The use of TGA to study thermal ageing effects of orientated polypropylene

Horrocks, A. Richard; D'Souza, Jennifer A.

doi:10.1016/0040-6031(88)85245-6

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…This paper extends the scope of a previously published short communication 26 and describes the use of thermal analytical methods (DTA and TGA) for investigating the effect that oven aging at 130°C has on induction period behaviors of various differently uniaxially orientated films produced from a commercial stabilized polypropylene polymer specified for use in geotextile products. The study represents the first stage within a larger research program whereby variously stabilized polypropylene orientated tapes having acceptable commercial properties will be both oven-and ambient-temperature-aged in attempts to determine the changes in physicochemical character during the early stages of oxidation and therefore more effectively predict service lifetimes.…”

Section: Introductionmentioning

confidence: 98%

Physicochemical changes in stabilized, orientated polypropylene films during the initial stages of thermal oxidation

Horrocks

D'Souza

1991

J of Applied Polymer Sci

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SYNOPSISOrientated, stabilized, isotactic polypropylene films have been oven-aged at 130°C for times shorter than required for their embrittlement. The structural changes occurring during this induction period have been studied using tensile tensiometric, density, thermal analytical (DTA and TGA) , and infrared spectrophotometric techniques. After an initially rapid annealing, films show similar time-dependent changes in tensile, density-derived crystalline and thermogravimetric behaviors. Comparison with vacuum-aged sample properties shows that these changes reflect the effects of oxidative attack of polypropylene chains. Infrared examination shows that, even after the longest aging times studied and close to the induction period for embrittlement, the presence of oxidized chain groups is only just discernible. Oven aging reduces post-fusion oxidative onset and maximum mass loss temperatures determined by TGA. Kinetic analysis demonstrates that the apparent activation energies and Arrhenius factors are reduced during aging as the post-fusion oxidation mechanism becomes more complex. The results suggest that, during the induction period, changes in both physical and chemical structural features of orientated polypropylene occur which have possible importance in determining the lifetime of the polymer in use.

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Section: Introductionmentioning

confidence: 98%

Physicochemical changes in stabilized, orientated polypropylene films during the initial stages of thermal oxidation

Horrocks

D'Souza

1991

J of Applied Polymer Sci

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“…The photo and thermal oxidation of polypropylene with UV ray in the solid phase at different wavelengths (544 nm, 356 nm, etcÉ) were also studied [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Polypropylene Homopolymer in the Molten State in Presence of Air

Abdouss¹,

Sharifi-Sanjani²,

Bataille³

1999

Journal of Macromolecular Science, Part A

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The oxidation of polypropylene (PP) homopolymer in air was performed using dodecanol-1 as an accelerator. The experiments were conducted under atmospheric pressure at 180-220 o C. Spectroscopic data indicated the formation of polar groups such as ketones, esters, alcohols, anhydrides etc. as determined by FTIR and ESCA. The scanning electron microscopy (SEM) showed the variations of morphology of the oxidation products. The fusion temperatures were determined by differential scanning calorimetry (DSC). The variations of solubility of PPO as compared with the original PP were investigated in solvents such as MEK, THF, and toluene.Surface tension and molecular weights were determined by tensiometry and gel premeation chromatography (GPC). The melt flow index (MFI) of different samples were determined.

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Thermal analysis of polymeric materials

Haines

1989

Thermochimica Acta

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The use of TGA to study thermal ageing effects of orientated polypropylene

Cited by 5 publications

References 13 publications

Physicochemical changes in stabilized, orientated polypropylene films during the initial stages of thermal oxidation

Physicochemical changes in stabilized, orientated polypropylene films during the initial stages of thermal oxidation

Oxidation of Polypropylene Homopolymer in the Molten State in Presence of Air

Thermal analysis of polymeric materials

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