Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (10): 7-13.doi: 10.13475/j.fzxb.20200202707

• Fiber Materials • Previous Articles     Next Articles

Hydrogen bonding mechanism and properties of polyvinyl alcohol/krill protein fibers

GUAN Fucheng, GUO Jing, LÜ Lihua(), TAN Qian, SONG Jingxing, ZHANG Xin   

  1. College of Textile and Material Engineering, Dalian Polytechnic University, Dalian, Liaoning 116034, China
  • Received:2020-02-13 Revised:2020-07-17 Online:2020-10-15 Published:2020-10-27
  • Contact: Lü Lihua E-mail:lvlh@dlpu.edu.cn

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Abstract:

To solve the difficult thermoplastic processing and single function of polyvinyl alcohol(PVA), krill protein(AKP) and water were used as plasticizers to prepare PVA/AKP fibers by melt spinning. The hydrogen bonding in PVA/AKP fiber was characterized by infrared spectrometer, and the mechanism of hydrogen bonding was analyzed. Additionally, the crystallinity, morphology, thermal properties and mechanical properties of PVA/AKP fibers were characterized by X-ray diffractometer, scanning electron microscope, differential scanning calorimeter and single fiber strength tester, respectively. The results show that with the increase of AKP mass fraction, the content of intramolecular hydrogen bond and crystallinity of PVA/AKP fibers firstly increases and then decreases. When the mass fraction of AKP is 2%, the content of intramolecular hydrogen bond in PVA/AKP fibers reaches the maximum value (85.37%), and the crystallinity also reaches the maximum value (48%), and the fiber breakage strength reaches a maximum of 2.15 cN/dtex. AKP is helpful to improve the surface smoothness of the fiber, the fiber cross section presents regular round. Additionally, PVA/AKP fibers are more responsive to alkaline solutions, and the water absorption rate of the fiber is a constant of 36% after 2 h.

Key words: polyvinyl alcohol/krill protein fiber, melt spinning, hydrogen bond action mechanism, crystallinity

CLC Number: 

  • TS151

Fig.1

Schematic diagram for PVA, and PVA/AKP Spinning process"

Fig.2

Infrared spectra of AKP,PVA,PVA/AKP(a)and PVA/AKP with different mass fraction of AKP(b)"

Fig.3

Hydrogen bond mechanism of PVA/AKP fibers"

Fig.4

Infrared spectra of PVA/AKP fibers with different AKP contents by Gaussian fitting"

Tab.1

Fitting results of various kinds of hydrogen bond"

AKP质
量分数/%		 氢键
类型		 氢键表
达式		 波数/
cm-1		 平均峰
面积		 相对强
度/%
自由羟基 —OH 3 575 2.17 8.32
1 分子内氢键 OH…OH 3 428 28.65 75.30
分子间氢键 OH…N 3 126 6.23 16.38
自由羟基 —OH 3 575 0.55 1.23
2 分子内氢键 OH…OH 3 428 37.61 85.37
分子间氢键 OH…N 3 126 5.90 12.39
自由羟基 —OH 3 575 10.96 26.92
3 分子内氢键 OH…OH 3 428 24.76 60.82
分子间氢键 OH…N 3 126 4.99 12.25
自由羟基 —OH 3 575 10.58 30.93
4 分子内氢键 OH…OH 3 428 26.14 58.80
分子间氢键 OH…N 3 126 5.53 10.27

Fig.5

XRD curves of AKP, PVA and PVA/AKP(a)and PVA/AKP with different mass fraction of AKP(b)"

Fig.6

Breaking strength of PVA/AKP fibers with different mass fraction of AKP"

Fig.7

DSC curves of PVA/AKP fibers with different mass fraction of AKP"

Fig.8

Surface SEM images of PVA/AKP fibers with different mass fraction of AKP(×1 000)"

Fig.9

Surface forming mechanism of PVA/AKP fibers"

Fig.10

Cross-section SEM images of PVA/AKP fibers with different mass fraction of AKP(×200)"

Fig.11

Swelling of PVA/AKP fibers at different pH value"

Fig.12

Water absorption of PVA/AKP fibers with different time"

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