纺织学报 ›› 2019, Vol. 40 ›› Issue (09): 8-14.doi: 10.13475/j.fzxb.20180807607

• 纤维材料 • 上一篇    下一篇

共聚酰胺6/66相对分子质量对其结晶和流变性能的影响

潘伟楠1,2, 相恒学1,2, 翟功勋1,2, 倪明达1, 沈家广3, 朱美芳1,2()   

  1. 1.东华大学 纤维材料改性国家重点实验室, 上海 201620
    2.东华大学 材料科学与工程学院, 上海 201620
    3.江苏海阳化纤有限公司, 江苏 泰州 225300
  • 收稿日期:2018-08-31 修回日期:2018-11-28 出版日期:2019-09-15 发布日期:2019-09-23
  • 通讯作者: 朱美芳
  • 作者简介:潘伟楠(1995—),男,硕士生。主要研究方向为聚酰胺纤维。
  • 基金资助:
    国家重点研发计划项目(2017YFB0309003);国家自然科学基金项目(51603033);国家自然科学基金项目(51603035);中央高校基本科研业务费专项资金项目(2232018A3-01);中央高校基本科研业务费专项资金项目(2232018D3-03);教育部“创新团队发展计划”滚动支持项目(IRT16R13)

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

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摘要：

为探索共聚酰胺6/66(PA6/66)的熔体加工性能,研究PA6/66相对分子质量对其熔融行为、结晶行为和熔体流变行为的影响,借助差示扫描量热仪、熔体流动速率仪、毛细管流变仪等对系列不同相对分子质量PA6/66和PA6树脂的结晶行为和流变性能等进行表征。结果表明:PA6/66呈现单一的熔融峰,其熔点和玻璃化转变温度受相对分子质量影响较小,分别约为210 ℃和45 ℃;与PA6相比,PA6/66的熔点、熔融焓值和结晶焓值显著降低;随相对分子质量的增加,降温速率为20 ℃/min时,PA6/66的结晶焓值由45.16 J/g下降为43.67 J/g,明显低于同等相对分子质量下PA6的结晶焓值;不同相对分子质量的PA6/66共聚物均为假塑性流体,随着温度的升高,其非牛顿指数增大,对剪切速率的敏感程度降低;在高剪切速率下,PA6/66具有比PA6更高的黏流活化能。

关键词: 聚酰胺6, 共聚酰胺6/66, 结晶行为, 流变性能, 相对分子质量

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

中图分类号: 

  • TQ342

图1

PA6/66和PA6的DSC升温熔融曲线"

表1

PA6/66和PA6树脂的热性能数据"

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

图2

PA6/66和PA6树脂熔体流动速率随温度的变化"

图3

PA6/66和PA6树脂在不同降温速率下的DSC曲线以及P-4的熔融曲线"

表2

PA6/66和PA6树脂在不同降温速率热性能参数"

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

图4

PA6/66和PA6树脂在不同温度下的剪切应力-剪切速率关系"

图5

PA6/66和PA6树脂在不同剪切速率下的表观黏度与1/T关系图"

图6

PA6/66和PA6树脂在不同温度下的非牛顿指数"

图7

PA6/66和PA6树脂在不同剪切速率下的黏流活化能"

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