Quantifying Crystallinity in High Molar Mass Poly(3-hexylthiophene)

Published

June 3, 2014

Author(s)

Chad R. Snyder, Ryan C. Nieuwendaal, Dean M. DeLongchamp, Christine K. Luscombe, Prakash Sista, Shane D. Boyd

Abstract

We extend a recent comprehensive study of 3-hexylthiophene oligomers to high molar mass poly(3-hexylthiophene) (P3HT) fractions, such as those used in organic photovoltaic devices. Through a combination of differential scanning calorimetry (DSC) and 13C nuclear magnetic resonance spectroscopy (NMR), we were able to quantify the enthalpy and melting temperature of P3HT samples with molar masses ranging from 3.6 kg/mol to 62 kg/mol. Our results are consistent with the results of the oligomer work, but we demonstrate that higher molar mass samples are needed to fully capture the curvature in the Form I crystal melting temperature data and improve the enthalpy extrapolation. Significant changes in the extrapolated values for the enthalpy of fusion needed for quantification of crystallinity and equilibrium melting temperature result from this improvement.

Citation

Macromolecules

Volume

47

Issue

12

Pub Type

Journals

Download Paper

https://doi.org/10.1021/ma500136d

Keywords

calorimetry, crystallinity, local order, NMR, semiconducting polymers

Citation

Snyder, C. , Nieuwendaal, R. , DeLongchamp, D. , Luscombe, C. , Sista, P. and Boyd, S. (2014), Quantifying Crystallinity in High Molar Mass Poly(3-hexylthiophene), Macromolecules, [online], https://doi.org/10.1021/ma500136d (Accessed April 20, 2024)