Ageing of polypropylene: processes and consequences

Fiebig, Joachim; Gahleitner, Markus; Paulik, Christian; Wolfschwenger, Johannes

doi:10.1016/s0142-9418(98)00023-3

Cited by 53 publications

(31 citation statements)

References 16 publications

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“…In both cases, therefore, elongation at break decreased faster than storage modulus increased, validating our measure of brittleness Eq. (8) in accord with the observation in 36 that aging produced embrittlement.…”

Section: Discussionsupporting

confidence: 87%

“…35,36 What is not well characterized is what happens We have found for a chlorosulfonated polyethylene polymer known as Hypalon® and for trilayered Hypalon with Neoprene® that EЈ increases and ⑀ b decreases with aging. 37 After aging 88 days, EЈ for Hypalon increased an estimated 16% while the average decrease in ⑀ b for samples aged between 1 and 88 days was 20%.…”

Section: Discussionmentioning

confidence: 99%

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Sliding wear, viscoelasticity, and brittleness of polymers

2006

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We have connected viscoelastic recovery (healing) in sliding wear to free volume in polymers by using pressure-volume-temperature (P-V-T) results and the Hartmann equation of state. A linear relationship was found for all polymers studied with a wide variety of chemical structures, except for polystyrene (PS). Examination of the effect of the indenter force level applied in sliding wear on the healing shows that recovery is practically independent of that level. Strain hardening in sliding wear was observed for all materials except PS, the exception attributed to brittleness. Therefore, we have formulated a quantitative definition of brittleness in terms of elongation at break and storage modulus. Further, we provide a formula relating the brittleness to sliding wear recovery; the formula is obeyed with high accuracy by all materials including PS. High recovery values correspond to low brittleness, and vice versa. Our definition of brittleness can be used as a design criterion for choosing polymers for specific applications.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Sliding wear, viscoelasticity, and brittleness of polymers

2006

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“…The ageing of polymeric materials due to their oxidation is widespread and poses a serious problem because the absorption of even a low quantity of oxygen can cause irreversible and damaging changes in their physical and mechanical properties. The degradation, ageing and stabilisation of polymers constitute a considerable area of interest in industry and science, and the aim is to obtain new, stable polymeric materials [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Morin hydrate as pro-ecological antioxidant and pigment for polyolefin polymers

Masek

Chrześcijańska

Zaborski

2013

Comptes Rendus. Chimie

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“…The degradation of sterilized medical plastics continues for a long time during their shelf life and service, this process called post-degradation or post-sterilization. Some authors [1][2][3] have previously studied the effect of steam sterilization on PP. It was reported that steam sterilized PP at 121°C undergo changes in the crystalline structure mostly post-crystallization and physical aging effects [1], while no significant effect on the molecular structure was observed at this temperature [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…Some authors [1][2][3] have previously studied the effect of steam sterilization on PP. It was reported that steam sterilized PP at 121°C undergo changes in the crystalline structure mostly post-crystallization and physical aging effects [1], while no significant effect on the molecular structure was observed at this temperature [2,3]. Currently most of medical plastics sterilized by γ-radiation, which is used when materials are sensitive to the high temperature of autoclaving.…”

Section: Introductionmentioning

confidence: 99%