chain mobility of the former. A study of the thermo‐oxidative degradation of PP in air demonstrates that the syndiotactic form is more stable than isotactic one 22…”

Section: Introductionmentioning

confidence: 99%

Tacticity as a Factor Contributing to the Thermal Stability of Polystyrene

Chen

Harris

Vyazovkin

2007

Macro Chemistry & Physics

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“…A comparison between isotactic and syndiotactic PP showed that the last one is much more stable [88,90].…”

Section: Effect Of Crystallinity and Stereoregularitymentioning

confidence: 99%

Review on the thermo-oxidative degradation of polymers during processing and in service

Gijsman

2008

E-Polymers

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“…[10][11][12][13]. For example, Terano et al [14] found that atactic and syndiotactic PP were much more M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 3 stable than isotactic PP having a long isotactic sequence, while the catalyst residue and molecular weight has a slight influence on the thermal-oxidative degradation of isotactic PP. Recently, Suzuki et al [15] found that PP with broader tacticity has higher resistance to degradation.…”

Section: Introductionmentioning

confidence: 99%