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Capacitance-based non-destructive testing of three-dimensionally printed polymer.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Capacitance-based non-destructive testing of three-dimensionally printed polymer./
作者:	Gundrati, Naga Bharath.
面頁冊數:	1 online resource (21 pages)
附註:	Source: Masters Abstracts International, Volume: 56-03.
Contained By:	Masters Abstracts International56-03(E).
標題:	Mechanical engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9781369593617

Capacitance-based non-destructive testing of three-dimensionally printed polymer.
Gundrati, Naga Bharath.

Capacitance-based non-destructive testing of three-dimensionally printed polymer. - 1 online resource (21 pages)

Source: Masters Abstracts International, Volume: 56-03.

Thesis (M.S.)

Includes bibliographical references

Three-dimensional (3D) printing involves layer-by-layer deposition of a material. The length of a molecule is typically large compared to the thickness of a printed layer. As a consequence, a degree of alignment of the molecules in the plane of a layer is expected. The effects of the printing conditions on the molecular structure (molecular alignment) of 3D printed polymer are reported for the first time, as shown by the electric permittivity perpendicular to the layers printed by bottom-up stereolithography, using a UV-curable acrylate ester resin. The relative permittivity (4.1-4.3) increases slightly with decreasing layer thickness (50-25 microm), due to the increased molecular alignment when the layer thickness decreases. All values are higher than the value (3.5) for the bulk polymer. The permittivity decreases with increasing curing time, due to the networking and the consequent decrease in molecular alignment. It decreases with increasing light intensity, due to the increase in the degree of curing. Increase in the resin age prior to printing increases the permittivity, due to the age hindering curing. The permittivity decreases with increasing aging time after printing, due to the post-curing; the decrease is more pronounced when the layer thickness is larger, because of the greater difficulty of curing a thicker layer and the consequent greater effect of post-curing. The low degree of molecular alignment obtained after 3 h of aging for a large layer thickness of 50 microm is similar to that of the bulk polymer, as indicated by the similarity in the relative permittivity. The technique reported here may be used for sensing the condition of 3D printed polymer structures without the use of attached or embedded sensors.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369593617Subjects--Topical Terms:

557493
Mechanical engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Capacitance-based non-destructive testing of three-dimensionally printed polymer.
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504 $a Includes bibliographical references
520 $a Three-dimensional (3D) printing involves layer-by-layer deposition of a material. The length of a molecule is typically large compared to the thickness of a printed layer. As a consequence, a degree of alignment of the molecules in the plane of a layer is expected. The effects of the printing conditions on the molecular structure (molecular alignment) of 3D printed polymer are reported for the first time, as shown by the electric permittivity perpendicular to the layers printed by bottom-up stereolithography, using a UV-curable acrylate ester resin. The relative permittivity (4.1-4.3) increases slightly with decreasing layer thickness (50-25 microm), due to the increased molecular alignment when the layer thickness decreases. All values are higher than the value (3.5) for the bulk polymer. The permittivity decreases with increasing curing time, due to the networking and the consequent decrease in molecular alignment. It decreases with increasing light intensity, due to the increase in the degree of curing. Increase in the resin age prior to printing increases the permittivity, due to the age hindering curing. The permittivity decreases with increasing aging time after printing, due to the post-curing; the decrease is more pronounced when the layer thickness is larger, because of the greater difficulty of curing a thicker layer and the consequent greater effect of post-curing. The low degree of molecular alignment obtained after 3 h of aging for a large layer thickness of 50 microm is similar to that of the bulk polymer, as indicated by the similarity in the relative permittivity. The technique reported here may be used for sensing the condition of 3D printed polymer structures without the use of attached or embedded sensors.
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