(a) CP/MAS
13 C NMR
C6 62.6 ppm gg
NOC
C6 62.0 ppm gg
C6
Amorphous Cell.
CF11
65 ppm tg
Intensity (a.u.)
80
75
70
65
60
55
50
ppm
(b) WAXD
Equatorial
Meridional
(B)
(B)
(A)
(A)
5
15
25
35 10 20 30 40 50 60 70 80
2θ (degree)
2θ (degree)
Figure 6.5
122
Bacterial Cellulose
Figure 6.5
Characterization. of. NOC:. (a). CP/MAS. 13 C. NMR. spectra. of. NOC,. amorphous. cellulose,. and.
native.cellulose.powder.(Whatman.CF11);.(b).WAXD.photograph.of.NOC.together.with.equatorial.(left).and.meridional.(right).intensity.curves.of.the.WAXD.for.cellulose.II.fibers.(A).and.
NOC.(B)..The.term.“a.u.”.indicates.arbitrary.unit.
but.noncrystalline,.gives.a.totally.different.profile.for.the.meridional.scan,.
as. shown. in. Figure 6.5b.. More. reflections. were. found. in. the. meridional.
direction.when.compared.with.cellulose.II.crystals..The.characteristics.are.
considerable.line.broadening.of.the.individual.meridional.reflection.peaks.
in.the.WAXD.profile.of.NOC..This.indicates.that.the.structure.of.the.NOC.
film.along.the.chain.direction.may.have.a.certain.disorder.that.causes.the.
ordered,.but.noncrystalline.regions.(for.more.detail,.see.Kondo.2007)..Thus.
we.should.consider.the.states.of.the.structure.for.NOC.to.be.ordered.states.
that.are.neither.crystalline.nor.amorphous.
ventional.noncrystalline.cellulosics.have.no.orientation.in.their.supermolecular.structure,.and.it.is.difficult.to.avoid.recrystallization.in.water,.even.at.
13 C NMR
C6 62.6 ppm gg
NOC
C6 62.0 ppm gg
C6
Amorphous Cell.
CF11
65 ppm tg
Intensity (a.u.)
80
75
70
65
60
55
50
ppm
(b) WAXD
Equatorial
Meridional
(B)
(B)
(A)
(A)
5
15
25
35 10 20 30 40 50 60 70 80
2θ (degree)
2θ (degree)
Figure 6.5
122
Bacterial Cellulose
Figure 6.5
Characterization. of. NOC:. (a). CP/MAS. 13 C. NMR. spectra. of. NOC,. amorphous. cellulose,. and.
native.cellulose.powder.(Whatman.CF11);.(b).WAXD.photograph.of.NOC.together.with.equatorial.(left).and.meridional.(right).intensity.curves.of.the.WAXD.for.cellulose.II.fibers.(A).and.
NOC.(B)..The.term.“a.u.”.indicates.arbitrary.unit.
but.noncrystalline,.gives.a.totally.different.profile.for.the.meridional.scan,.
as. shown. in. Figure 6.5b.. More. reflections. were. found. in. the. meridional.
direction.when.compared.with.cellulose.II.crystals..The.characteristics.are.
considerable.line.broadening.of.the.individual.meridional.reflection.peaks.
in.the.WAXD.profile.of.NOC..This.indicates.that.the.structure.of.the.NOC.
film.along.the.chain.direction.may.have.a.certain.disorder.that.causes.the.
ordered,.but.noncrystalline.regions.(for.more.detail,.see.Kondo.2007)..Thus.
we.should.consider.the.states.of.the.structure.for.NOC.to.be.ordered.states.
that.are.neither.crystalline.nor.amorphous.
ventional.noncrystalline.cellulosics.have.no.orientation.in.their.supermolecular.structure,.and.it.is.difficult.to.avoid.recrystallization.in.water,.even.at.