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Polymers 2018, 10(3), 300; https://doi.org/10.3390/polym10030300

Orthogonal Templating Control of the Crystallisation of Poly(ε-Caprolactone)

1
Centre for Rapid and Sustainable Product Development, Institute Polytechnic of Leiria, 2430-028 Marinha Grande, Portugal
2
EMLAB, University of Reading, Reading RG6 6AF, UK
*
Author to whom correspondence should be addressed.
Received: 8 January 2018 / Revised: 27 February 2018 / Accepted: 2 March 2018 / Published: 11 March 2018
(This article belongs to the Special Issue Processing-Structure-Properties Relationships in Polymers)
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Abstract

The crystal growth of poly(ε-caprolactone) can be very effectively directed through the use of small amounts of dibenzylidene sorbitol in conjunction with modest flow fields to yield extremely high levels of the preferred polymer crystal orientation. We show that by introducing small quantities of a terpolymer, based on polyvinyl butyral we can switch the symmetry axis of the final lamellar orientation from parallel to perpendicular to the melt flow direction. During shear flow of the polymer melt, the dibenzylidene sorbitol forms highly extended nanoparticles which adopt a preferred alignment with respect to the flow field and on cooling, polymer crystallisation is directed by these particles. The presence of the terpolymer, based on polyvinyl butyral, limits the aspect ratio of the dibenzylidene sorbitol (DBS) particles, such that the preferred orientation of the particles in the polymer melt changes from parallel to normal to the flow direction. The alignment of lamellar crystals perpendicular to the flow direction has important implications for applications such as scaffolds for tissue engineering and for barrier film properties. View Full-Text
Keywords: crystallisation; morphology; nanoparticles; shear; flow; orientation; poly(ε-caprolactone); polyvinyl butyral crystallisation; morphology; nanoparticles; shear; flow; orientation; poly(ε-caprolactone); polyvinyl butyral
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Mitchell, G.R.; Olley, R.H. Orthogonal Templating Control of the Crystallisation of Poly(ε-Caprolactone). Polymers 2018, 10, 300.

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