Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (11): 1-8.doi: 10.13475/j.fzxb.20181004508

• Fiber Materials •     Next Articles

Preparation and properties of polyamide 66/amino-functionalized multi-walled carbon nanotubes fibers

ZHANG Jiao1,2, GAO Xuefeng1,2, WANG Yuzhou1,2, LIU Haihui1,2,3, ZHANG Xingxiang1,2,3()   

  1. 1. School of Material Science and Engineering, Tiangong University, Tianjin 300387, China
    2. Tianjin Municipal Key Laboratory of Advanced Fiber and Energy Storage, Tiangong University, Tianjin 300387, China
    3. Key Laboratory of Advanced Textile Composites of Ministry of Education, Tiangong University, Tianjin 300387, China
  • Received:2018-10-25 Revised:2019-08-24 Online:2019-11-15 Published:2019-11-26
  • Contact: ZHANG Xingxiang E-mail:zhangpolyu@aliyun.com

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Abstract:

In order to improve the mechanical properties of polyamide 66 (PA66) fiber, carboxylated multi-walled carbon nanotubes (CMWNTs) were condensed with ethylenediamine (EA) to obtain amino-functionalized multi-walled carbon nanotubes (AMWNTs), and AMWNTs doped PA66 composites (PACNTs) were prepared by in-situ polymerizing AMWNTs with polyamide 66 salt. Furthermore, the composites were melt-spun into fibers. The fibers were characterized using thermogravimetry, differential scanning calorimeter, X-ray diffraction and single fiber strength tester. The results show that, the melting temperature of the PACNTs fiber moves toward the low temperature direction as the content of AMWNTs increases, the addition of AMWNTs lowers the molecular weight of PA66, and the crystallization temperature of the PACNTs fiber moves toward the high temperature direction as a result of AMWNTs acting as a heterogeneous nucleation agent. The tensile strength and elastic modulus of the PACNTs fiber increase with increasing the content of AMWNTs. The tensile strength and elastic modulus of PACNTs fiber reach the maximum when the mass fraction of AMWNTs is 0.5%, which increase by approximately 157% and 455% as compared with those of PA66, respectively.

Key words: multi-walled carbon nanotube, polyamide 66, in-situ polymerization, fiber, mechanical property

CLC Number: 

  • TQ342.12

Fig.1

FT-IR spectra of CMWNTs and AMWNTs"

Fig.2

Raman spectra of CMWNTs and AMWNTs"

Fig.3

Full-scale XPS spectra of CMWNTs and AMWNTs"

Fig.4

C1s spectra of CMWNTs (a) and AMWNTs (b)"

Tab.1

Solubility parameters of various solvents of AMWNTsMPa1/2"

溶剂 δd δp δh δ
DMF 17.4 13.7 11.3 26.6
DMSO 18.4 16.4 10.2 26.7
DMAc 16.8 11.5 10.2 22.8
THF 16.8 5.7 8.0 19.4
Ethanol 15.8 8.8 19.4 26.5
NMP 16.8 12.3 7.2 22.9
FA 14.3 11.9 16.6 24.9
EAC 15.8 5.3 7.2 17.9
DMK 15.5 10.4 7.0 19.9

Fig.5

TGA curves of PA66 and PACNTs fiber with different mass fraction of AMWNTs"

Fig.6

DSC heating curves (a) and cooling curves (b) of PACNTs fiber with different mass fraction of AMWNTs"

Fig.7

TGA curves of PAA with different mass fraction of AMWNTs"

Tab.2

Molecular weights of PA66 and FRPA66 with different mass fraction of AMWNTs"

AMWNTs质量分数/% 相对黏度 Mη/(g·mol-1)
PA66 2.78 1.84×104
0.1 2.56 1.54×104
0.3 2.52 1.48×104
0.5 2.42 1.34×104
1.0 2.24 1.08×104

Tab.3

Crystallization parameters of PA66 and PACNTs fiber"

AMWNTs质量
分数/%		 Tm/℃ Tc/℃ ΔHc/(J·g-1) Xc/%
PA66 269.2 220.6 59.70 31.76
0.1 260.4 229.8 76.64 40.77
0.3 261.1 230.3 76.94 40.93
0.5 259.6 230.0 86.85 46.20
1.0 257.0 227.6 61.48 32.70

Fig.8

XRD patterns of PA66 and PACNTs fiber with different mass fraction of AMWNTs"

Fig.9

Tensile strength and elastic modulus of PACNTs fiber with different mass fraction of AMWNTs"

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