Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (03): 32-38.doi: 10.13475/j.fzxb.20180202207

• Fiber Materials • Previous Articles     Next Articles

Comparison between structure and performance of fresh cocoon raw silk and dry cocoon raw silk and identification method thereof

LI Bing1(), GE Guoping1, GUO Wei1, DONG Yongchun2, CHEN Xingcan1   

  1. 1. Inspection and Quarantine Technology Center, Guangxi Entry-Exit Inspection and Quarantine Bureau,Nanning, Guangxi 530021, China
    2. School of Textile Science and Engineering,Tianjin Polytechnic University, Tianjin 300387, China
  • Received:2018-02-06 Revised:2018-08-17 Online:2019-03-15 Published:2019-03-15

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Abstract:

In order to identify fresh cocoon raw silk and dry cocoon raw silk, the surface morphology and structure properties of the two kinds of raw silk were characterized and compared by using electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and thermal gravimetric analysis and contact angle test, respectively, and then on the basis of the difference between their surface properties, an relatively simple and accuracy identification method for the two kinds of raw silk was established. The results indicated that the two kind of raw silk have the similar chemical composition, p-sheet conformation and thermal decomposition curves. However, compared with dry cocoon raw silk, fresh cocoon raw silk has a more uneven surface and a bigger gap between single fibers. Additionally, it showed less crystallinity and better hydrophilicity than dry cocoon raw silk. The two kinds of raw silk were efficiently identified using a method based on determination of their settling times in sodium dodecyl benzene sulfonate aqueous solution. The accurate rates of this method are as high as 100% for fresh cocoon raw silk and near 80% for dry cocoon raw silk, respectively.

Key words: cocoon raw silk, fresh cocoon, dry cocoon, surface structure, hydrophilicity, identification

CLC Number: 

  • TS143.2

Fig.1

SEM images of two kinds of raw silk. (a)Dry cocoon raw silk(×1 000);(b)Fresh cocoon raw silk(×1 000);(c)Dry cocoon raw silk(×1 800);(d)Fresh cocoon raw silk(×1 800)"

Fig.2

FT-IR spectra of fresh cocoon silk and dry cocoon silk"

Fig.3

XRD spectra of fresh cocoon silk (a) and dry cocoon silk (b)"

Fig.4

Thermal analysis curves of fresh cocoon silk and dry cocoon silk. (a)TGA curves;(b)DTG curves"

Fig.5

Comparison on water contact angle of fresh cocoon raw silk b (a) and dry cocoon raw silk g (b)"

Tab.1

Comparison on water contact angle of two kinds of raw silk(°)"

样品编号 接触角 样品编号 接触角
鲜茧生丝a 38.4 干茧生丝e 50.5
鲜茧生丝b 31.9 干茧生丝f 49.8
鲜茧生丝c 32.5 干茧生丝g 53.0
鲜茧生丝d 37.9 干茧生丝h 48.7

Tab.2

Settling time of two kinds of raw silk in SDBS solutions with different concentrations"

SDBS浓度/
(mmol·L-1)		 纤维根数 沉降时间/s SDBS浓度/
(mmol·L-1)		 纤维根数 沉降时间/s
鲜茧生丝 干茧生丝 鲜茧生丝 干茧生丝
0 4 >600 >600 2.5 4 45 >600
12 >600 >600 12 49 >600
20 >600 >600 20 19 >600
28 >600 >600 28 22 285
36 >600 >600 36 49 53
0.5 4 42 >600 3.5 4 46 >600
12 46 >600 12 35 >600
20 17 >600 20 22 352
28 13 >600 28 38 114
36 36 >600 36 43 51
1.0 4 41 >600 5.0 4 62 >600
12 45 >600 12 32 78
20 18 >600 20 27 67
28 16 >600 28 47 52
36 40 >600 36 27 50

Tab.3

Settling time of 26 kinds of commercial raw silk"

鲜茧
生丝编号		 时间/
s		 判定 准确
性		 干茧
生丝编号		 时间/
s		 判定 准确
性
1 21 鲜茧 是 1 >600 干茧 是
2 46 鲜茧 是 2 >600 干茧 是
3 122 鲜茧 是 3 >600 干茧 是
4 68 鲜茧 是 4 215 鲜茧 否
5 146 鲜茧 是 5 >600 干茧 是
6 69 鲜茧 是 6 >600 干茧 是
7 43 鲜茧 是 7 >600 干茧 是
8 19 鲜茧 是 8 >600 干茧 是
9 46 鲜茧 是 9 187 鲜茧 否
10 72 鲜茧 是 10 >600 干茧 是
11 115 鲜茧 是 11 >600 干茧 是
12 132 鲜茧 是 12 226 鲜茧 否
13 154 鲜茧 是 13 >600 干茧 是
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