Journal of Polymers and the Environment

, Volume 26, Issue 8, pp 3511–3519 | Cite as

Impact of Molecular Weight on the Thermal Stability and the Miscibility of Poly(ε-caprolactone)/Polystyrene Binary Blends

  • Al MamunEmail author
  • S. M. Mujibur Rahman
  • Sébastien Roland
  • Rizwan Mahmood
Original Paper


Poly(ε-caprolactone) (PCL) and two different molecular weight (6K and 650K) of polystyrene (PS) were mixed in solution to prepare binary blends of PCL/PS with various compositions. The impact of the molecular weight of PS in the blends was studied on thermal stability and miscibility by the thermogravimetric analysis (TGA) and the differential scanning calorimetry (DSC) method. The TGA results under dynamic conditions in an inert atmosphere show that the thermal stability of the blends depends on the length of PS molecules. The increase of the low molecular weight PS into the PCL/PS blend reduces the thermal stability while the high molecular weight PS improves the thermal stability. The crystallization peak temperature, enthalpy, and crystallinity of the blends are found molecular weight dependent; these parameters with blend compositions deviate from linearity of additive law for low molecular weight PS, while they do follow the additive law for high molecular weight PS. A significant melting point depression of PCL crystals with composition was observed for the blends with the incorporation of the low molecular weight PS, while the no significant melting temperature depression was observed for the high molecular weight PS. The experimental results clearly indicate that in the PCL/PS blends, the thermal stability and the interaction between the neat components strongly depend on the molecular weight of the PS.


Poly(ε-caprolactone) Polystyrene Molecular weight effect Miscibility Thermal stability 



The authors are grateful to the Chemistry Department, Sultan Qaboos University (SQU), Oman for the experimental facilities. One of the authors (Al Mamun) would like to thanks the Department of Physics of the SQU for hosting him as a Visiting Faculty during which this work has been completed.

Supplementary material

10924_2018_1236_MOESM1_ESM.docx (37 kb)
Supplementary material 1 (DOCX 36 KB)


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Al Mamun
    • 1
    Email author
  • S. M. Mujibur Rahman
    • 1
  • Sébastien Roland
    • 2
  • Rizwan Mahmood
    • 3
  1. 1.Department of Physics, College of ScienceSultan Qaboos UniversityMuscatOman
  2. 2.PIMM, ENSAM/CNRS/CNAM, UMR 8006ParisFrance
  3. 3.Department of Physics and EngineeringSlippery Rock UniversitySlippery RockUSA

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