Evaluation of interfacial region of microphase-separated SEBS using modulated differential scanning calorimetry and dynamic mechanical thermal analysis

Nireeksha S. Karode, Anup Poudel, Laurence Fitzhenry, Siobhán Matthews, Philip R. Walsh, Austin B. Coffey

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

The continuous structural changes of Poly(styrene-b-ethylene-butylene-b-styrene) [SEBS] due to the effect of temperature are hard to evaluate using conventional differential scanning calorimetry (DSC). This paper presents an accurate and simple way to evaluate microstructural and glass transitions of SEBS using modulated differential scanning calorimetry (MDSC). The weak crystalline nature of –(CH2-CH2)–n in the ethylene-butylene (EB) block melted around 36 °C. The premature molecular moment and Tg of the styrene block were at 62 °C and 96 °C, respectively. The interfacial region at high temperature was explained with respect to order-order transition (OOT) at 144 °C and a prominent Order-Disorder Transition (ODT) at around 202 °C. Dynamic mechanical thermal analysis (DMTA) and dynamic mechanical rheological testing (DMRT) measurements also revealed that the Tg of the PS transition were consistent at around 96 °C.

Original languageEnglish
Pages (from-to)268-277
Number of pages10
JournalPolymer Testing
Volume62
DOIs
Publication statusPublished - Sep 2017

Keywords

  • Glass transition
  • Non-reversing heat capacity
  • Reversing heat capacity
  • Tan delta

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