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

被引：0
|
作者：
Pan W. [1 ,2 ]
Xiang H. [1 ,2 ]
Zhai G. [1 ,2 ]
Ni M. [1 ]
Shen J. [3 ]
Zhu M. [1 ,2 ]
机构：
[1] State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai
[2] College of Materials Science and Engineering, Donghua University, Shanghai
[3] Jiangsu Haiyang Chemical Fiber Co., Ltd., Taizhou, 225300, Jiangsu
来源：
Fangzhi Xuebao/Journal of Textile Research | 2019年 / 40卷 / 09期
关键词：
Copolyamide; 6/66; Crystallization behavior; Polyamide; 6; Relative molecular weight; Rheological property;
D O I：
10.13475/j.fzxb.20180807607
中图分类号：
学科分类号：
摘要：
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. Copyright No content may be reproduced or abridged without authorization.
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页码：8 / 14
页数：6
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