Thermosetting Blends of Polybenzoxazine and Poly(ε-caprolactone): Phase Behavior and Intermolecular Specific Interactions

Zheng, S. X., Lu, H. and Guo, Q. P. (2004) Thermosetting Blends of Polybenzoxazine and Poly(ε-caprolactone): Phase Behavior and Intermolecular Specific Interactions. Macromolecular Chemistry And Physics, 205 11: 1547-1558. doi:10.1002/macp.200400054


Author Zheng, S. X.
Lu, H.
Guo, Q. P.
Title Thermosetting Blends of Polybenzoxazine and Poly(ε-caprolactone): Phase Behavior and Intermolecular Specific Interactions
Journal name Macromolecular Chemistry And Physics   Check publisher's open access policy
ISSN 1022-1352
Publication date 2004-07-28
Sub-type Article (original research)
DOI 10.1002/macp.200400054
Volume 205
Issue 11
Start page 1547
End page 1558
Total pages 12
Editor I Meisel
Place of publication Germany
Publisher Wiley - V C H Verlag GmbH & Co. KGaA
Collection year 2004
Language eng
Subject C1
291401 Polymers
670704 Plastics in primary forms
Abstract Polybenzoxazine (PBA-a)/poly(epsilon-caprolactone) (PCL) blends were prepared by an in situ curing reaction of benzoxazine (BA-a) in the presence of PCL. Before curing, the benzoxazine (BA-a)/PCL blends are miscible, which was evidenced by the behaviors of single and composition-dependant glass transition temperature and equilibrium melting point depression. However, the phase separation induced by polymerization was observed after curing at elevated temperature. It was expected that after curing, the PBA-a/PCL blends would be miscible since the phenolic hydroxyls in the PBA-a molecular backbone have the potential to form inter- molecular hydrogen-bonding interactions with the carbonyls of PCL and thus would fulfil the miscibility of the blends. The resulting morphology of the blends prompted an investigation of the status of association between PBA-a and PCL under the curing conditions. Although Fourier-transform infrared spectroscopy (FT-IR) showed that there were intermolecular hydrogen-bonding interactions between PBA-a and PCL at room temperature, especially for the PCL-rich blends, the results of variable temperature FT-IR spectroscopy by the model compound indicate that the phenolic hydroxyl groups could not form efficient intermolecular hydrogen-bonding interactions at elevated temperatures, i.e., the phenolic hydroxyl groups existed mainly in the non-associated form in the system during curing. The results are valuable to understand the effect of curing temperature on the resulting morphology of the thermosetting blends. SEM micrograph of the dichloromethane-etched fracture surface of a 90:10 PBA-a PCL blend showing a heterogeneous morphology.
Keyword Polymer Science
Intermolecular Specific Interactions
Phase Behavior
Polybenzoxazine
Poly (epsilon-caprolactone)
Thermosetting Blends
X-ray-scattering
Tetrafunctional Epoxy-resins
Ring-opening Polymerization
Mechanical-properties
Poly(ethylene Oxide)
Fracture-toughness
Semicrystalline Morphology
Crystallization Kinetics
Thermal-properties
Miscibility
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
2005 Higher Education Research Data Collection
 
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Created: Wed, 15 Aug 2007, 04:29:37 EST