The Effect of pH on the Fluorescence Properties of Thermally Stable CMC/Eu Complexes

Wang, Ben; Ye, Jun; Xiong, Jian

doi:10.4028/www.scientific.net/AMR.1061-1062.141

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The Effect of pH on the Fluorescence Properties of Thermally Stable CMC/Eu Complexes

Abstract:

CMC/Eu complexes were synthesized in different pH values by reacting with Eu³⁺ and CMC, a kind of biodegradable polymer. FT-IR results confirmed that, on CMC chains, carboxyl groups and the oxygen atom of unsubstituted hydroxyl groups and ether bonds were all involved in the reaction with Eu³⁺. TG analysis showed that CMC/Eu complexes were thermally stable in a wide temperature range from 30 to 300°C. The emission intensity decreased when the pH value increased from 7.0 to 12.0. However, at pH=12, because that the extent of reaction of Eu³⁺ and CMC decreased and CMC degraded, the complexes had a weak fluorescence intensity.

Info:

Periodical:

Advanced Materials Research (Volumes 1061-1062)

Main Theme:

Research in Materials and Manufacturing Technologies IV

Edited by:

Prasad Yarlagadda and Yun-Hae Kim

Pages:

141-144

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1061-1062.141

Citation:

B. Wang et al., "The Effect of pH on the Fluorescence Properties of Thermally Stable CMC/Eu Complexes", Advanced Materials Research, Vols. 1061-1062, pp. 141-144, 2015

Online since:

December 2014

Authors:

Ben Wang, Jun Ye, Jian Xiong *

Keywords:

CMC/Eu Complexes, Fluorescence Properties, Thermal Analysis

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$41.00

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Paper TitlePages

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Authors: Li Jie Huang, Ting Xu, Hong Tao Wang, Shuang Fei Wang

Abstract: Carboxymethyl cellulose (CMC) made from bagasse pulp was treated by low-temperature plasma, then reacted grafting polymerization with acrylic acid (AA) to produce super absorbent polymer. The effects of discharge power, plasma treatment time, initiator dosage, acrylic acid dosage, vacuum degree and neutralization ratio on water absorbency and grafting reaction time of the products were studied by single factor experiments. The best process parameters: discharge power = 250 W; plasma treatment time = 90s; m_(K2S2O8): m _(CMC) (W/W) = 7:20; m_(AA) : m _(CMC)(W/W) = (1:9) ~ (1:8); vacuum degree = 300 Pa; neutralization degree = 40%, in which the distilled water absorbency of the product reached its maximum of 509 g/g and the grafting reaction time approached its minimum of 2min. This process has the advantages of simple operation, easy control, high grafting efficiency, short production cycle, low cost and so on, which meet the industrial production requirements of super absorbent polymer.

2578

Synthesis of Chelating Surfactant and its Application in Silk Degumming

Authors: Yun Zhang, Xi Tao Sun, Xiang Rong Wang

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245

Preparation and Characterization of Gelatin/CMC Microcapsule by Complex Coacervation

Authors: Yan Gao, Ding Xie, Dan Ni Han, Jian Xun Ouyan, Yong Le Liu

Abstract: Capsaicin microencapsules were prepared by complex coacervation with gelatin and carboxymethyl cellulose (CMC). The process conditions were optimized by Orthogonal design on the base of single factor test. As wall material concentration (WMC), gelatin/CMC rate(GCR), core/wall rate(CWR) and pH, are 1%, 9:1, 1:1 and 4.5-4.6 respectively, the encapsulation yield is 92.53% and efficiency is 91.23%. The analysis of capsaicin microcapsule showed that water content is 3.12％ and the repose angle is 43.8°. The microcapsule particle and microstructure were valued by scanning electron microscope (SEM). FT-IR spectrum proved that the coacervate is formed successfully.

1005

Study on Preparation for Super Absorbent Polymer Using Cotton Waste

Authors: Lei Tan, Zheng Qin Liu, Yang Yang Liu

Abstract: For the purpose of recycling of cotton waste cuttings and exploring the prospect of preparation for super absorbent polymer (SAP), the high viscosity carboxymethyl cellulose (CMC) was made from cotton waste first and then the SAP was synthesized by grafting acrylic acid (AA) onto the CMC with the potassium persulfate being as initiator, N, N'-methylene bis acrylamide as crosslinker. The impact of polymerization temperature, time, initiator dosage, AA concentration, crosslinker dosage, and neutralization degree on water absorbency of SAP was studied. The optimum conditions are mass ratio of AA and CMC 7.11 g/g, initiator dosage 0.03 g/g CMC, crosslinker dosage 0.2 g/100g AA, neutralization degree 80% and polymerization time 1.5 h at 70°C of the polymerization temperature. The water retention of the polymer is good and the water absorbency reaches up to 702.5 g/g.

704

Effect of Sodium Ion on Flame Retardance and Thermal Degradation of Cellulose Fiber

Authors: Dong Mei Xu, Quan Ji, Feng Yu Quan, Xiao Mei Ma, Yan Zhi Xia

Abstract: Flame retardance and thermal degradation of CMC-Na fibers were investigated using limiting oxygen index (LOI), thermal gravimetry (TG), differential TG (DTG) and Scanning electron microscopy (SEM). The LOI values of different CMC-Na fibers are 23, 26, 28.5, 31 and 34, compared with about 20 for viscose fiber. TG and DTG studies indicate that the temperature of maximum degradation rate and the maximum degradation rate for CMC-Na fibers are much lower than those of viscose fiber. However, CMC-Na fibers generate much more residues or carbonaceous char than does viscose fiber. The increase of sodium ion content, the carbon residual also increases. SEM studies of combustion residues after LOI testing indicate that all CMC-Na fibers produce intumescent, hard and brittle residue crusts.

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