Influences of Carboxyl Methyl Celluloseon Performances of Mortar

Carboxyl methyl cellulose （CMC） was mixed into mortar to improve the waterretention performance of mortar, the quality of floated coat of aerated concrete became better. The consistency and compression strength of mortar with CMC were studied. The water absorption was studied with the method of filter paper. The micro mechanism was researched with X-ray diffraction and scanning electron microscopy（SEM）. The experimental results show the water-holding performance of mortar with CMC is largely improved and it is better when the mixed amount is about 1.5%; the compression strength had a descending trend with the increase of CMC; CMC reacted with calcium hydroxide（CH） into the deposition of calcium carboxyl methyl cellulose.

Preparation of Carboxymethyl Cellulose Fibers

Carboxymethyl cellulose(CMC) fibers were produced by extruding the CMC solution into the metal salt coagulation bath and collected with a winding machine.It was found that copper chloride,ferric chloride,cerium chloride,lanthanum chloride and aluminum nitrate solution could be used as coagulation bath to prepare CMC fibers,whereas the metal salt solutions,such as nickel chloride,zinc chloride,calcium chloride and magnesium chloride,could not.The fiber formation is due to the coordination between the carboxylates of CMC and metal ion.Fourier transform infrared spectroscopy(FTIR) was applied to studying the coordination mode of CMC and metal ion.The metal salt concentration,pH value and temperature of the coagulation bath affect the tenacity and elongation of the fiber.CMC fibers show good water uptake ability and can adsorb water more than 200% of its own weight.The mechanical behaviors of CMC fiber show dependence on environment humidity.

Study on Recycling Garments Wastage as an Alternative Sizing Material

This paper deals with garments wastage, which could proficiently assess alternative sizing materials than conventional sizing materials. In this research, the synthesized Carboxymethyl Cellulose (CMC) was originated from garments wastages and after that, synthesized CMC and exported CMC were added in sizing recipe for newly sized yarn and conventionally sized yarn respectively. Yarn count, strength, CSP, desizing efficiency and dye absorbency have been evaluated and a comparison has been made among the samples. Less count variation was found in newly sized yarn and a desirable amount of strength & CSP were also acquired in newly sized yarn but it was slightly less than the conventional one. After desizing and dye absorbency test, it has shown a favorable character for further steps like dyeing, printing, etc. These findings convey that synthesized CMC prepared from garments wastage in this study are good candidates for alternative sizing agents.

Effects of molecular weight and concentration of carboxymethyl cellulose on morphology of hydroxyapatite nanoparticles as prepared with one-step wet chemical method

Nano-sized apatite particles （nAP） synthesized with carboxymethyl cellulose （CMC） have shown great application potentials in in situ heavy metal remediation. However, differences in CMC＇s properties effects on the size of nAP produced are not well understood. In this paper, two types of CMC, with respective molecular weights （MW） of-120000 and -240000 Dalton or respective polymerization degrees of 500 （CMC-500） and 1050 （CMC-1050）, were studied in a concentration range of 0.05%-0.5% （w/w） for nAP synthesis. Morphology of the particles was characterized with transmission electron microscopy （TEM）. Results showed that 0.05% CMC- 500 solution gave an average particle size o f 148.7 -4-134.9 rim, 0.25% CMC-500 solution produced particles of 21.8~20.4nm, and, 0.5% CMC-500 solution contained particles of 15.8-4-7.7nm. In comparison, 0.05% CMC- 1050 solution produced nanoparticles of 6.8~3.2 rim, 0.25% CMC-1050 produced smaller nAP of 4.3-1-3.2 nm, and 0.5% CMC-1050 synthesized the smallest nanoparti- cles in this study, with an average diameter of 3.0~2.1 nm. Chemical composition of the products was identified with X-ray diffraction （XRD） as pure hydroxyapatite. Interac- tions between nAP and CMC were discussed with help of attenuated total reflection Fourier transform infrared （ATR- FTIR） spectroscopic data. This study showed that CMC at higher concentration as well as higher MW facilitated to produce finer nanoparticles, showing that nAP size could be manipulated by selecting appropriate CMC MW and/or applying appropriate CMC concentration.