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Title: Additive manufacturing of functional materials for polymer micro reactors
Author: Singh, Jetinder
ISNI:       0000 0004 2736 922X
Awarding Body: University of Liverpool
Current Institution: University of Liverpool
Date of Award: 2012
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This work investigates the development of functional materials by using additive manufacturing techniques; specifically digital light processing (DLP) based Stereolithography to manufacture micro reactors containing functional materials for sensing and actuating devices in a single build. The envisionTEC Perfactory is a DLP based Stereolithography machine (addressed as the DLP system) and has the ability to manufacture feature size in the micron range with high precision. This ability to manufacture small features with high precision is used for the manufacture of polymer micro reactors. Using the DLP system for processing functional composites is a novel approach. The DLP system offers high resolution and accurate manufacture of parts. This ability to process functional materials will be used for developing devices for sensing and actuating applications. In order to identify the feasibility of manufacturing composite of the DLP system, barium titanate (BaTi03) ceramic was added to the photopolymer. The composites containing up to 19 vol% BaTi03 as functional material were manufactured by the DLP system. Poling these specimens showed a maximum piezoelectric coefficient of 5 pC/N, measured at 30 MV /m and 90°C. Measuring ferroelectric properties of these composite specimens showed a maximum remnant and saturation polarisation of ±0.041 IlC/cm2 and ±0.359 IlC/cm2, measured at electric field of 249.97 kV/cm at room temperature. As the parts were manufactured in layers; an investigation was undertaken to identify the effect of build layer orientation on the mechanical properties. The polymer specimens for the XY (horizontal) and the Z (vertical) build direction showed strength of 39 MPa and 29 MPa, being achieved in the respective specimen.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral