Cold Crystallization of High and Low Molecular Weight Poly (ethylene oxide) Blends

Li LI

doi:10.14028/j.cnki.1003-3726.2015.08.012

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Cold Crystallization of High and Low Molecular Weight Poly (ethylene oxide) Blends

更新时间：2022-09-18

- Cold Crystallization of High and Low Molecular Weight Poly (ethylene oxide) Blends
- Polymer Bulletin Vol. 28, Issue 8, Pages: 96-100(2015)
- 作者机构：
  
  菏泽学院化学化工系，菏泽　274015
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2015.08.012
  CLC：
- Published：2015-08，
  
  Received：24 April 2015，
  
  Revised：10 June 2015，
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Li LI. Cold Crystallization of High and Low Molecular Weight Poly (ethylene oxide) Blends. [J]. Polymer Bulletin 28(8):96-100(2015)
DOI：

Li LI. Cold Crystallization of High and Low Molecular Weight Poly (ethylene oxide) Blends. [J]. Polymer Bulletin 28(8):96-100(2015) DOI： 10.14028/j.cnki.1003-3726.2015.08.012.

摘要

通过溶液共混法制备了不同重量比的相对分子质量为lOOOOg/mol (10k)和200000g/mol (200k)的聚环氧乙烷(PEO)的共混物，并利用偏光显微镜(POM)、广角X光衍射(XRD)、原子力显微镜(AFM)研究了PEO及其共混物的冷结晶现象。结果表明，PEO共混物在冷结晶的过程中，偏光显微镜图中同一球晶的内外部分亮度不同，即形成内外双折射明显的球晶，研究发现这种现象并不是因为晶型变化引起的，推断是由于共混物在淬冷后升温至20℃的过程中就开始结晶，低温形成的片晶较薄，在20℃等温结晶时形成的片晶较厚，厚度的差别导致了双折射现象。共混物中分子量为200k的PEO提供了结晶成核点，10k PEO起到了溶剂化作用，有利于晶体的成核与生长，所以共混物中大球晶出现的比例比纯物质高。而且随着共混物中10k PEO含量的增加，升温过程中样品结晶的比例增大，球晶中暗处的半径增大。

Abstract

The disproportionately high and low molecular weight PEO blends were prepared by dissolving the two components in chloroform and then volatilizing the solvent. The cold crystallization of PEO and their blends were characterized by POM

XRD and AFM. The results show that PEO blends spherulites have birefringence. The reason is not the change of crystal type

but the thickness of the PEO lamellae are thin which crystallized during the heating process

while the lamellae are thick when crystallized at 20°C. It is the difference in lamellae thickness cause the brightness layered. The 200k PEO serve as nucleus

the 10k PEO play a role of solvent in blends. So the appearance ratio of big spherulites in blends is higher than the pure PEO. The radius of dark area increase as the ratio of 10k PEO increase in blends.

关键词

聚环氧乙烷共混物冷结晶双折射

Keywords

Poly (ethylene oxide)BlendCold crystallizationBirefringence

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