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New Method for Fabricating Aromatic Polyamide Particles with a Narrow Particle Size Distribution
Author(s) -
Yoshioka Yayoi,
Asao Katsuya,
Yamamoto Kazuhiko,
Tachi Hideki
Publication year - 2007
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.200600019
Subject(s) - polyamide , crystallinity , materials science , particle size , particle size distribution , polymerization , morphology (biology) , polymer chemistry , acetone , particle (ecology) , chemical engineering , precipitation polymerization , precipitation , polymer , molar mass distribution , composite material , chemistry , radical polymerization , organic chemistry , oceanography , physics , biology , meteorology , engineering , genetics , geology
Three types of aromatic polyamide particles have been prepared from reacting diamines and diacid chlorides in an acetone or dioxane solution that includes water, using the precipitation polymerization method employing ultrasonic irradiation. The particle diameters were in the range from 300 nm to 1.2 µm with a narrow size distribution. The surface morphology and crystallinity differed greatly among the particles. They began to degrade at temperatures above 400 °C. Also the morphology depended on the ultrasonic frequency. The addition of water was essential to form particles using this polymerization method. Further it was useful to increase the molecular weights of polyamide products.