Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (09): 8-14.doi: 10.13475/j.fzxb.20180807607

• Fiber Materials • Previous Articles     Next Articles

Influence of relative molecular weight of copolyamide 6/66 on crystallization and rheological properties thereof

PAN Weinan1,2, XIANG Hengxue1,2, ZHAI Gongxun1,2, NI Mingda1, SHEN Jiaguang3, ZHU Meifang1,2()   

  1. 1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
    2. College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
    3. Jiangsu Haiyang Chemical Fiber Co., Ltd., Taizhou, Jiangsu 225300, China
  • Received:2018-08-31 Revised:2018-11-28 Online:2019-09-15 Published:2019-09-23
  • Contact: ZHU Meifang E-mail:zhumf@dhu.edu.cn

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Abstract:

In order to explore the melt processing properties of new copolyamide 6/66 (PA6/66), the influence of the relative molecular weight on the melt behavior, crystallization behavior and melt rheological behavior of PA6/66 were characterized by differential scanning calorimetry, melt flow rate instrument and capillary rheometer. The results show that PA6/66 exhibits a single melting peak, and its melting point and glass transition temperature are less affected by relative molecular weight, which are about 210 ℃ and 45 ℃, respectively. Compared with PA6, the melting temperature, melting enthalpy and crystallization enthalpy of PA6/66 decreases. With the increase of relative molecular weight, the crystallization enthalpy of PA6/66 decreases from 45.16 J/g to 43.67 J/g at the cooling rate of 20 ℃/min, which is significantly lower than the crystallization enthalpy of PA6(64.49 J/g) at the same molecular weight. The copolymers are all pseudoplastic fluids in non-Newtonian fluids, with the increase of temperature, the non-Newtonian index increases and the sensitivity to shear rate decreased. In addition, PA6/66 has a higher viscous activation energy than PA6 at high shear rates.

Key words: polyamide 6, copolyamide 6/66, crystallization behavior, rheological property, relative molecular weight

CLC Number: 

  • TQ342

Fig.1

Melting curves of PA6/66 and PA6 resins"

Tab.1

Thermal performance data of PA6/66 and PA6 resins"

样品编号 Tg/℃ Tcc/℃ Tm/℃ ΔHm/(J·g-1) Xc/%
P-1 44.45 69.71 211.38 53.20 23.1
P-2 44.70 69.89 211.22 50.77 22.1
P-3 44.72 69.91 211.60 48.43 21.1
P-4 45.14 70.07 208.42 43.42 18.9
PA6 45.21 67.85 223.77 55.04 23.9

Fig.2

Melt flow rate vs. temperature of PA6/66 and PA6 resins"

Fig.3

DSC curves of PA6/66 and PA6 resins at different cooling rates & melt curves of P-4. (a)P-1;(b)P-2;(c)P-3;(d)P-4;(e)PA6;(f)Melt curves of P-4"

Tab.2

Thermal performance parameters of PA6/66 and PA6 resins at different cooling rates"

样品编号 降温速率/
(℃·min-1)		 Tc/℃ ΔHc/
(J·g-1)		 t1/2/s
2.5 166.76 51.62 363.8
P-1 5.0 159.31 49.09 205.2
10.0 151.66 46.79 124.4
20.0 140.71 45.16 77.8
2.5 165.13 51.34 408.3
P-2 5.0 158.29 48.90 224.6
10.0 150.55 45.63 134.4
20.0 139.47 44.96 78.4
2.5 163.49 46.35 424.6
P-3 5.0 157.36 44.70 225.2
10.0 149.63 43.60 133.4
20.0 139.36 42.43 81.5
2.5 163.88 50.43 423.7
P-4 5.0 158.17 47.79 221.5
10.0 151.84 45.67 126.7
20.0 146.78 43.67 88.4
2.5 178.31 74.88 420.0
PA6 5.0 171.35 73.58 234.7
10.0 163.19 67.04 142.1
20.0 152.96 64.49 91.3

Fig.4

Shear stress vs. shearing rate of PA6/66 and PA6 resins at different temperatures"

Fig.5

Apparent viscosity vs. 1/T of PA6/66 and PA6 resins at different shearing rate"

Fig.6

Non-Newtonian indexes of PA6/66 and PA6 resins at different temperatures"

Fig.7

Activation energy of PA6/66 and PA6 resins at different shearing rates"

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