Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (07): 36-40.doi: 10.13475/j.fzxb.20210600705

• Fiber Materials • Previous Articles     Next Articles

Determination of molecular weight and Mark-Houwink parameters of bio-based polyamide 56

WANG Lijuan1, GONG Yumei1(), LI Xiaoyan1, WANG Ying1, HAO Xinmin2, FAN Lijun3   

  1. 1. School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, Liaoning 116034, China
    2. Institute of Quartermaster Engineering & Technology, Systems Engineering Institute, Academy of Military Sciences, Beijing 100010, China
    3. Eco-Nylon (Dandong) Co., Ltd., Dandong, Liaoning 118303, China
  • Received:2021-06-01 Revised:2022-01-16 Online:2022-07-15 Published:2022-07-29
  • Contact: GONG Yumei E-mail:ymgong@dlpu.edu.cn

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Abstract:

In order to quickly evaluate the molecular weight of the bio-based polyamide 56 (PA56), the molecular weight parameters K and α of Mark-Houwink equation for bio-based PA56 were calculated by measuring the molecular weight and fluidity of the solution. Bio-based PA56 was dissolved in 90% formic acid (FA) and hexafluoroisopropanol (HFIP) respectively, and the intrinsic viscosity of the dilute solution was determined at 25 ℃. It was found reasonable to use the limit of specific concentration viscosity as intrinsic viscosity value in solvent FA which formed strong hydrogen bond with PA56, but in solvent HFIP that was unable to form strong hydrogen bond with bio-based PA56, the specific concentration and logarithmic viscosity limits intersect at a point where intrinsic viscosity was determined. The molecular weight parameters of bio-based PA56 in FA were found to be α=0.77 and K=7.088×10-3 cm3/g, and the molecular weight parameters in HFIP were α=0.90 and K=2.140×10-3 cm3/g.

Key words: bio-based polyamide 56, Mark-Houwink parameters, hexafluoroisopropanol, formic acid, intrinsic viscosity

CLC Number: 

  • O645

Tab.1

Flowing time of solution with different concentrations in Ubbelohde viscometer."

溶液质量浓度 FA(HFIP) c0/4 c0/3 c0/2 2c0/3 c0
流出时间 t0 t1 t2 t3 t4 t5

Tab.2

End-group titration of bio-based PA56 samples"

样品 端氨基的量/(mmol·kg-1) 端羧基的量/(mmol·kg-1)
S1 40.2 113.2
S2 21.2 112.5
S3 48.9 68.1
S4 44.3 97.2

Tab.3

Flowing time of S1, S2 and S3 solutions in FA with different concentrations in Ubbelohde viscometerss"

样品编号 FA c0/4 c0/3 c0/2 2c0/3 c0
S1 45.16 57.07 61.62 70.41 79.34 97.27
S2 45.16 58.45 63.57 73.12 82.92 103.21
S3 45.16 60.06 65.30 76.45 87.63 110.45

Fig.1

Flowing curves of S1, S2 and S3 solutions in FA"

Tab.4

Intrinsic viscosity values of S1, S2 and S3 solutions in FAdL/g"

样品编号 [ηsp] [ηr] [η]
S1 1.046 1.003 1.024
S2 1.162 1.105 1.133
S3 1.288 1.218 1.253

Tab.5

Flowing time of S3 and S4 solutions in HFIP with different concentrations in Ubbelohde viscometerss"

样品编号 HFIP c0/4 c0/3 c0/2 2c0/3 c0
S3 121.76 170.38 185.55 222.92 264.18 366.39
S4 121.76 161.50 173.68 207.61 240.81 315.98

Fig.2

Flowing curves of S3 and S4 solutions in HFIP"

Tab.6

Mark-Houwink parameters of bio-based PA56 in FA and HFIP dilute solution"

样品编号 FA稀溶液 HFIP稀溶液
[ηsp] [ηr] [η] [η]
α K×103/(cm3·g-1) α K×103/(cm3·g-1) α K×103/(cm3·g-1) α K×103/(cm3·g-1)
S1-S2 0.77 7.087 0.71 12.000 0.74 9.225 — —
S1-S3 0.77 7.091 0.72 9.901 0.74 8.899 — —
S2-S3 0.77 7.087 0.73 10.920 0.75 8.379 — —
S3-S4 — — — — — — 0.90 2.140
平均值 0.77 7.088 0.72 10.940 0.74 8.834 0.90 2.140
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