NDLI: Complete relaxation map of polypropylene: radiation-induced modification as dielectric probe

Content Provider	Springer Nature Link
Author	Suljovrujic, E.
Copyright Year	2012
Abstract	The molecular relaxation behaviour of isotactic polypropylene (iPP) exposed to gamma radiation in air to various absorbed doses (up to 700 kGy) has been investigated by dielectric loss ( $$ { \tan }\;\delta $$ ) analysis; the polar (mainly carbonyl and hydroperoxide) groups that were introduced by radiation-induced oxidation were considered as tracer groups. All relaxation zones (α, β, γ and δ in the order of decreasing temperature), between 25 K and melting temperature, were studied in the frequency range from 1 kHz to 1 MHz. The changes observed in the dielectric relaxation spectra were related to the modifications in the structural and morphological parameters attributed to exposure of the iPP samples to radiation. Wide-angle X-ray diffraction was used to investigate radiation-induced changes in the crystalline structure and degree of crystallinity, since the α relaxation is connected with this phase. Infrared spectroscopy and gel measurements were used to determine the changes in the oxidative degradation and the degree of network formation, respectively. Conclusions derived using different methods were compared. This study reveals high dielectric and/or relaxation sensitivity of iPP to gamma radiation. Disappearance of the low-temperature dielectric (γ and δ) relaxations together with large changes in intensity, position and activation energy of the dielectric α relaxation are observed with gamma irradiation and are mainly connected with oxidative degradation in iPP structure.
Starting Page	2033
Ending Page	2047
Page Count	15
File Format	PDF
ISSN	01700839
Journal	Polymer Bulletin
Volume Number	68
Issue Number	7
e-ISSN	14362449
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-02-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polypropylene Gamma radiation Oxidation Dielectric relaxation Polar groups Polymer Sciences Characterization and Evaluation of Materials Physical Chemistry Soft and Granular Matter, Complex Fluids and Microfluidics
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Condensed Matter Physics Polymers and Plastics

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