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The effects of ultrasonic irradiation on the crystalline structures of nucleated polypropylene
Author(s) -
Cao Yurong,
Xiang Ming,
Li Huilin
Publication year - 2002
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.10516
Subject(s) - talc , polypropylene , crystallization , nucleation , materials science , ultrasonic sensor , spherulite (polymer physics) , crystal (programming language) , mica , crystal growth , composite material , chemical engineering , polymer chemistry , crystallography , chemistry , polymer , organic chemistry , physics , acoustics , computer science , engineering , programming language
The effects of ultrasonic irradiation on crystallization behavior of polypropylene (PP)‐loaded fillers with nucleating activities, such as sodium benzoate, talc (P), talc (A), and mica, are examined. DSC and WAXD analyses demonstrate that the crystalline structure of PP is changed through ultrasonic vibration. Different nucleating systems have their own specific responses to ultrasound. In sodium benzoate‐added PP, β‐crystal appears when ultrasonic with an appropriate intensity was applied, which alters the growth of PP crystals and favors a special crystal transformation (α→β). On the other hand, ultrasonic does not induce β‐form in the talc or mica system, but prefers crystal growth of (040) plane. Based on the crystalline structure and structures of nucleating agents, the ultrasonic effects in determination of the crystalline preferential growth are analyzed. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 1956–1961, 2002; DOI 10.1002/app.10516