國立虎尾科技大學 |

Morphology of Cellulose and Cellulose Blend Thin FilmsMorphology of cellulose and cellulose blend thin films.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Morphology of Cellulose and Cellulose Blend Thin FilmsMorphology of cellulose and cellulose blend thin films./
Author:	Lu, Rui.
Description:	1 online resource (71 pages)
Notes:	Source: Masters Abstracts International, Volume: 56-05.
Subject:	Materials science. -
Online resource:	click for full text (PQDT)
ISBN:	9780355060133

Morphology of Cellulose and Cellulose Blend Thin FilmsMorphology of cellulose and cellulose blend thin films.
Lu, Rui.

Morphology of Cellulose and Cellulose Blend Thin FilmsMorphology of cellulose and cellulose blend thin films. - 1 online resource (71 pages)

Source: Masters Abstracts International, Volume: 56-05.

Thesis (M.S.)--University of Maryland, College Park, 2017.

Includes bibliographical references

Cellulose is the most abundant, renewable, biocompatible and biodegradable natural polymer. Cellulose exhibits excellent chemical and mechanical stability, which makes it useful for applications such as construction, filtration, bio-scaffolding and packaging. It is useful to study amorphous cellulose as most reactions happen in the non-crystalline regions first and at the edge of crystalline regions. In this study, amorphous thin films of cotton linter cellulose with various thicknesses were spincoated on silicon wafers from cellulose solutions in dimethyl sulfoxide / ionic liquid mixtures. Optical microscopy and atomic force microscopy indicated that the morphology of as-cast films was sensitive to the film preparation conditions. A sample preparation protocol with low humidity system was developed to achieve featureless smooth films over multiple length scales from nanometers to tens of microns. X-ray reflectivity, X-ray diffraction, Fourier transform infrared spectroscopy and high resolution sum-frequency generation vibrational spectroscopy were utilized to confirm that there were no crystalline regions in the films. One- and three- layer models were used to analyze the X-ray reflectivity data to obtain information about roughness, density and interfacial roughness as a function of film thickness from 10-100nm. Stability tests of the thin films were conducted under harsh conditions including hot water, acid and alkali solutions. The stability of thin films of cellulose blended with the synthetic polymer, polyacrylonitrile, was also investigated. The blend thin films improved the etching resistance to alkali solutions and retained the stability in hot water and acid solutions compared to the pure cellulose films.

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

Mode of access: World Wide Web

ISBN: 9780355060133Subjects--Topical Terms:

557839
Materials science.
Index Terms--Genre/Form:

554714
Electronic books.

Morphology of Cellulose and Cellulose Blend Thin FilmsMorphology of cellulose and cellulose blend thin films.
LDR:02927ntm a2200325K 4500 001 914038
005 20180703084419.5
006 m o u
007 cr mn||||a|a||
008 190606s2017 xx obm 000 0 eng d
020 $a 9780355060133
035 $a (MiAaPQ)AAI10236952
035 $a (MiAaPQ)umd:17258
035 $a AAI10236952
040 $a MiAaPQ $b eng $c MiAaPQ
100 1 $a Lu, Rui. $3 1187111
245 1 0 $a Morphology of Cellulose and Cellulose Blend Thin FilmsMorphology of cellulose and cellulose blend thin films.
264 0 $c 2017
300 $a 1 online resource (71 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Masters Abstracts International, Volume: 56-05.
500 $a Adviser: Robert M. Briber.
502 $a Thesis (M.S.)--University of Maryland, College Park, 2017.
504 $a Includes bibliographical references
520 $a Cellulose is the most abundant, renewable, biocompatible and biodegradable natural polymer. Cellulose exhibits excellent chemical and mechanical stability, which makes it useful for applications such as construction, filtration, bio-scaffolding and packaging. It is useful to study amorphous cellulose as most reactions happen in the non-crystalline regions first and at the edge of crystalline regions. In this study, amorphous thin films of cotton linter cellulose with various thicknesses were spincoated on silicon wafers from cellulose solutions in dimethyl sulfoxide / ionic liquid mixtures. Optical microscopy and atomic force microscopy indicated that the morphology of as-cast films was sensitive to the film preparation conditions. A sample preparation protocol with low humidity system was developed to achieve featureless smooth films over multiple length scales from nanometers to tens of microns. X-ray reflectivity, X-ray diffraction, Fourier transform infrared spectroscopy and high resolution sum-frequency generation vibrational spectroscopy were utilized to confirm that there were no crystalline regions in the films. One- and three- layer models were used to analyze the X-ray reflectivity data to obtain information about roughness, density and interfacial roughness as a function of film thickness from 10-100nm. Stability tests of the thin films were conducted under harsh conditions including hot water, acid and alkali solutions. The stability of thin films of cellulose blended with the synthetic polymer, polyacrylonitrile, was also investigated. The blend thin films improved the etching resistance to alkali solutions and retained the stability in hot water and acid solutions compared to the pure cellulose films.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Materials science. $3 557839
650 4 $a Engineering. $3 561152
655 7 $a Electronic books. $2 local $3 554714
690 $a 0794
690 $a 0537
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a University of Maryland, College Park. $b Material Science and Engineering. $3 1182891
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10236952 $z click for full text (PQDT)