Strain amplitude response and the microstructure of PA/clay nanocomposites

被引:41
|
作者
Wan, T
Clifford, MJ
Gao, F
Bailey, AS
Gregory, DH
Somsunan, R
机构
[1] Univ Nottingham, Sch Mech Mat & Mfg Engn, Nottingham NG7 2RD, England
[2] Nottingham Trent Univ, Sch Biomed & Nat Sci, Nottingham NG11 8NS, England
[3] Univ Nottingham, Sch Chem, Nottingham NG7 2RD, England
关键词
polyamide; 6; nanocomposites; microstructure;
D O I
10.1016/j.polymer.2005.04.105
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Polyamide 6/clay nanocomposites (PAn, where n is the mass fraction of clay) with various clay loading were prepared by melt compounding in a twin screw extruder. Exfoliation of clay in a PA matrix was confirmed by X-ray diffraction. Strain amplitude response of PAn in both melt and solution states has been investigated. In the melt state, critical strain amplitude of PAn is sensitive to strain amplitude response and decrease logarithmically with increasing clay loading. The elastic moduli (G) of PAn are reversible under frequency loop sweeps. Comparisons of strain amplitude response in both melt and solution states have been conducted. Two different responses have been observed: strain thinning in the melt state and weak strain overshoot in the solution state. FTIR studies show that amide II band of PAn shifts toward high wavenumbers, but amide I band and N-H stretching vibration are independent of clay loading. We suggest that two types of strain amplitude response of PAn can be explained: strain thinning which is dominant in PAn caused by physical adsorption and entanglement of PA chains on nanoclays and weak strain overshoot caused by weak bonds between PA chains and nanoclays. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:6429 / 6436
页数:8
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