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Tuning the Diameter and Surface Prop...

Tan, Dawud Hertanto.

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Tuning the Diameter and Surface Properties of Meltblown Fibers.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Tuning the Diameter and Surface Properties of Meltblown Fibers./
Author:	Tan, Dawud Hertanto.
Description:	241 p.
Notes:	Source: Dissertation Abstracts International, Volume: 73-04, Section: B, page: 2363.
Contained By:	Dissertation Abstracts International73-04B.
Subject:	Chemical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3488265
ISBN:	9781267081490

Tuning the Diameter and Surface Properties of Meltblown Fibers.
Tan, Dawud Hertanto.

Tuning the Diameter and Surface Properties of Meltblown Fibers. - 241 p.

Source: Dissertation Abstracts International, Volume: 73-04, Section: B, page: 2363.

Thesis (Ph.D.)--University of Minnesota, 2011.

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

Melt blowing combines extrusion of molten polymer through small orifices with stretching of the hot extrudate by hot air jets thereby creating long fibers with small diameter, which randomly orient on a collector as a nonwoven mat. They contain fibers with an average diameter (d av) ≥ 1 mum, but nanofibers (i.e. dav < 1 mum) are desirable. Nonwovens with unique surface properties (e.g. hydrophobicity) for specific applications (e.g. filtration) also are desired.

ISBN: 9781267081490Subjects--Topical Terms:

560457
Chemical engineering.

Tuning the Diameter and Surface Properties of Meltblown Fibers.
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020 $a 9781267081490
035 $a (MiAaPQ)AAI3488265
035 $a AAI3488265
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100 1 $a Tan, Dawud Hertanto. $3 3174050
245 1 0 $a Tuning the Diameter and Surface Properties of Meltblown Fibers.
300 $a 241 p.
500 $a Source: Dissertation Abstracts International, Volume: 73-04, Section: B, page: 2363.
500 $a Advisers: Christopher W. Macosko; Frank S. Bates.
502 $a Thesis (Ph.D.)--University of Minnesota, 2011.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a Melt blowing combines extrusion of molten polymer through small orifices with stretching of the hot extrudate by hot air jets thereby creating long fibers with small diameter, which randomly orient on a collector as a nonwoven mat. They contain fibers with an average diameter (d av) ≥ 1 mum, but nanofibers (i.e. dav < 1 mum) are desirable. Nonwovens with unique surface properties (e.g. hydrophobicity) for specific applications (e.g. filtration) also are desired.
520 $a This thesis addresses nanofiber production with polypropylene (PP) and polybutylene terephthalate (PBT) by varying the air and polymer flow rates and combining the effects using Gamma, the ratio of air and polymer mass fluxes. Increasing Gamma: (1) decreases dav and increases the normalized width of diameter distribution (CV) for PBT and PP, (2) produces more broken uncollected fibers (flies) only with PBT, (3) produces irregularities (shots and ribbon-like fibers) for PP and PBT. PP shows rope irregularities at small Gamma..
520 $a Nanofibers were produced from low molecular weight (MW) polystyrene (PS), but with droplet irregularities. Blending low and high MW PS increases blend elasticity, which: (1) eliminates droplet irregularities, (2) decreases CV, (3) increases dav. The increase in d av can be alleviated by raising the air flow rate (&prop; Gamma ), in agreement with simulation.
520 $a Laval nozzle (a converging-diverging nozzle) was used for supersonic melt blowing (high Gamma values) with PBT. Experiment and simulation show that the nozzle: (1) increases the air velocity, (2) suppresses the oscillation in air velocity. Laval nozzle in supersonic melt blowing reduces dav by approximately 20% with no effect on CV, but doubles the flies generation.
520 $a More hydrophobic nonwovens were meltblown from a PBT/fluoropolymer blend but with shots formation. A hypothesis for shots formation was presented and experimentally corroborated. The meltblown fibers have island-in-the-sea structure (bundled nanofibers embedded in a microfiber) whose major phase can be removed to expose the nanofibers (dav ≈ 200 nm).
520 $a Finally, the appendices show preliminary works on: (1) free-radical grafting of a fluoropolymer with a reactive side-group, (2) mechanical properties of nonwoven and single fiber, (3) melt blowing of polycyclohexylethylene-polyethylene (CE) block copolymers.
590 $a School code: 0130.
650 4 $a Chemical engineering. $3 560457
650 4 $a Plastics. $3 649803
650 4 $a Nanotechnology. $3 526235
650 4 $a Materials science. $3 543314
690 $a 0542
690 $a 0795
690 $a 0652
690 $a 0794
710 2 $a University of Minnesota. $b Chemical Engineering. $3 1021870
773 0 $t Dissertation Abstracts International $g 73-04B.
790 $a 0130
791 $a Ph.D.
792 $a 2011
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3488265