Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (09): 58-63.doi: 10.13475/j.fzxb.20210801506

• Fiber Materials • Previous Articles     Next Articles

Effect of coagulation bath on structure and properties of regenerated collagen fibers

DU Xuan1,2, DING Changkun1,2(), YUE Chengfei1,2, SU Jieliang1,2, YAN Xuhuan1,2, CHENG Bowen3   

  1. 1. School of Material Science and Engineering, Tiangong University, Tianjin 300387, China
    2. Tianjin Key Laboratory of Advanced Fibers and Energy Storage, Tiangong University, Tianjin 300387, China
    3. Tianjin University of Science and Technology, Tianjin 300457, China
  • Received:2021-08-02 Revised:2022-03-15 Online:2022-09-15 Published:2022-09-26
  • Contact: DING Changkun E-mail:dingchangkun@tiangong.edu.cn

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Abstract:

To understand the forming mechanism of collagen(Col) dopes in different coagulation baths, regenerated collagen fibers were prepared via dry-wet spinning method using acetone, NaCl solution, polyvinyl alcohol(PEG) solution and phosphate buffer saline(PBS) solution as coagulation baths. The effects of coagulation conditions on the fibril structure and mechanical properties of collagen fibers were systematically studied. The results showed that collagen dopes demonstrated the fastest dehydration, aggregation and solidification rates in acetone coagulation bath, and acetone-Col fibers could achieve the tensile strength of up to 1.22 cN/dtex with highly ordered and tightly packed small fibrils. In addition, for NaCl solution, PEG solution and PBS solution, collagen fibers were all precipitated by removing the hydration layers on their surfaces, and PBS solution displayed a very slow dehydration rate because its salt concentration was low. However, the tensile strength of PBS-Col fibers was relatively high as well due to homogeneous tightly arranged fibrils with larger size. Furthermore, NaCl-Col fibers and PEG-Col fibers showed relatively lower tensile strength because of larger fibrils with more loosely package and bigger gaps, leading to lowered intermolecular interactions among fibrils.

Key words: collagen fiber, coagulation bath, dry-wet spinning, fibril, tensile strength, forming mechanism

CLC Number: 

  • TQ342.94

Fig.1

Mechanical properties of acetone-Col fibers. (a) Deionized water; (b) Ammonia; (c) Coagulation time"

Fig.2

Mechanical properties of NaCl-Col fibers. (a) NaCl concentration; (b) pH value; (c) Coagulation time"

Fig.3

Mechanical properties of PEG-Col fibers. (a) Relative molecular weight of PEG; (b) pH value; (c) Coagulation time"

Fig.4

Mechanical properties of PBS-Col fibers"

Fig.5

SEM images of regenerated collagen fibers. (a) Surface; (b) Profile; (c) Cross section"

Fig.6

XRD curves of regenerated collagen fibers"

Fig.7

Infrared spectra of regenerated collagen fibers"

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