| Original Articles |
|
|
|
|
Low-Frequency Internal Friction Study on the Structural Changes in Polymer Melts |
| WU Xue-Bang;XU Qiao-Ling;SHANG Shu-Ying;SHUI Jia-Peng;LIU Chang-Song;ZHU Zhen-Gang |
| Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, PO Box 1129, Hefei 230031 |
|
| Cite this article: |
|
WU Xue-Bang, XU Qiao-Ling, SHANG Shu-Ying et al 2008 Chin. Phys. Lett. 25 1388-1391 |
|
|
|
Abstract With the help of the low-frequency internal friction method, we investigate the structural properties of polymer melts, such as amorphous polystyrene (PS), poly(methyl methacrylate) (PMMA), and semi-crystalline poly(ethylene oxide) (PEO). An obvious peak of relaxation type is found in each of the
internal friction curves. The peak temperature Tp follows the relation Tp≈(1.15-1.18)Tg for PS and PMMA melts, while it follows T≈1.22Tm for PEO melt, with Tg being the glass transition temperature and Tm the melting temperature. Based on the analysis of the features of this peak, it is found that this peak is related to the liquid-liquid transition temperature Tll of
polymer melts. Mechanism of the liquid-liquid transition is suggested to be thermally-activated collective relaxation through cooperation. This finding may be helpful to understand the structural changes in polymer melts. In addition, the internal friction technique proves to be effective in studying dynamics in polymer melts.
|
| Keywords:
62.40.-i
61.25.Hk
74.70.Ja
|
|
|
Received: 20 December 2007
Published: 31 March 2008
|
|
|
|
|
|
|
|
[1] Munch E et al 2006 Phys. Rev. Lett. 97 207801 Kalogeras I M et al 2006 Appl. Phys. Lett. 89172905
[2] Boyer R F 1987 In Order in the Amorphous State ofPolymers ed Keinath S E, Miller R F and Rieke J K (New York:Plenum) part II
[3] Boyer R F 1966 J. Polym. Sci. C: Polym. Symp. 14 267
[4] Boyer R F 1980 J. Macromol. Sci., Phys. 18461 Boyer R F 1986 J. Appl. Polym. Sci. 32 4075
[5] Langley N R and Ferry J D 1968 Macromolecules 1 353 Sanders J F and Ferry J D 1974 Macromolecules 7681
[6] Irina P and Franjo R 2001 J. Polym. Sci. B: Polym.Phys. 39 129 Irina P and Franjo R 2001 Macromol. Chem. Phys. 202 1844
[7] Dudognon E, Bern\`{es A and Lacabanne C 2002 Macromolecules 35 5927 Dudognon E, Bern\`{es A and Lacabanne C 2002 Polymer 43 5175 Dudognon E, Bern\`{es A and Lacabanne C 2004 J.Macromol. Sci., Phys. 43 591
[8] Shang S Y, Zhu Z G, Lu Z J et al 2007 J. Phys.:Condens. Matter 19 416107 Shang S Y, Wu X B and Zhu Z G 2007 Physica B 396 160
[9] Orbon S J and Plazek D J 1985 J. Polym. Sci. B:Polym. Phys. 23 41 Chen J, Kow C, Fetters L J and Plazek D J 1985 J.Polym. Sci., Part B: Polym. Phys. 23 13
[10] Zhang J X et al 1995 Phys. Rev. B 52 268
[11] Wang Y N et al 1989 J. Phys.: Condens. Matter 1 1039
[12] Huang Y N, Wang Y N and Shen H M 1992 Phys. Rev. B 46 3290
[13] Ying X N and Wang Y N 2005 Physica B 370 146
[14] Liu W et al 2006 Acta Phys. Sin. 55 5996 (inChinese)
[15] Chen G, Zhu Z G and Shui J P 1999 Chin. Phys. Lett. 16 589 Liang Y F, Zhu Z G and Shui J P 2000 Acta Phys. Sin. 327 49 (in Chinese)
[16] Zu F Q, Zhu Z G, Guo L J et al 2001 Phys. Rev. B 64 180203 Zu F Q, Zhu Z G, Guo L J et al 2002 Phys. Rev. Lett. 89 125505 Guo L J, Wu A Q, Zhu Z G et al 2007 J. Non-Cryst.Solids 353 1631
[17] Wu X B and Zhu Z G 2007 Appl. Phys. Lett. 90251908
[18] Wang W J, Kong X Z and Zhu Z G 2007 Phys. Rev. E 75 041302
[19] Castellano C, Generosi J, Congiu A and Cantelli R 2006 Appl. Phys. Lett. 89 233905
[20] Cantelli R 2006 Mat. Sci. Eng. A 442 5
[21] Zu F Q, Guo L J, Zhu Z G and Feng Y 2002 Chin. Phys.Lett. 19 94
[22] Shang S Y, Wu X B, Shui J P and Zhu Z G 2007 Chin.J. Polym. Sci. 25 629
[23] Qiao B G, Xu G F, Yu F S et al 1986 PolymerTransitions and Relaxations (Bejing: Science Press) (in Chinese) p219
[24] Nowick A S and Berry B S 1972 Anelastic Relaxationin Crystalline Solids (New York: Academic)
[25] Zhu Y C, Zhou W, Wang J J et al 2007 J. Phys. Chem.B 111 11388
[26] Podesva J, Dybal J, Spevacek J, Stepanek P and Cernoch P2001 Macromolecules 34 9023 |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
