Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (07): 47-52.doi: 10.13475/j.fzxb.20191005706

• Textile Engineering • Previous Articles     Next Articles

Thermal aging and life prediction of silk fabrics

GUO Lang1,2, WANG Liqin1,2(), ZHAO Xing1,2   

  1. 1. School of Cultural Heritage, Northwest University, Xi'an, Shaanxi 710069, China
    2. Key Laboratory of Cultural Heritage Research and Protection Technology, Ministry of Education, Northwest University, Xi'an, Shaanxi 710069, China
  • Received:2019-10-28 Revised:2020-04-13 Online:2020-07-15 Published:2020-07-23
  • Contact: WANG Liqin E-mail:wangliqin@nwu.edu.cn

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Abstract:

In order to investigate the influence of wet and thermal environments on the preservation of silk cultural relics, silk (Bombyx mori) samples were aged by dry heat and damp heat at 110 ℃ and 130 ℃, respectively. Material testing machine, colorimeter, scanning electron microscope and Fourier transform infrared spectrometer were used to measure and analyze the tensile strength, color, micro-morphology and structure of simulated silk samples before and after aging. The life prediction equation of silk fabrics was proposed. The results show that the tensile strength of the samples decrease linearly with the aging time, while the color turned yellow. After dry heat and damp heat aging, the fiber surfaces show different degrees of damage, and in the latter condition pores formed by fiber bundle interlacing are more significantly corroded than other parts. The content of β-sheet in the secondary structure is significantly reduced, consistent with the trend of strength change. The work reveals that the low temperature and dry condition are suitable for the preservation of silk cultural relics.

Key words: silk fabric, dry heat aging, damp heat aging, life prediction, preservation of cultural relics

CLC Number: 

  • TS146

Fig.1

Tensile strength retention rate of silk samples at different aging time"

Fig.2

Chromaticity changes of silk samples at 110 ℃ dry heat aging conditions"

Fig.3

SEM images of silk samples before and after aging. (a) Original samples;(b) Dry heat aging at 110 ℃ for 48 d;(c) Damp heat aging at 110 ℃ for 48 d;(d) Dry heat aging at 130 ℃ for 18 d;(e) Damp heat aging at 130 ℃ for 18 d"

Fig.4

Gaussian fitting results of original samples of 1 350-1 205 cm-1 at amide III band"

Tab.1

Correspondence between four sub-peaks and secondary structures"

子峰 波数范围/cm-1 二级结构
a 1 350~1 327 α-螺旋
b 1 327~1 282 α-螺旋
c 1 282~1 245 无规卷曲
d 1 245~1 205 β-折叠

Fig.5

Variation of relative contents of secondary structures of samples under different aging conditions. (a) Dry heat aging at 110 ℃; (b) Damp heat aging at 110 ℃;(c) Dry heat aging at 130 ℃;(d) Damp heat aging at 130 ℃"

Tab.2

Life of silk fabrics under different aging conditions"

实验组 老化条件 寿命/d
1 110 ℃干热老化 58.61
2 110 ℃湿热老化 27.86
3 130 ℃干热老化 7.61
4 130 ℃湿热老化 5.56

Fig.6

Curves of silk fabrics life with different temperatures"

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