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Thermal Analysis of the Conformational Disorder in SCLC Polymers with Rigid Backbone Glass transition studies

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Abstract

Bis [(ω-(4′-cyanobiphenyl)-4-yl)oxy-n-alkyl]norborn-5-ene-2,3-dicarboxylate was polymerised via ring opening metathesis polymerisation (ROMP). Two disubstituted polynorbornene derivatives both of cis configuration with different length of the side-chain were studied. Differential scanning calorimetry (DSC) was used to study the effect of thermal history on the assignment of the glass transition event associated with the biaxial orientation of a smectic phase. Glass transition temperatures, the change of isobaric specific heats at Tg and the enthalpies of isotropisation were calculated. The DSC traces only show the classic step-wise change in Tg in some cases, giving the evidence that the amorphous domains are constrained and highly restricted in movement due to the morphology developed as a result of the biaxial stretching. Based on the literature data of mono- and disubstituted polynorbornene derivatives and our calorimetric experiments, the shape of Tg dependence on number of (CH2) units is interpreted. The origin of this shape is discussed.

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Authors and Affiliations

  1. Institute of Engineering Problems, Silesian University, Śnieżna 2, 41-200, Sosnowiec, Poland

    A. Danch

  2. Institut für Biophysik und Röntgenstrukturforschung, Austrian Academy of Sciences, Steyrergasse 17, A-8010, Graz

    K. Lohner

  3. Institut für Chemische Technologie organischer Stoffe, TU Graz, Stremayrgasse 16, A-8010, Graz, Austria

    M. Ungerank & F. Stelzer

Authors
  1. A. Danch
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  2. K. Lohner
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  3. M. Ungerank
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  4. F. Stelzer
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Danch, A., Lohner, K., Ungerank, M. et al. Thermal Analysis of the Conformational Disorder in SCLC Polymers with Rigid Backbone Glass transition studies. Journal of Thermal Analysis and Calorimetry 54, 161–170 (1998). https://doi.org/10.1023/A:1010177121068

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