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A comparison of rheology and FTIR in the study of polypropylene and polystyrene photodegradation

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A comparison of rheology and FTIR in the study of polypropylene and polystyrene photodegradation. / Mylläri, Ville; Ruoko, Tero-Petri; Syrjälä, Seppo.

julkaisussa: Journal of Applied Polymer Science, Vuosikerta 132, Nro 28, 42246, 01.07.2015.

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Mylläri, V, Ruoko, T-P & Syrjälä, S 2015, 'A comparison of rheology and FTIR in the study of polypropylene and polystyrene photodegradation', Journal of Applied Polymer Science, Vuosikerta. 132, Nro 28, 42246. https://doi.org/10.1002/app.42246

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Mylläri, Ville ; Ruoko, Tero-Petri ; Syrjälä, Seppo. / A comparison of rheology and FTIR in the study of polypropylene and polystyrene photodegradation. Julkaisussa: Journal of Applied Polymer Science. 2015 ; Vuosikerta 132, Nro 28.

Bibtex - Lataa

@article{f42d2d9f65b64a6cb98a7d230cdcb1ad,
title = "A comparison of rheology and FTIR in the study of polypropylene and polystyrene photodegradation",
abstract = "Rheology and FTIR spectroscopy are compared as methods to study the degree of photodegradation in polypropylene (PP) and polystyrene (PS) sheets. The materials are hot pressed, artificially photo-aged with fluorescent lights for 4-2048 h and then measured with a rotational rheometer and FTIR. Both materials show a tendency for chain scission which can be seen as a reduction in viscosity. Changes in PP can be observed with both methods after 256 h of irradiation. Changes in PS become significant in rheology after 64 h but in FTIR only after 1024 h of irradiation. Due to the different chemical nature of the materials, the degradation of PS is rather linear with exposure, whereas the degradation of PP is more exponential. Using the zero shear viscosities obtained through extrapolations of the Cole-Cole and Carreau-Yasuda models, relative molecular weights are estimated with the aid of the power-law relationship between these two. These results are compared with the carbonyl indices determined from the FTIR spectra. Rheology is found to be a viable alternative for FTIR in certain situations.",
keywords = "aging, degradation, rheology, thermoplastics, PHOTOOXIDATION, FILMS, PHOTOLYSIS",
author = "Ville Myll{\"a}ri and Tero-Petri Ruoko and Seppo Syrj{\"a}l{\"a}",
note = "ORG=mol,0.7 ORG=keb,0.2 ORG=mei,0.1",
year = "2015",
month = "7",
day = "1",
doi = "10.1002/app.42246",
language = "English",
volume = "132",
journal = "Journal of Applied Polymer Science",
issn = "0021-8995",
publisher = "Wiley",
number = "28",

}

RIS (suitable for import to EndNote) - Lataa

TY - JOUR

T1 - A comparison of rheology and FTIR in the study of polypropylene and polystyrene photodegradation

AU - Mylläri, Ville

AU - Ruoko, Tero-Petri

AU - Syrjälä, Seppo

N1 - ORG=mol,0.7 ORG=keb,0.2 ORG=mei,0.1

PY - 2015/7/1

Y1 - 2015/7/1

N2 - Rheology and FTIR spectroscopy are compared as methods to study the degree of photodegradation in polypropylene (PP) and polystyrene (PS) sheets. The materials are hot pressed, artificially photo-aged with fluorescent lights for 4-2048 h and then measured with a rotational rheometer and FTIR. Both materials show a tendency for chain scission which can be seen as a reduction in viscosity. Changes in PP can be observed with both methods after 256 h of irradiation. Changes in PS become significant in rheology after 64 h but in FTIR only after 1024 h of irradiation. Due to the different chemical nature of the materials, the degradation of PS is rather linear with exposure, whereas the degradation of PP is more exponential. Using the zero shear viscosities obtained through extrapolations of the Cole-Cole and Carreau-Yasuda models, relative molecular weights are estimated with the aid of the power-law relationship between these two. These results are compared with the carbonyl indices determined from the FTIR spectra. Rheology is found to be a viable alternative for FTIR in certain situations.

AB - Rheology and FTIR spectroscopy are compared as methods to study the degree of photodegradation in polypropylene (PP) and polystyrene (PS) sheets. The materials are hot pressed, artificially photo-aged with fluorescent lights for 4-2048 h and then measured with a rotational rheometer and FTIR. Both materials show a tendency for chain scission which can be seen as a reduction in viscosity. Changes in PP can be observed with both methods after 256 h of irradiation. Changes in PS become significant in rheology after 64 h but in FTIR only after 1024 h of irradiation. Due to the different chemical nature of the materials, the degradation of PS is rather linear with exposure, whereas the degradation of PP is more exponential. Using the zero shear viscosities obtained through extrapolations of the Cole-Cole and Carreau-Yasuda models, relative molecular weights are estimated with the aid of the power-law relationship between these two. These results are compared with the carbonyl indices determined from the FTIR spectra. Rheology is found to be a viable alternative for FTIR in certain situations.

KW - aging

KW - degradation

KW - rheology

KW - thermoplastics

KW - PHOTOOXIDATION

KW - FILMS

KW - PHOTOLYSIS

UR - http://www.scopus.com/inward/record.url?scp=84928363110&partnerID=8YFLogxK

U2 - 10.1002/app.42246

DO - 10.1002/app.42246

M3 - Article

VL - 132

JO - Journal of Applied Polymer Science

JF - Journal of Applied Polymer Science

SN - 0021-8995

IS - 28

M1 - 42246

ER -