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首页> 外文期刊>Journal of Applied Polymer Science >Size control of poly(2-oxy-6-naphthoyl) whiskers by the addition of oligomers during polymerization
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Size control of poly(2-oxy-6-naphthoyl) whiskers by the addition of oligomers during polymerization

机译：在聚合过程中通过添加低聚物来控制聚（2-氧-6-萘基）晶须的尺寸

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摘要

The method of controlling the size of a poly(2-oxy-6-naphthoyl) (PON) whisker was examined with a focus on lengthening the whisker. PON whiskers were prepared by the polymerization of 2-acetoxy-6-naphthoic acid in liquid paraffin at 330degreesC. The whiskers were very symmetrical. and both tips were very sharp. Growth of the whiskers along the length took place by which oligomer lamellae piled up along the long axis of the needlelike crystals with spiral growth. During steady growth until 8 min, the tip angle of the whiskers was constant at 80degrees. However, it became significantly sharper (22degrees) at 30 min, and later the trunk part of the whiskers stopped increasing. To depress the sharpening of the tips and to extend the steady-growth period for longer whiskers, oligomers were added to the polymerization system after 8 min, just before the tip angle became sharper, to keep the concentration of the oligomers in the polymerization system constant. The addition of the oligomers extended the steady-growth period, and the length increased from 12.5 to 17.3 mum. Although the width of the whiskers increased very slightly with the addition of the oligomers, the axial ratio of the whiskers increased from 19.4 to 24.7. (C) 2003 Wiley Periodicals, Inc. [References: 12]
机译：研究了控制聚（2-氧基-6-萘甲酰基）（PON）晶须尺寸的方法，重点是延长晶须。 PON晶须是在330℃下在液体石蜡中聚合2-乙酰氧基-6-萘甲酸制备的。晶须非常对称。而且两个技巧都非常敏锐。晶须沿长度方向生长，低聚物薄片沿针状晶体的长轴堆积，并呈螺旋状生长。在直到8分钟的稳定生长过程中，晶须的顶角恒定为80度。但是，它在30分钟时变得更加锐利（22度），后来晶须的树干部分不再增加。为了抑制尖端的锐化并延长较长晶须的稳定生长时间，在尖端角度变得更锐利之前，在8分钟后将低聚物添加到聚合体系中，以保持聚合体系中低聚物的浓度恒定。低聚物的加入延长了稳定期，并且长度从12.5增加到17.3μm。尽管随着低聚物的添加，晶须的宽度非常轻微地增加，但是晶须的轴向比从19.4增加到24.7。 （C）2003 Wiley Periodicals，Inc. [参考：12]

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