Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (02): 156-161.doi: 10.13475/j.fzxb.20210602406

• Dyeing and Finshing & Chemicals • Previous Articles     Next Articles

Establishment of mathematical model and quantitative analysis for grafting rate of methylacrylamide grafted silk

FANG Shuaijun1,2, ZHENG Peixiao3, CHENG Shuangjuan1, LI Huanhuan1, QIAN Hongfei1,2()   

  1. 1. Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province, Shaoxing University, Shaoxing, Zhejiang312000, China
    2. Engineering Research Center for Eco-dyeing and Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    3. Engineering Research Center for Knitting Technology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu 214122, China
  • Received:2021-06-07 Revised:2021-11-30 Online:2022-02-15 Published:2022-03-15
  • Contact: QIAN Hongfei E-mail:qhf@usx.edu.cn

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Abstract:

In order to establish a quantitative analysis method for grafting rate of silk, a series of grafted silk fiber (PMSF) samples with different grafting rates were obtained by the grafting mulberry silk with methylacrylamide (MAA) monomers. The PMSF samples were characterized and analyzed by thermogravimetric analysis and infrared spectroscopy. It was found that a new characteristic peak appeared in the characterization curve after grafting treatment, and the area of the new characteristic peak gradually increased with the increase of grafting rate. The Gaussian method of Origin9.1 mathematical analysis software was used for peak division and fitting of derivative thermogravimetric analysis curve and infrared radiation absorption spectrum curve respectively. A linear function model between grafting rate (weighing method) and the area ratio of corresponding new characteristic peaks was established, and the samples with known grafting rates provided by an industrial partner were verified. The results showed the relative error of grafting rate of silk was less than 5%, indicating that the establishment of the mathematical linear function model combined with thermogravimetric or infrared spectroscopy detection is an effective quantitative analysis method for the determination of the grafting rate of PMSF.

Key words: grafted silk, grafting rate, methylacrylamide, thermogravimetric analysis, infrared spectrum, quantitative analysis

CLC Number: 

  • TS141.8

Fig.1

DTG curves of PMSF with different grafting rates"

Fig.2

Gaussian peak diagram of DTG curve of 41.60% grafted silk"

Tab.1

Gaussian peak parameters of DTG curve of 41.60% grafted silk"

峰数 峰位置/℃ 峰面积 半峰宽/℃ 峰高
1 67.98 6 529.3 49.15 106.00
2 285.26 4 767.6 28.41 133.90
3 324.10 11 581 20.92 441.77
4 360.50 32 984 111.24 236.58
5 529.89 35 898 119.86 238.96
6 619.93 3 508.6 44.82 62.46
7 650.16 1 388.4 18.97 58.39

Fig.3

Linear fitting relationship between grafting rates of silk and ratios of characteristic weightlessness peak area"

Fig.4

Infrared absorption spectrum curves of PMSF with different grafting rates at 1 310-1 120 cm-1"

Fig.5

Infrared absorption spectrum curve of 41.60% grafted silk"

Fig.6

Gaussian peak diagram of infrared absorption spectrum curve of 41.60% grafted silk"

Tab.2

Gaussian peak parameters of infrared absorption spectrum curve of 41.60% grafted silk"

峰数 峰位置/cm-1 峰面积 半峰宽/cm-1 峰高
A 1 164 3.32 33.25 0.09
B 1 205 4.46 24.71 0.17
C 1 232 4.38 25.24 0.16
D 1 259 4.10 30.73 0.13

Fig.7

Linear fitting relationship between the grafting rates of silk and ratios of characteristic absorption peak area"

Tab.3

Verification results of known grafting rate PMSF in infrared spectrum quantitative analysis"

样
品		 已知接枝
率F/%		 峰面积比值/% m —/% 接枝率
M ¯/%		 误差
E/%
m1 m2 m3 m4
1 32.48 31.10 34.29 31.05 30.20 31.66 32.11 1.13
2 97.66 96.50 96.92 97.47 98.57 97.37 97.04 0.63

Tab.4

Verification results of known grafting rate PMSF in thermogravimetric quantitative analysis"

样
品		 已知接枝
率F/%		 峰面积比值/% n —/% 接枝率
N ¯/%		 误差
E/%
n1 n2 n3 n4
3 34.98 83.87 83.36 84.09 82.32 83.41 33.81 3.34
4 66.53 125.98 126.47 124.99 123.93 125.41 64.67 2.79
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