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Interfacial micromechanics of natural cellulose whisker polymer nanocomposites using raman spectroscopy.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Interfacial micromechanics of natural cellulose whisker polymer nanocomposites using raman spectroscopy./
作者:	Rusli, Rafeadah.
面頁冊數:	1 online resource (228 pages)
附註:	Source: Dissertations Abstracts International, Volume: 79-11, Section: C.
Contained By:	Dissertations Abstracts International79-11C.
標題:	Materials science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=U565277click for full text (PQDT)
ISBN:	9781073926152

Interfacial micromechanics of natural cellulose whisker polymer nanocomposites using raman spectroscopy.
Rusli, Rafeadah.

Interfacial micromechanics of natural cellulose whisker polymer nanocomposites using raman spectroscopy. - 1 online resource (228 pages)

Source: Dissertations Abstracts International, Volume: 79-11, Section: C.

Thesis (Ph.D.)--The University of Manchester (United Kingdom), 2011.

Includes bibliographical references

Raman spectroscopy has been used to monitor the deformation of natural cellulose whisker polymer nanocomposites. Cotton and tunicate whiskers were used as reinforcements in polymer matrices. Raman spectra from the nanocomposites highlight an intense band located at the 1095 cm-1 position. This band is reported to shift towards a lower wavenumber under the application of tensile deformation. On the other hand, the compressive deformation of the composite gives rise to an increase in the position of this Raman band. The shifts correspond to the direct deformation of the molecular backbone of cellulose, which is dominated by a C-O stretching mode. The Raman band located at 1095 cm-1 is shown to shift non-linearly before it reaches a plateau due to the breakdown of the whisker-matrix interface. The initial shift rate is associated with the stiffness of the cellulose whiskers. The stiffnesses of single whiskers of cotton and tunicate are found to be 58 and 155 GPa respectively, assuming two dimensional (2D) in-plane distribution of whiskers. Cyclic deformation tests of the composites provide an insight into understanding the behaviour of the whisker-polymer matrix interface under tension and compression. It is found that residual compressive stress occurs during each cycle of the deformation. The level of disruption at the whisker-matrix interface is determined by estimating the energy dissipation, which is proportional to the hysteresis area. Local orientation is also observed in the nanocomposites produced by solution casting and subsequent melt pressing. Dark regions of the composites viewed under a polarised optical microscopy are found to represent areas in which the cellulose whiskers form a randomly oriented whisker network. A shift rate for the Raman band initially located at 1095 cm-1 obtained in the dark regions of 12.2 vol% tunicate whisker poly(vinyl acetate) nanocomposites is found to be -0.5±0.07 cm-1%-1, which is lower than -1.2±0.04 cm-1%-1 from the bright regions. Exposure to water and temperature during the deformation of the nanocomposites results in significant changes in stress transfer between the whiskers and the matrix. It is shown that the interface can be "switched-off" for the poly(vinyl acetate)/whisker system in the presence of water and also at temperature above the glass transition.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9781073926152Subjects--Topical Terms:

543314
Materials science.
Index Terms--Genre/Form:

542853
Electronic books.

Interfacial micromechanics of natural cellulose whisker polymer nanocomposites using raman spectroscopy.
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100 1 $a Rusli, Rafeadah. $3 3698534
245 1 0 $a Interfacial micromechanics of natural cellulose whisker polymer nanocomposites using raman spectroscopy.
264 0 $c 2011
300 $a 1 online resource (228 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: Dissertations Abstracts International, Volume: 79-11, Section: C.
500 $a Publisher info.: Dissertation/Thesis.
502 $a Thesis (Ph.D.)--The University of Manchester (United Kingdom), 2011.
504 $a Includes bibliographical references
520 $a Raman spectroscopy has been used to monitor the deformation of natural cellulose whisker polymer nanocomposites. Cotton and tunicate whiskers were used as reinforcements in polymer matrices. Raman spectra from the nanocomposites highlight an intense band located at the 1095 cm-1 position. This band is reported to shift towards a lower wavenumber under the application of tensile deformation. On the other hand, the compressive deformation of the composite gives rise to an increase in the position of this Raman band. The shifts correspond to the direct deformation of the molecular backbone of cellulose, which is dominated by a C-O stretching mode. The Raman band located at 1095 cm-1 is shown to shift non-linearly before it reaches a plateau due to the breakdown of the whisker-matrix interface. The initial shift rate is associated with the stiffness of the cellulose whiskers. The stiffnesses of single whiskers of cotton and tunicate are found to be 58 and 155 GPa respectively, assuming two dimensional (2D) in-plane distribution of whiskers. Cyclic deformation tests of the composites provide an insight into understanding the behaviour of the whisker-polymer matrix interface under tension and compression. It is found that residual compressive stress occurs during each cycle of the deformation. The level of disruption at the whisker-matrix interface is determined by estimating the energy dissipation, which is proportional to the hysteresis area. Local orientation is also observed in the nanocomposites produced by solution casting and subsequent melt pressing. Dark regions of the composites viewed under a polarised optical microscopy are found to represent areas in which the cellulose whiskers form a randomly oriented whisker network. A shift rate for the Raman band initially located at 1095 cm-1 obtained in the dark regions of 12.2 vol% tunicate whisker poly(vinyl acetate) nanocomposites is found to be -0.5±0.07 cm-1%-1, which is lower than -1.2±0.04 cm-1%-1 from the bright regions. Exposure to water and temperature during the deformation of the nanocomposites results in significant changes in stress transfer between the whiskers and the matrix. It is shown that the interface can be "switched-off" for the poly(vinyl acetate)/whisker system in the presence of water and also at temperature above the glass transition.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Materials science. $3 543314
650 4 $a Polymers. $3 535398
650 4 $a Tensile strength. $3 3564816
650 4 $a Cotton. $3 865960
650 4 $a Spectrum analysis. $3 520440
650 4 $a Nanocomposites. $3 2142179
650 4 $a Intellectual property. $3 572975
650 4 $a Cellulose. $3 588995
650 4 $a Thermogravimetric analysis. $3 3681837
650 4 $a Sulfuric acid. $3 1641667
650 4 $a Copyright. $3 601694
650 4 $a Energy dissipation. $3 619627
650 4 $a Silicon wafers. $3 3681738
650 4 $a Stress-strain curves. $3 3560389
650 4 $a Epoxy resins. $3 660191
650 4 $a Deformation. $2 lcstt $3 3267001
650 4 $a Scanning electron microscopy. $3 551366
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0794
690 $a 0513
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a The University of Manchester (United Kingdom). $3 3422292
773 0 $t Dissertations Abstracts International $g 79-11C.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=U565277 $z click for full text (PQDT)