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Optimization of Crystal Growth for Neutron Macromolecular Crystallography

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Regulation of the Phase Structure in the Crystallizing Curing System PCL-DGEBA.

Irina O Plyusnina¹, Uliana V Nikulova¹, Ramil R Khasbiullin¹

¹Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences (IPCE RAS), 31, Building 4 Leninsky Prospect, Moscow 119071, Russia.

|October 16, 2024

Summary

This study explores phase structure formation in polycaprolactone-epoxy resin systems. Researchers found that controlling curing temperature and concentration allows precise regulation of phase structure, size, and composition for optimized material properties.

Keywords:

DGEBA epoxy resin interdiffusion interpenetrating phases phase diagram phase reversal region phase structure polycaprolactone

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Area of Science:

Polymer Science
Materials Science
Chemical Engineering

Background:

Understanding phase structure formation is crucial for tailoring composite material properties.
Reactive thermoplastic systems offer tunable characteristics through controlled curing.

Purpose of the Study:

To investigate the qualitative and quantitative aspects of phase structure formation in polycaprolactone-epoxy resin/4,4'-diaminediphenylsulfone systems.
To establish a method for determining temperature-concentration parameters influencing phase structure.
To correlate structural features with curing conditions and operational properties.

Main Methods:

Phase diagram construction and evolution tracing with increasing epoxy group conversion.
Optical interferometry for determining temperature-concentration parameters.
Optical and scanning electron microscopy for studying phase structures and morphology.
FTIR spectroscopy and Differential Scanning Calorimetry (DSC) for phase composition analysis.

Main Results:

A phase diagram exhibiting amorphous separation with a lower critical solution temperature was constructed.
Methods were developed to determine parameters controlling phase structure type.
Dimensions of structural elements were correlated with curing temperature and concentration.
Phase composition was analyzed in detail.

Conclusions:

Varying temperature-concentration parameters during curing enables specific regulation of phase structure type, size, and composition.
This control directly influences the final operational properties of the composite materials.