Open AccessSignificant influence of isothermal crystallization conditions on charge stability of fluorinated cellular polypropylene films
Author(s) -
Junlan Yao,
Zhenlian An,
Mingjun Mao,
Yewen Zhang,
Zhang Xia
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.6508
Subject(s) - crystallization , isothermal process , materials science , polypropylene , charge (physics) , diffraction , analytical chemistry (journal) , charge density , chemical engineering , thermodynamics , composite material , optics , chemistry , organic chemistry , physics , quantum mechanics , engineering
On the basis of the measurement of open-circuit thermally stimulated discharge current and isothermal charge decay, the influence of isothermal crystallization conditions on charge stability of fluorinated cellular polypropylene (PP) film was systematically investigated. The results indicate that the time and temperature of isothermal crystallization of the fluorinated PP film have significant influences on its charge trap structure and charge stability. Charge traps and charge stability can be significantly deepened or improved even by isothermal crystallization at 90 ℃ for 0.5 h. And with the increase of crystallization temperature and time, charge traps are deepened further, presenting further improved charge stability, as observed in the case of isothermal crystallization at 130 ℃ for more than 2 h. Attenuated total reflection infrared analysis and wide angle X-ray diffraction measurement indicate that the improvement of charge stability results from the changes in chemical composition and structure of the PP film.