Figure 12.9
252
Bacterial Cellulose
BNC
PAni
1:5
1:10
107
112
117
T/%
122
127
132
137
800
1300
1800
2300
2800
3300
3800
Wavenumber/cm
–1
Figure 12.9
Fourier.Transform.Infra-Red.Spectrometry-Attenuated.Total.Reflectance.(FTIR-ATR).of.BNC,.
PAni.and.composites.of.BNC/PAni.HCl,.as.prepared.with.different.proportions.of.BNC:Ani.
bonds.between.the.fiber.. agglomerates..This.is.in.accordance.with.Hu.et.al..
(2011),.where.BNC/PAni·HCl.composites.showed.weaker.mechanical.properties,.as.displayed.by.the.lower.values.of.the.tensile.strength.and.Young’s.
modulus.of.the.blends.
The.impregnation.of.the.BNC.fibers.with.PAni.was.confirmed.by.FTIR-ATR..
Spectra.were.recorded.with.a.Perkin-Elmer.Spectrum.One.IR.spectrometer.
within.the.range.between.4000.and.400/cm . at.ambient.temperature.at.a.resolution.of.8/cm.and.32.times.scanning..The.samples.(disks).were.first.pressed.
using.a.hydraulic.system.in.order.to.increase.the.analyzed.superficial.area..
Figure 12.9. compares. FTIR-ATR. spectra. of. BNC,. PAni,. and. composites. of.
BNC/PAni·HCl. as. prepared. with. different. proportions. of. BNC:Ani.. The.
stretching.vibration.corresponding.to.OH.groups.of.BNC.can.be.observed.at.
3300/cm.(due.to.the.stretching.vibration.of.OH.groups)..Stretching.vibration.
of. the. C–H. bond. in. the. BNC. pyranoid. ring. is. slightly. noticed. at. 2840/cm..
The.H–O–H.bending.of.absorbed.water.is.located.at.1614/cm..The.peak.at.
1494/cm.is.attributed.to.the.O–H.bending,.and.at.1136/cm.to.the.asymmetric.
bridge.stretching.of.C–O.bonds..The.strong.band.at.1040/cm.can.be.assigned.
to.the.C–O–C.pyranose.ring.skeletal.vibration.(Grande.et.al..2009;.Hu.et.al..
2011)..Figure 12.9.also.displays.a.typical.feature.of.pure.PAni..The.peaks.in.the.
tion.of.C–H.in.the.benzene.ring.of.PAni..In.comparison.to.BNC,.the.absorption.peak.at.3300/cm , .which.is.related.to.the.OH.groups,.is.shifted.to.3200/cm.
following.PAni.deposition.(at.1:5.and.1:10.BNC:Ani.molar.proportions),.with.
the. intensity. of. the. band. decreasing. following. PAni. polymerization.. This.
suggests.some.sort.of.hydrogen.bond.interaction.between.OH.groups.of.BNC.
252
Bacterial Cellulose
BNC
PAni
1:5
1:10
107
112
117
T/%
122
127
132
137
800
1300
1800
2300
2800
3300
3800
Wavenumber/cm
–1
Figure 12.9
Fourier.Transform.Infra-Red.Spectrometry-Attenuated.Total.Reflectance.(FTIR-ATR).of.BNC,.
PAni.and.composites.of.BNC/PAni.HCl,.as.prepared.with.different.proportions.of.BNC:Ani.
bonds.between.the.fiber.. agglomerates..This.is.in.accordance.with.Hu.et.al..
(2011),.where.BNC/PAni·HCl.composites.showed.weaker.mechanical.properties,.as.displayed.by.the.lower.values.of.the.tensile.strength.and.Young’s.
modulus.of.the.blends.
The.impregnation.of.the.BNC.fibers.with.PAni.was.confirmed.by.FTIR-ATR..
Spectra.were.recorded.with.a.Perkin-Elmer.Spectrum.One.IR.spectrometer.
within.the.range.between.4000.and.400/cm . at.ambient.temperature.at.a.resolution.of.8/cm.and.32.times.scanning..The.samples.(disks).were.first.pressed.
using.a.hydraulic.system.in.order.to.increase.the.analyzed.superficial.area..
Figure 12.9. compares. FTIR-ATR. spectra. of. BNC,. PAni,. and. composites. of.
BNC/PAni·HCl. as. prepared. with. different. proportions. of. BNC:Ani.. The.
stretching.vibration.corresponding.to.OH.groups.of.BNC.can.be.observed.at.
3300/cm.(due.to.the.stretching.vibration.of.OH.groups)..Stretching.vibration.
of. the. C–H. bond. in. the. BNC. pyranoid. ring. is. slightly. noticed. at. 2840/cm..
The.H–O–H.bending.of.absorbed.water.is.located.at.1614/cm..The.peak.at.
1494/cm.is.attributed.to.the.O–H.bending,.and.at.1136/cm.to.the.asymmetric.
bridge.stretching.of.C–O.bonds..The.strong.band.at.1040/cm.can.be.assigned.
to.the.C–O–C.pyranose.ring.skeletal.vibration.(Grande.et.al..2009;.Hu.et.al..
2011)..Figure 12.9.also.displays.a.typical.feature.of.pure.PAni..The.peaks.in.the.
tion.of.C–H.in.the.benzene.ring.of.PAni..In.comparison.to.BNC,.the.absorption.peak.at.3300/cm , .which.is.related.to.the.OH.groups,.is.shifted.to.3200/cm.
following.PAni.deposition.(at.1:5.and.1:10.BNC:Ani.molar.proportions),.with.
the. intensity. of. the. band. decreasing. following. PAni. polymerization.. This.
suggests.some.sort.of.hydrogen.bond.interaction.between.OH.groups.of.BNC.