The jute. It is reported in the literature that

The
triclinic I? component is a rare component, whereas I? is the principal
portion. The metastable I? polymorph can be transformed into I? by hydrothermal
treatments in alkaline solution 29. The unit cell dimensions are observed from
table that the I? unit cell
the cell parameters are a = 8.05 Å, b = 10.36 Å, c = 8.01 Å and ? = 94.92?? for
root portion, a = 7.81 Å, b = 10.36 Å, c = 7.96 Å and ? = 93.57? for middle
portion and a = 7.80 Å, b = 10.33 Å, c = 8.04 Å and ? = 95.20? for tip portion
jute. It is reported in the literature that for I? cellulose samples have unit
cell dimensions are a = 7.784 Å , b = 8.201 Å , c = 10.380 Å , and ? = 96.55?,
the diffraction patterns patterns for Ib samples with preferred orientation
along the c-axis 30 .  The crystal size of
three portions of jute is calculated by using Scherrer equation, the crystal
size of root, middle and tip portion jute samples are 3.35 nm, 3.26 nm and 3.18
nm and 4.93 nm respectively. The crystallite size of the jute fibers;
the values are in the order: root > middle > tip
indicating higher rigidity of cellulose fibers and
decreasing crystallite surface corresponding to the
amorphous phase.  However, it is important
to mention that the crystallite size as calculated in most
literatures cannot provide much information regarding mechanical properties of
cellulosic fibres 31-32.   Further, the crystallinity
index of root, middle and tip portion jute are found to be 62.4, 64.6 and 65.1
respectively. The microfibriller angle of root, middle and tip portion jute are
observed to be 10.8?, 8.0? and 7.2? respectively. The
microfibriller angle is found to be decreased and crystalline index
is increased from root to tip portion of jute fibre.  Crystalinity index
and microfibriller angle play considerable role on mechanical properties of
cellulosic fibre. The tensile strength and modulus
of jute fibres have been proved to
be dependent on crystalinity index and microfibriller angle
i.e the orientation of the crystalline cellulose. Tensile strength and modulus
of jute fibre are inversely related to microfibriller angle and increases with
increase in crystallinity index. Cellulosic fibre selection for reinforcement
purpose the crystalinity index and microfibriller angle of fibre plays
important function on mechanical properties of composite 13.

3.2 FTIR Analysis of Three
Portion of Jute:

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The
chemical nature of the jute fibres was analyzed using FTIR and depicted in
Fig.2. FTIR spectrum of the jute shows chemical groups presence in the three
basic constituent component cellulose, hemicellulose and lignin 33.
A broad absorption band in the region 3600–3200 cm-1 for
three portions of jute is shown which associated with
the –OH stretching bond of the hydroxyl group of cellulose and
intra-hydrogen bond stretching of the absorbed water. The peaks at 2915, 2916
and 2918 cm-1 are responsible for the -CH stretching vibration from CH and CH2
in cellulose and hemicellulose components and the peaks at 1735, 1733 and 1732
cm-1  assigned to the carbonyl C=O stretching of carboxylic
acid in lignin or ester group in hemicelluloses. A little peak at 1507 and 1510
cm-1 are associated with the C=C stretching of aromatic ring of the
lignin. The absorbance at 1424, 1421 and 1422 cm-1 is due to the
presence of CH2 symmetric bending present in cellulose and lignin. The
absorbance peaks at 1368, 1367 and 1366 cm-1 correspond to the C–H
stretching vibration presence in cellulose and hemicellulose component,
respectively 34. The peak at 1157,
1156 and 1155 cm-1 is due to the anti-symmetrical
deformation of the C-O-C band. The strong peak at 1030, 1021 and 1020  cm-1
is attributed to the CO and O-H stretching vibration which associated to
polysaccharide in cellulose 35.