Citation: 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 shu

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

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

Corresponding author: René Androsch, rene.androsch@iw.uni-halle.de
Received Date: 17 May 2019
Revised Date: 4 June 2019
Available Online: 26 July 2019

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% N,N-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.
- Crystallization,
- PLA,
- DEET,
- Liquid-liquid phase separation,
- Thermally-induced phase separation (TIPS)
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沈阳化工大学材料科学与工程学院沈阳 110142