Crystallization Behavior of Disproportionately High and Low Molecular Weight PEO Blends

Li Li; Jun-teng Liu; Zhong-jie Ren; Shou-ke Yan

doi:10.1007/s10118-014-1497-7

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Crystallization Behavior of Disproportionately High and Low Molecular Weight PEO Blends

Updated：2021-06-21

- Crystallization Behavior of Disproportionately High and Low Molecular Weight PEO Blends
- Chinese Journal of Polymer Science Vol. 32, Issue 9, Pages: 1199-1209(2014)
- Affiliations：
  
  Department of Chemistry and Chemical Engineering, Heze University, Heze 274015, China
  Beijing Key Laboratory of Membrane Science & State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
- Author bio：
  
  **Shou-ke Yan (闫寿科), E-mail: skyan@mail.buct.edu.cn
- Funds：
- DOI：10.1007/s10118-014-1497-7
  CLC：
- Received：21 March 2014，
  
  Revised：2014-05-15，
  
  Accepted：16 May 2014，
  
  Published：2014-09
- Accepted：
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Li Li, Jun-teng Liu, Zhong-jie Ren, et al. Crystallization Behavior of Disproportionately High and Low Molecular Weight PEO Blends[J]. Chinese Journal of Polymer Science, 2014, 32(9): 1199-1209.
DOI：

Li Li, Jun-teng Liu, Zhong-jie Ren, et al. Crystallization Behavior of Disproportionately High and Low Molecular Weight PEO Blends[J]. Chinese Journal of Polymer Science, 2014, 32(9): 1199-1209. DOI： 10.1007/s10118-014-1497-7.

摘要

Abstract

The crystallization behavior of PEOs with molecular weight of 10k and 200k as well as their blends was studied in details. The results show that the lower molecular weight PEO crystallizes with faster crystallization rate as judged from a shorter time for completing the crystallization. On the other hand

the higher molecular weight PEO crystallizes at relatively higher temperature

indicating an early start of crystallization compared with the lower molecular weight one. The blends of these two PEOs with different blend ratios always cocrystallize during the cooling processes. It is confirmed that mixing of the 10k PEO with the 200k one is in favor of the crystallization of the system. This is not only demonstrated by the early start of the crystallization at higher crystallization temperature

and also a faster crystal growth of the blend with respect to the 200k PEO. The crystallization of the blends at higher temperature is caused by an early start of nucleation and an increment of nucleus density. This may originate from the density fluctuation of the blend and a reduction in energy barrier for nucleation. Moreover

it is found that the crystallinity of the 10k PEO rich blends increases with increasing concentration of the 10k PEO. This is caused by the solvent effect of the 10k PEO toward the 200k PEO. On the other hand

the crystallinity of the 30/70 (10k/200k) PEO blend is decreased a little bit. This may be a balanced result of the improved crystallization of the 200k PEO at the expense of the high crystallization ability of the 10k PEO.

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