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Crystal structure and morphology of poly(12-dodecalactone)
Eunju Kim1, Hiroshi Uyama, Yoshiharu Doi
1Department of Polymer Science and Engineering, Pusan National University, Pusan 609-735, Korea.
Biomacromolecules
|March 15, 2005
Summary
Poly(12-dodecalactone) (PDDL) crystals exhibit an orthorhombic structure with antiparallel chains. This study details their molecular packing and conformation using advanced microscopy and diffraction techniques.
Area of Science:
- Polymer Science
- Crystallography
- Materials Science
Background:
- Poly(12-dodecalactone) (PDDL) is a polyester with potential applications in biodegradable materials.
- Understanding the crystalline structure of PDDL is crucial for tailoring its material properties.
Purpose of the Study:
- To elucidate the crystal structure and molecular packing of PDDL lamellae.
- To determine the space group, lattice constants, and chain arrangement of PDDL crystals.
Main Methods:
- Isothermal crystallization from 1-hexanol solution.
- Transmission electron microscopy (TEM) and atomic force microscopy (AFM) for morphology.
- Wide-angle X-ray diffraction (WAXS) for structural analysis.
- Energy calculations for molecular packing refinement.
Main Results:
- PDDL crystallizes in an orthorhombic form (P2(1)2(1)2(1)) with specific lattice constants.
- Chains are arranged in an antiparallel manner within the unit cell.
- A detailed molecular packing model was established, validated by diffraction and energy calculations.
Conclusions:
- The study provides a comprehensive structural model for PDDL crystals.
- The findings contribute to the understanding of aliphatic polyesters' crystallization behavior.
- This structural data can guide the design of PDDL-based materials.