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Thermoplastic Dynamic Vulcanizates with In Situ Synthesized Segmented Polyurethane Matrix.

Andrea Kohári1, István Zoltán Halász2, Tamás Bárány3

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Summary

The optimal processing temperature for thermoplastic dynamic vulcanizates (TDVs) is 125 °C, yielding materials comparable to commercial products. These TDVs exhibit phase separation and reversible agglomeration of rubber particles within the thermoplastic polyurethane matrix.

Keywords:
TDVTPUin situ produced matrixthermoplastic dynamic vulcanizatesthermoplastic polyurethane

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Area of Science:

  • Polymer Science
  • Materials Science

Background:

  • Thermoplastic polyurethanes (TPUs) are versatile polymers with tunable properties.
  • Thermoplastic dynamic vulcanizates (TDVs) offer a unique combination of thermoplastic processability and elastomeric performance.
  • Developing TDVs with improved interfacial adhesion and controlled morphology is crucial for advanced applications.

Purpose of the Study:

  • To investigate the properties of TPUs polymerized in situ and their use as matrix polymers for TDVs.
  • To explore the effect of different rubber types (NBR, XNBR, ENR) and processing conditions on TDV properties.
  • To enhance the interfacial connection between the rubber phase and the TPU matrix through in situ synthesis.

Main Methods:

  • In situ synthesis of TPU matrix during dynamic vulcanization in an internal mixer.
  • Utilizing NBR, XNBR, and ENR as the rubber phase.
  • Characterization using tensile testing, DMTA, AFM, SEM, and DSC.

Main Results:

  • The optimal processing temperature for TDV production was determined to be 125 °C.
  • AFM indicated phase separation within the TPU matrix and even rubber phase distribution.
  • SEM revealed rubber particle agglomeration forming a quasi-continuous phase, reversibly broken by heat/shear.
  • The produced TDVs demonstrated mechanical properties comparable to commercial TDVs of similar hardness.

Conclusions:

  • Processing temperature significantly impacts TDV properties, with 125 °C being optimal.
  • The in situ synthesis approach allows for controlled morphology and potentially improved interfacial interactions.
  • The resulting TDVs exhibit promising mechanical performance suitable for various applications.