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Polymorphic packing and dynamics of biodegradable poly(3-hydroxypropionate).

Bo Zhu¹, Weihua Kai, Pengju Pan

¹Department of Biomolecular Engineering, Tokyo Institute of Technology, 4259-B-55 Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan.

The Journal of Physical Chemistry. B

|July 19, 2008

Summary

Investigating poly(3-hydroxypropionate) (P3HP) crystal forms reveals distinct packing and dynamics. FTIR and NMR show varied molecular mobility, crucial for understanding P3HP biodegradability.

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Published on: December 23, 2013

Area of Science:

Polymer Science
Materials Science
Solid-State Chemistry

Background:

Poly(3-hydroxyalkanoate)s (PHAs) are biodegradable polymers with diverse applications.
Poly(3-hydroxypropionate) (P3HP) serves as a fundamental structural unit in many PHAs.
Understanding P3HP's polymorphic crystal structures is key to controlling its properties.

Purpose of the Study:

To investigate the packing and molecular dynamics of beta-, gamma-, and delta-P3HP crystal forms.
To correlate structural differences with material properties like biodegradability.
To elucidate the relationship between chain packing, intermolecular interactions, and molecular mobility.

Main Methods:

Variable-temperature Fourier-transform infrared (FTIR) spectroscopy.
Carbon-13 solid-state nuclear magnetic resonance (13C SSNMR) spectroscopy, including CP/MAS and spin-lattice relaxation time measurements.
Analysis of vibrational band shifts, splitting, and relaxation times to infer structure and dynamics.

Main Results:

FTIR revealed distinct intermolecular interactions and packing in beta-, gamma-, and delta-P3HP, with gamma- and delta-forms showing stronger interactions than beta-.
Temperature-dependent FTIR indicated a mesophase during gamma-P3HP melting and tight packing in delta-P3HP.
13C SSNMR and relaxation times demonstrated significant differences in molecular mobility, ranking as delta << gamma << beta.

Conclusions:

The three polymorphic crystal forms of P3HP exhibit unique packing arrangements and molecular dynamics.
Intermolecular interactions and chain packing directly influence molecular mobility.
These structure-property relationships are critical for understanding and tailoring the biodegradability of P3HP and related PHAs.