Competition between Liquid-liquid De-mixing, Crystallization, and Glass Transition in Solutions of PLA of Different Stereochemistry and DEET

Chanita Sungkapreecha; Walter W. Focke; René Androsch

doi:10.1007/s10118-019-2314-0

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Competition between Liquid-liquid De-mixing, Crystallization, and Glass Transition in Solutions of PLA of Different Stereochemistry and DEET

ARTICLE | Updated：2019-07-26

- Competition between Liquid-liquid De-mixing, Crystallization, and Glass Transition in Solutions of PLA of Different Stereochemistry and DEET
- Chinese Journal of Polymer Science Vol. 38, Issue 2, Pages: 174-178(2020)
- Affiliations：
  
  a.Interdisciplinary Center for Transfer-oriented Research in Natural Sciences, Martin Luther University Halle-Wittenberg, 06099 Halle/Saale, Germany
  b.University of Pretoria Institute for Sustainable Malaria Control and MRC Collaborating Centre for Malaria Research, Department of Chemical Engineering, University of Pretoria, Private Bag X20, Hatfield 0028, South Africa
- Author bio：
  
  rene.androsch@iw.uni-halle.de
- Funds：
- DOI：10.1007/s10118-019-2314-0
  CLC：
- Received：17 May 2019，
  
  Revised：2019-6-4，
  
  Accepted：10 June 2019，
  
  Online First：26 July 2019，
  
  Published：2020-02
- Accepted：
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Citation: Sungkapreecha, C.; Focke, W. W.; Androsch, R. Competition between liquid-liquid de-mixing, crystallization, and glass transition in solutions of PLA of different stereochemistry and DEET. Chinese J. Polym. Sci. 2020, 38, 174–178

Chanita Sungkapreecha, Walter W. Focke, René Androsch. Competition between Liquid-liquid De-mixing, Crystallization, and Glass Transition in Solutions of PLA of Different Stereochemistry and DEET[J]. Chinese Journal of Polymer Science, 2020, 38(2): 174-178.
Citation: Sungkapreecha, C.; Focke, W. W.; Androsch, R. Competition between liquid-liquid de-mixing, crystallization, and glass transition in solutions of PLA of different stereochemistry and DEET. Chinese J. Polym. Sci. 2020, 38, 174–178 DOI： 10.1007/s10118-019-2314-0.

Chanita Sungkapreecha, Walter W. Focke, René Androsch. Competition between Liquid-liquid De-mixing, Crystallization, and Glass Transition in Solutions of PLA of Different Stereochemistry and DEET[J]. Chinese Journal of Polymer Science, 2020, 38(2): 174-178. DOI： 10.1007/s10118-019-2314-0.

摘要

Abstract

Liquid-liquid (L-L) de-mixing and vitrification of solutions of either crystallizable poly(L-lactic acid) (PLLA) or non-crystallizable poly(D/L-lactic acid) (PDLLA) with 50 m%

-diethyl-3-methylbenzamide (DEET) were analyzed by calorimetry and cloud-point measurements

which allows drawing conclusions about the effect of polymer stereochemistry on the phase behavior. Regardless of the PLA stereochemistry

vitrification of the solutions on fast cooling

hindering crystallization of PLLA

occurred below −20 °C and suppressed prior L-L de-mixing. The experimental results prove that crystallization in samples containing crystallizable PLLA

observed at around 55 °C on slow cooling

is not preceded by L-L de-mixing.

关键词

Keywords

references

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