9 research outputs found
Influence of Wax Content on Control and DMEU Crosslinked Cotton Fabrics
61-67<span style="font-size:12.0pt;line-height:115%;
font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">amples of a cotton poplin
fabric .at two stages of processing, viz. mercerize-scour (MS) and
mercerize-acour-peroxide bleach (MBBS) having nearly the same wax contents were
extracted with solvents to varying levels of comparable wax contents. These
were further treated with 150g/litre DMEU. Both control and DMEU crosslinked
fabrics were evaluated for various textile properties. From these evaluations
it is found that with decrease in wax content, absorbency improves, but
conditioned WRA, elongation at break, tear strength and flex abrasion of the
controls decreases. However, on crosslinking with DMEU no decrease in these properties
is observed. The overall performance profile shows that whereas resilience
scores of control and DMEU crosslinked
MS and MSB are almost unaffected with decrease in wax content, the strength-abrasion
scores show a decreasing trend more so in the case of controls then for DMEU crosslinked MS and MSB samples. </span
Studies on Chemically Modified Cotton Fabrics: Part IV-Physical Properties of DMEU Stripped Hydrocellulose and Hypochlorite Oxycellulose
7-13<span style="font-size:11.0pt;line-height:115%;
font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";color:black;mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Reduction in the
degree of polymerization (DPn) of a poplin fabric from 2300 to 350 was carried
out by two techniques, viz. (i) alkaline hypochlorite bleaching of
mercerized-scoured fabric (MS) to give hypochlorite Oxycelluloses, and (ii)
acid hydrolysis of mercerized-scoured-peroxide bleached fabric (MSB) to give
hydrocellulose. These were crosslinked with DMEU by the pad-dry-cure technique
using MgCl2<span style="font-size:11.0pt;line-height:115%;
font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";color:#0e0e0e;mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">.6H2O as catalyst
and further DMEU stripped through urea-phosphoric acid (UPac) hydrolysis. From
the study of the strength-abrasion properties of these treated fabrics it was
found that (i) the MSB sample undergoes less "total" loss as compared
to the MS sample on DMEU crosslinking<span style="font-size:11.0pt;
line-height:115%;font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;="" mso-fareast-font-family:"times="" new="" roman";mso-fareast-theme-font:minor-fareast;="" mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"times="" roman";="" color:#0e0e0e;mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:="" ar-sa"="">. <span style="font-size:11.0pt;line-height:115%;font-family:
" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";color:black;mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">However, the MSB
sample suffers greater <span style="font-size:11.0pt;line-height:115%;
font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";color:#0e0e0e;mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">"permanent" loss compared to the MS
sample and (ii) hydrocellulose undergo less "total" and
"permanent<span style="font-size:11.0pt;line-height:115%;
font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";color:#0e0e0e;mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">" losses compared to
hypochlorite Oxycelluloses at all DPn levels<span style="font-size:11.0pt;
line-height:115%;font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;="" mso-fareast-font-family:"times="" new="" roman";mso-fareast-theme-font:minor-fareast;="" mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"times="" roman";="" color:#0e0e0e;mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:="" ar-sa"="">. <span style="font-size:11.0pt;line-height:115%;font-family:
" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";color:black;mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">However, the Oxycelluloses possess
better strength-abrasion properties after DMEU crosslinking due to their higher
values at the unfinished stage as compared to the hydrocellulose.</span
Studies on Chemically Modified Cotton Fabrics: Part III-Chemical Properties of DMEU Stripped Hydrocellulose and Hypochlorite Oxycellulose
1-6<span style="font-size:11.0pt;line-height:115%;
font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";color:black;mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Two chemically
modified cotton fabrics, viz. (1) hydrocellulose and (2) hypochlorite
oxycellulose of degrees of polymerization (DPn) varying from 2300 to 350 were
subjected to (i) catalyst treatment using 20 g<span style="font-size:
11.0pt;line-height:115%;font-family:" calibri","sans-serif";mso-ascii-theme-font:="" minor-latin;mso-fareast-font-family:"times="" new="" roman";mso-fareast-theme-font:="" minor-fareast;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"times="" roman";="" color:#0f0f0f;mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:="" ar-sa"="">/litre MgCl26H2O,
(ii) DMEU finishing, (iii) urea-phosphoric acid (UPac) hydrolysis, and (iv)
DMEU stripping. Evaluation of changes in functional groups and DPn has shown
that catalyst treatment and UPac hydrolysis do not alter either the DPn or the
contents of various functional groups of the two chemically modified fabrics. DMEU finishing introduces
DMEU crosslinks. DMEU stripping by UPac hydrolysis causes a slight increase in
DPn values<span style="font-size:11.0pt;line-height:115%;font-family:
" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";color:#0f0f0f;mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">, but there is no change in
the contents of functional groups of hydrocellulose. Similar treatment of
hypochlorite oxycellulose causes reduction in DPn values and significant
increase in aldehyde and carboxyl group contents.</span
Studies on Chemically Modified Cotton Fabrics : Part I-Chemical and Physical Properties of Hydrocellulose and Peroxide and Hypochlorite Oxycelluloses
37-44<span style="font-size:11.0pt;line-height:115%;
font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">Three chemically modified
cotton fabrics, viz. hydrocellulose, peroxide oxycellulose and hypochlorite
oxycellulose having comparable DPn values in the range 1800-600 were prepared
and their chemical and physical characteristics were studied. From the
assessment of chemical properties, it is found that (i) hydrocellulose
possesses high contents of aldehyde groups, predominantly of the reducing type,
with low carboxyI and moderately high carbonyl groups, (ii) peroxide oxycellulose
possesses moderate contents of reducing aldehyde groups and moderately high
caboxyl and carbonyl groups, (iii) hypochlorite oxycellulose possesses very
high contents of carboxyl groups along with the high non-reducing type of
aldehyde groups and slightly low contents of carbonyl groups. The resilience
properties of these chemically modified cotton fabrics are comparable and are
also not affected by decrease in DPn value. Evaluation of strength-abrasion
properties at different DPn levels shows that cotton fabric modified with
sodium hypochlorite gives best performance at all DPn values, while the other
two are comparable, The rate of fall in the strength-abrasion properties with
decreasing DPn values is minimum for peroxide oxycellulose followed by
hypochlorite oxycellulose and maximum for hydro cellulose.</span