DOUBLE LAMELLAE OF POLYCETHYLENE OXIDE)

SONG Dan-dan; BU Hai-shanm; YU Tong-yin

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DOUBLE LAMELLAE OF POLYCETHYLENE OXIDE)

Research Article | 更新时间：2021-03-19

- DOUBLE LAMELLAE OF POLYCETHYLENE OXIDE)
- Acta Polymerica Sinica Issue 6, Pages: 698-706(1993)
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- Published：20 December 1993，
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SONG Dan-dan, BU Hai-shanm, YU Tong-yin. DOUBLE LAMELLAE OF POLYCETHYLENE OXIDE). [J]. Acta Polymerica Sinica (6):698-706(1993)
DOI：

SONG Dan-dan, BU Hai-shanm, YU Tong-yin. DOUBLE LAMELLAE OF POLYCETHYLENE OXIDE). [J]. Acta Polymerica Sinica (6):698-706(1993) DOI：

摘要

聚环氧乙烷(Mn=7000)的双层片晶形态用透射电镜和差示扫描量热计进行了研究。在结晶温区54—56℃

现察到双层片晶

高于这个温区

同时看到双层片晶及单层片晶

低于这个温区

只看到单层片晶。双层片晶的熔点稍高于单层片晶。根据非整数次折迭链晶向整数次折迭链晶的转变

讨论了双层片晶和单层片晶的生长过程。在双层片晶界面上的H键降低了表面自由能

这是形成双层片晶的主要原因。

Abstract

The double lamellae morphology of poly (ethylene oxide) was investigated by using transmission electron microscopy (TEM) and differential scanning calorimetry(DSC). The double lamellae were observed in the crystallization temperature region 54-56℃

above 56℃ both double lamellae and single layer lamellae were formed

but below 54 ℃ only single layer lamellae could be found. The melting point of double lamellae crystals was found to be slightly higher than single layer lamellae. On the basis of the transformation of nonintegral folede-chain (NIF) crystals into integral folded-chain(IF) crystals

the growth processes of double lamellae and single layer lamellae is discussed.H bonds on facing folded chain crystal surfaces leda to a decrease of surface free energy and this fact is a main reason for the formation of double lamellae.

关键词

聚环氧乙烷双层片晶结晶形态熔融

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扬州大学化学化工学院

扬州大学江苏省环境工程与环境材料重点实验室

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