Citation: Xin-xin Sang, Jing-nan Zhang, Yu-cai Ke, Xin-yu Cao, Yong-mei Ma, Fosong Wang. The Influence of Rare Earth Ions on the Rheological Behavior of Polyamide[J]. Chinese Journal of Polymer Science, ;2015, 33(10): 1453-1461. doi: 10.1007/s10118-015-1699-7 shu

The Influence of Rare Earth Ions on the Rheological Behavior of Polyamide

Xin-xin Sang ^1,2,3 ,
Jing-nan Zhang ⁴ ,
Yu-cai Ke ⁴ ,
Xin-yu Cao ⁴ ,
Yong-mei Ma ^4,, ,
Fosong Wang ⁴

1.
1. Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
2.
2. University of Chinese Academy of Sciences, Beijing 100049, China
3.
4.
Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Corresponding author: Yong-mei Ma,
Received Date: 23 March 2015
Revised Date: 2 June 2015

Fund Project: This work was financially supported by the National Science-Technology Support Plan Projects (No. 2014BAC03B05), the National Natural Science Foundation of China (No. 51373184) and MoST973 Research Program (Nos. 2012CB933801 and 2014CB931803).

The polyamide 66 (PA66)/lanthanum acetate blends with small amounts of salt loadings ( 1 wt% of PA) have been prepared in a twin-screw extruder. The rheology of PA66 and its blends has been investigated by a rotational rheometer. The results suggested that with the salt loading in excess of 0.2 wt% the typical Newtonian viscosity plateau disappeared and both the low-frequency complex viscosities * and storage modulus G' of blends were much higher than those of neat PA66, the storage modulus was higher than the loss modulus at low frequencies (tan 1), i.e., the melt changed from a viscoelastic liquid for unfilled polymer to a viscoelastic solid (G' G''). While the viscosity followed a strong shear thinning with increasing frequency, the * and G' decreased significantly even lower than those of neat PA66 at high frequencies. The combination of dynamic mechanical analysis (DMA) and X-ray photoelectron spectroscopy (XPS) analysis has revealed that coordination effect occurred between lanthanum and carbonyl oxygen atoms in amide groups of the polymer to form pseudocrosslinked network structure, which makes the glass transition temperatures (Tg) and storage modulus (E') of blends enhanced. The network structure formation-destruction and chains entanglement-disentanglement processes at different frequencies are responsible for the above rheological behaviors of blends.
- Rheology,
- PA66-lanthanum acetate blends,
- Polymer-metal interaction,
- Coordination,
- Viscoelastic solid behavior
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