Mesophase Formation in Regioregular Poly(3-alkylthiophene)s Containing Long Chain Alkyl Groups

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• 作者：Yu Wang ; Nadia Archambault ; Allison M. Belcher ; Devin Busse ; David B. Damon ; Ashley Mills ; Amanda E. Riddle ; Ivan J. Samardjiev ; Brett L. Lucht ; William B. Euler
• 刊名：Macromolecules
• 出版年：2008
• 出版时间：October 14, 2008
• 年：2008
• 卷：41
• 期：19
• 页码：7115-7121
• 全文大小：273K
• 年卷期：v.41,no.19(October 14, 2008)
• ISSN：1520-5835

文摘

A series of regioregular poly(3-alkylthiophene)s with substituent groups R = C₂₂H₄₅, C₂₄H₄₉, C₂₆H₅₃, and C₂₈H₅₇ were synthesized. All of the materials can form a mesophase by rapid quenching from the isotropic melt. The ease of mesophase formation depends upon the length of the alkyl group, with the longer side chains leading to mesophase formation at lower quenching rates. Variable temperature reflection and fluorescence spectroscopy of thin films and differential scanning calorimetry and variable temperature X-ray diffraction on powders were used to study the thermal behavior of the new polymers. All of the materials studied showed a two-step thermochromic transition from the mesophase, and endotherms in the thermograms could be assigned to melting of each phase. The data indicate that π−π stacking is an important contributor to the thermochromism observed in these compounds while the interaction between the alkyl side chains controls mesophase formation.