What question did this study set out to answer?

To determine how molecular weight and regioregularity influence the polymorphic crystal structures and mesomorphic phase transitions of poly(3-decylthiophenes).

December 1, 1997Macromolecules

Influence of Molecular Weight and Regioregularity on the Polymorphic Behavior of Poly(3-decylthiophenes)

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Authors

SMStefano V. MeillePolitecnico di Milano VRValeria RomitaNagoya Industrial Science Research Institute TCTullio CaronnaUniversity of Bergamo

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Implication

Structural analysis reveals that high molecular weight and regioregularity stabilize polymorph form I in poly(3-decylthiophenes), suggesting chain structure dictates crystal packing.

Key Points

To determine how molecular weight and regioregularity influence the polymorphic crystal structures and mesomorphic phase transitions of poly(3-decylthiophenes).
Prepared thin films of poly(3-decylthiophenes) varying in molecular mass and structural regioregularity.
Characterized crystalline polymorphs (form I and form II), chain orientations, and phase transitions above 70–80 °C using diffraction patterns and morphological observations.
High molecular weight and high regioregularity favored polymorph form I with edge-on main chains, substantially extending the thermal stability of the 2D mesomorphic phase above 70–80 °C.
Low-molecular-weight polymers preferentially formed polymorph form II with a weakly ordered, likely monodimensional mesophase and mutually orthogonal long-axis directions compared to form I.
Side-chain interdigitation remained unlikely across both form I and form II polymorphs.

Cite This Study

Meille et al. (1997) studied this question.

synapsesocial.com/papers/6a8a78fc06e1858e55de8f6a https://doi.org/10.1021/ma970655t

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Implication

Structural analysis reveals that high molecular weight and regioregularity stabilize polymorph form I in poly(3-decylthiophenes), suggesting chain structure dictates crystal packing.

Influence of Molecular Weight and Regioregularity on the Polymorphic Behavior of Poly(3-decylthiophenes)

Discussion

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Implication

Key Points

Cite This Study

Influence of Molecular Weight and Regioregularity on the Polymorphic Behavior of Poly(3-decylthiophenes)

Discussion

Member takes

Implication

Key Points

Cite This Study

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