東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Mechanical Behavior and Characteriza...

Esposito, Gabrielle .

Linked to FindBook

Google Book

Amazon

博客來

Mechanical Behavior and Characterization of SLS Processed PA-11 for PA-11/Silica Nanocomposites.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Mechanical Behavior and Characterization of SLS Processed PA-11 for PA-11/Silica Nanocomposites./
Author:	Esposito, Gabrielle .
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	204 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-09, Section: B.
Contained By:	Dissertations Abstracts International81-09B.
Subject:	Polymer chemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27667351
ISBN:	9781392574355

Mechanical Behavior and Characterization of SLS Processed PA-11 for PA-11/Silica Nanocomposites.
Esposito, Gabrielle .

Mechanical Behavior and Characterization of SLS Processed PA-11 for PA-11/Silica Nanocomposites. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 204 p.

Source: Dissertations Abstracts International, Volume: 81-09, Section: B.

Thesis (Ph.D.)--Lehigh University, 2020.

This item must not be sold to any third party vendors.

Selective laser sintering (SLS) continues to be a promising additive manufacturing process, in which three dimensional shapes are produced through laser sintering and resurfacing of a powder bed. The structural changes of a polyamide 11/carbon black (PA11/CB) powder during a UV-laser sintered printing process were analyzed to ultimately serve as a benchmark for a PA11/CB/SNP nanocomposite printed material. Samples printed with increasing laser area energy density were compared in terms of crystalinity, melt temperature, tensile behavior, essential work of fracture, density, molecular weight and amorphous chain rigidity. A molecular weight increase is found to occur in a stepwise fashion, with the tensile elongation, ultimate tensile strength, essential work of fracture and density following a similar behavior. X-ray diffraction revealed slight changes in dhkl spacing, which correlated well with slight melting peak shoulders shown in differential scanning calorimetry. Similar changes to the mobile amorphous phase were calculated suggesting partial metastable δ' crystal phase content due to unusual solidification. PA11/CB/SNP nanocomposite powder was developed with both 50 nm and 25 nm SNP. Both solid state shear pulverization and centrifugal mixing proved successful in powder blending. Powder flow measurements at increasing temperature have shown enhanced flow behavior at processing temperatures with increasing SNP. Increases in stiffness and strength as well as decreases in linear reciprocating wear suggest good reinforcement of particle layer boundaries, however brittle behaviour of the higher SNP loaded PA11/CB/SNP parts suggest diminished sintering. Ultimately, it was concluded that colloidal silica can be utilized to greatly change both powder flow and mechanical properties of a SLS printing powder, with these studies have providing a framework for the feasibility of processing and printing nanoparticle coated polymer powders.

ISBN: 9781392574355Subjects--Topical Terms:

3173488
Polymer chemistry.
Subjects--Index Terms:

Additive manufacturing

Mechanical Behavior and Characterization of SLS Processed PA-11 for PA-11/Silica Nanocomposites.
LDR:03183nmm a2200385 4500 001 2270183
005 20200921070748.5
008 220629s2020 ||||||||||||||||| ||eng d
020 $a 9781392574355
035 $a (MiAaPQ)AAI27667351
035 $a AAI27667351
040 $a MiAaPQ $c MiAaPQ
100 1 $a Esposito, Gabrielle . $3 3547552
245 1 0 $a Mechanical Behavior and Characterization of SLS Processed PA-11 for PA-11/Silica Nanocomposites.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 204 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-09, Section: B.
500 $a Advisor: Pearson, Raymond A.
502 $a Thesis (Ph.D.)--Lehigh University, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a Selective laser sintering (SLS) continues to be a promising additive manufacturing process, in which three dimensional shapes are produced through laser sintering and resurfacing of a powder bed. The structural changes of a polyamide 11/carbon black (PA11/CB) powder during a UV-laser sintered printing process were analyzed to ultimately serve as a benchmark for a PA11/CB/SNP nanocomposite printed material. Samples printed with increasing laser area energy density were compared in terms of crystalinity, melt temperature, tensile behavior, essential work of fracture, density, molecular weight and amorphous chain rigidity. A molecular weight increase is found to occur in a stepwise fashion, with the tensile elongation, ultimate tensile strength, essential work of fracture and density following a similar behavior. X-ray diffraction revealed slight changes in dhkl spacing, which correlated well with slight melting peak shoulders shown in differential scanning calorimetry. Similar changes to the mobile amorphous phase were calculated suggesting partial metastable δ' crystal phase content due to unusual solidification. PA11/CB/SNP nanocomposite powder was developed with both 50 nm and 25 nm SNP. Both solid state shear pulverization and centrifugal mixing proved successful in powder blending. Powder flow measurements at increasing temperature have shown enhanced flow behavior at processing temperatures with increasing SNP. Increases in stiffness and strength as well as decreases in linear reciprocating wear suggest good reinforcement of particle layer boundaries, however brittle behaviour of the higher SNP loaded PA11/CB/SNP parts suggest diminished sintering. Ultimately, it was concluded that colloidal silica can be utilized to greatly change both powder flow and mechanical properties of a SLS printing powder, with these studies have providing a framework for the feasibility of processing and printing nanoparticle coated polymer powders.
590 $a School code: 0105.
650 4 $a Polymer chemistry. $3 3173488
650 4 $a Mechanics. $3 525881
650 4 $a Materials science. $3 543314
653 $a Additive manufacturing
653 $a Colloidal silica
653 $a Fracture toughness
653 $a Polyamide 11
653 $a Polymer nanocomposite
653 $a Powder flow
690 $a 0495
690 $a 0794
690 $a 0346
710 2 $a Lehigh University. $b Polymer Science and Engineering. $3 2106405
773 0 $t Dissertations Abstracts International $g 81-09B.
790 $a 0105
791 $a Ph.D.
792 $a 2020
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27667351