Effect of Alkyl Side Chain Length on Relaxation Behaviors in Poly(n-alkyl Acrylates) and Poly(n-alkyl Methacrylates)
作者： Xiaojun He , Jinrong Wu , Guangsu Huang , Xiaoan Wang
DOI: 10.1080/00222341003648870
关键词:
摘要: Dynamic mechanical analysis (DMA) is used to investigate the effect of alkyl side chain length on relaxation behavior poly(n-alkyl acrylates) (PnAA) and methacrylates) (PnAMA) above glass transition temperature (Tg). Master curves shift factors (log aT) were obtained using time–temperature superposition (TTS) principle. The log aT PnAA PnAMA exhibit a dynamic crossover from one Vogel–Fulcher–Tammann–Hesse (VFTH) equation another Tg. corresponding was designated as (Tc). It found that Tc/Tg apparent activation energy (Eg) increases, e whereas fragility index (m) decreases with increasing length. Further shows m ∝ Tg, Eg∝ , m2 for both PnAMA.
harvard.edu
sci-hub.se 参考文章(47)
Fred W. Billmeyer, Textbook of polymer science ,(1971)
G. Tammann, W. Hesse, Die Abhängigkeit der Viscosität von der Temperatur bie unterkühlten Flüssigkeiten Zeitschrift für anorganische und allgemeine Chemie. ,vol. 156, pp. 245- 257 ,(1926) , 10.1002/ZAAC.19261560121
Jinrong Wu, Guangsu Huang, Liangliang Qu, Jing Zheng, Correlations between dynamic fragility and dynamic mechanical properties of several amorphous polymers Journal of Non-crystalline Solids. ,vol. 355, pp. 1755- 1759 ,(2009) , 10.1016/J.JNONCRYSOL.2009.06.013
W. Wulf, Through the Glass Lightly Science. ,vol. 267, pp. 1617- 1617 ,(1995) , 10.1126/SCIENCE.267.5204.1617-C
Jing Yong Ye, Toshiaki Hattori, Hiroki Nakatsuka, Yoshihiro Maruyama, Mitsuru Ishikawa, Microscopic dynamics of the glass transition investigated by time-resolved fluorescence measurements of doped chromophores Physical Review B. ,vol. 56, pp. 5286- 5296 ,(1997) , 10.1103/PHYSREVB.56.5286
A. V. Tobolsky, J. J. Aklonis, G. Akovali, Viscoelastic Properties of Monodisperse Polystyrene The Journal of Chemical Physics. ,vol. 42, pp. 723- 728 ,(1965) , 10.1063/1.1695997
S. Pawlus, K. Kunal, L. Hong, A.P. Sokolov, Influence of molecular weight on dynamic crossover temperature in linear polymers Polymer. ,vol. 49, pp. 2918- 2923 ,(2008) , 10.1016/J.POLYMER.2008.04.040
L. Andreozzi, M. Faetti, M. Giordano, F. Zulli, V. Castelvetro, Crossover region and entanglement in nearly monodisperse poly(ethyl acrylates) studied with electron spin resonance spectroscopy Philosophical Magazine. ,vol. 84, pp. 1555- 1565 ,(2004) , 10.1080/14786430310001644332
Michael Wind, Robert Graf, Andreas Heuer, Hans Wolfgang Spiess, Structural relaxation of polymers at the glass transition: conformational memory in poly(n-alkylmethacrylates). Physical Review Letters. ,vol. 91, pp. 155702- ,(2003) , 10.1103/PHYSREVLETT.91.155702
C. Lorthioir, A. Alegría, J. Colmenero, Self-confined polymer dynamics in miscible binary blends European Physical Journal E. ,vol. 12, pp. 127- 130 ,(2003) , 10.1140/EPJED/E2003-01-029-9