Study of free volume parameters of polystyrenes of different molecular architecture by positron annihilation lifetime measurement

H. Li; Y. Ujihira; A. Nanasawa

doi:10.1007/bf02056393

Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 210: Issue 2

Study of free volume parameters of polystyrenes of different molecular architecture by positron annihilation lifetime measurement

Authors:

H. Li

H. Li University of Tokyo Research Center for Advanced Science and Technology Komaba 4-6-1, Meguro-ku 153 Tokyo (Japan)

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Y. Ujihira

Y. Ujihira University of Tokyo Research Center for Advanced Science and Technology Komaba 4-6-1, Meguro-ku 153 Tokyo (Japan)

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A. Nanasawa

A. Nanasawa Asahi Chemical Indusry Co. Ltd. 1-3-1 Yakoh, Kawasaki-ku 210 Kawasaki City, Kanagawa (Japan)

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Pages:: 533–541

Online Publication Date:: 13 Aug 2005

Publication Date:: 17 Nov 1996

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02056393

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Abstract

Differences of size, content and size distribution of free volumes in linear branched and three-armed polystyrenes, synthesized by radical and anionic processes, were observed by positron annihilation lifetime measurements. The temperature dependence of an average free volume radius was quite similar among polystyrenes of different architectures and molecular weight distributions. The free volume radius increased with temperature, from 0.27 nm (T:60 K) to 0.29 nm (T:260 K) and 0.30 nm (T_g:363 K), then to 0.35 nm (423 K), showing turning at and transition temperature. The free volume content decreased from 60 K to 220 K to 300 K showing peculiar minimum at 220 K to 300 K depending on the molecular shape, increased above 320 K, upto 340 to 360 K. The free volume contents decreased with an increase of molecular weight and by an addition of oligomer or plasticiser, suggesting differences in relaxation time or molecular motion between the edge and middle portions of molecular chain and filling effect of smaller molecules in free volumes, respectively. The apparent free volume fraction showed clear variations atT andT_g. Size distribution of free volumes suggested more complicated behavior of free volume upon the molecular relaxations and filling effect.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)