Copolymerization effect of m-acetoxybenzoic acid on morphology of poly(oxy-1,4-benzenediylcarbonyl) whiskers |
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Authors: | Kunio Kimura Yuhiko Yamashita |
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Abstract: | Copolymerizations of p-acetoxybenzoic acid (p-ABA) and m-acetoxybenzoic acid (m-ABA) were carried out in liquid paraffin at 330°C without stirring. Needlelike crystals are obtained when the content of m-ABA in the feed (χf) is in the range of 0–30 mol %. These needlelike crystals are inclined to show the fibrillation in both ends and the radial growth nature from the central part as χf increased. At higher χf than 40 mol %, crystals are not precipitated during polymerization. The content of m-oxybenzoyl units in the obtained whiskers (χw) are much lower than χf. The details of the polymerization and crystallization processes reveal that cooligomers containing more m-oxybenzoyl units cannot participate in the formation of needlelike crystals due to the higher solubility and the segregation effect of crystallization. The whiskers are predominantly formed by co-oligomers consisting almost entirely of p-oxybenzoyl units. © 1996 John Wiley & Sons, Inc. |
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Keywords: | poly(oxy-1 4-benzenediylcarbonyl) polymer whisker copolymerization needlelike crystals crystallization during polymerization |
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