Positron Spectroscopy of Free Volume in Poly(vinylidene fluoride) after Helium Ions Irradiation; Chinese Journal of Polymer Science; Vol. 37, No. 5

Positron Spectroscopy of Free Volume in Poly(vinylidene fluoride) after Helium Ions Irradiation; Chinese Journal of Polymer Science; Vol. 37, No. 5

Bibliographic Details
Parent link:	Chinese Journal of Polymer Science Vol. 37, No. 5.— 2019.— [P. 527-534]
Main Author:	Lyu Jinzhe
Corporate Author:	Национальный исследовательский Томский политехнический университет Инженерная школа ядерных технологий Отделение экспериментальной физики
Other Authors:	Laptev R. S. Roman Sergeevich, Dubrova N. A. Nataliya Aleksandrovna
Summary:	Title screen Free volume is an extremely important intrinsic defect in polymers. Structurally, free volume is the randomly distributed holes in the polymer molecular chain segments. In proton exchange membrane fuel cells, free volume is also the space needed for the directional conduction of protons. Irradiation by α particles to grafting sulfonated poly(vinylidene fluoride) (PVDF) is one of the methods to produce proton exchange membrane with good proton channel rate. Positron annihilation lifetime spectroscopy was used to study the free volume size at different absorbed dose levels from 0.13 MGy to 0.65 MGy. Measurement method of positron annihilation lifetime spectroscopy for PVDF based on 44Ti positron source was developed. For low dose irradiation at 0.26 MGy, a decrease in free volume and practically unchanged crystallinity were observed. Further increase of absorbed dose range from 0.26 MGy to 0.39 MGy led to an increasing crystallinity with the same free volume level. For the absorbed dose from 0.39 MGy to 0.65 MGy, crystallinity was decreased but free volume remained almost constant. Режим доступа: по договору с организацией-держателем ресурса
Language:	English
Published:	2019
Subjects:	электронный ресурс труды учёных ТПУ positron annihilation free volume XRD poly(vinylidene fluoride) helium ions connection degradation аннигиляция гелий позитронная спектроскопия облучение ионами
Online Access:	https://doi.org/10.1007/s10118-019-2195-2
Format:	Electronic Book Chapter
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=664359

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