Imperial College London

Professor Omar K. Matar

Faculty of EngineeringDepartment of Chemical Engineering

Vice-Dean (Education), Faculty of Engineering
 
 
 
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Contact

 

+44 (0)20 7594 9618o.matar Website

 
 
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Assistant

 

Miss Nazma Mojid +44 (0)20 7594 3918

 
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Location

 

506ACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Hennessy:2017:10.1039/C7SM01279A,
author = {Hennessy, M and Vitale, A and Matar, O and Cabral, JT},
doi = {10.1039/C7SM01279A},
journal = {Soft Matter},
pages = {9199--9210},
title = {Monomer diffusion into static and evolving polymer networks during frontal photopolymerisation},
url = {http://dx.doi.org/10.1039/C7SM01279A},
volume = {13},
year = {2017}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Frontal photopolymerisation (FPP) is a directional solidification process that converts monomer-rich liquid into crosslinked polymer solid by light exposure and finds applications ranging from lithography to 3D printing. Inherent to this process is the creation of an evolving polymer network that is exposed to a monomer bath. A combined theoretical and experimental investigation is performed to determine the conditions under which monomer from this bath can diffuse into the propagating polymer network and cause it to swell. First, the growth and swelling processes are decoupled by immersing pre-made polymer networks into monomer baths held at various temperatures. The experimental measurements of the network thickness are found to be in good agreement with theoretical predictions obtained from a nonlinear poroelastic model. FPP propagation experiments are then carried out under conditions that lead to swelling. Unexpectedly, for a fixed exposure time, swelling is found to increase with incident light intensity. The experimental data is well described by a novel FPP model accounting for mass transport and the mechanical response of the polymer network, providing key insights into how monomer diffusion affects the conversion profile of the polymer solid and the stresses that are generated during its growth. The predictive capability of the model will enable the fabrication of gradient materials with tuned mechanical properties and controlled stress development.
AU - Hennessy,M
AU - Vitale,A
AU - Matar,O
AU - Cabral,JT
DO - 10.1039/C7SM01279A
EP - 9210
PY - 2017///
SN - 1744-683X
SP - 9199
TI - Monomer diffusion into static and evolving polymer networks during frontal photopolymerisation
T2 - Soft Matter
UR - http://dx.doi.org/10.1039/C7SM01279A
UR - http://hdl.handle.net/10044/1/52182
VL - 13
ER -