Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (6): 20240013.doi: 10.7503/cjcu20240013
• Polymer Chemistry • Previous Articles Next Articles
BAI Rong1,2, LI Shangwei1(), CHEN Quan1,2, SUN Zhaoyan1,2, XU Wensheng1,2(
)
Received:
2024-01-08
Online:
2024-06-10
Published:
2024-04-10
Contact:
LI Shangwei, XU Wensheng
E-mail:swli@ciac.ac.cn;wsxu@ciac.ac.cn
Supported by:
CLC Number:
TrendMD:
BAI Rong, LI Shangwei, CHEN Quan, SUN Zhaoyan, XU Wensheng. Broadband Dielectric Spectroscopy Study of Dynamics of Telechelic Polypropylene Glycol Melts[J]. Chem. J. Chinese Universities, 2024, 45(6): 20240013.
Sample | Segmental(α) relaxation | NM relaxation | ||||||
---|---|---|---|---|---|---|---|---|
lg[τ0(s)] | D | T0/K | m | lg[τ0(s)] | D | T0/K | m | |
1k⁃PPG⁃OH | -11.2 | 4.5 | 174 | 102 | -12.1 | 7.7 | 161 | 63 |
2k⁃PPG⁃OH | -12.0 | 5.0 | 174 | 103 | -11.5 | 9.4 | 155 | 58 |
4k⁃PPG⁃OH | -11.8 | 4.6 | 176 | 109 | -10.0 | 6.6 | 166 | 63 |
1k⁃PPG⁃C=C | -18.2 | 16.6 | 136 | 77 | -11.7 | 8.9 | 142 | 63 |
2k⁃PPG⁃C=C | -14.4 | 8.8 | 156 | 87 | -11.9 | 10.5 | 146 | 56 |
4k⁃PPG⁃C=C | -13.9 | 7.6 | 162 | 93 | -9.8 | 6.0 | 163 | 65 |
Table 1 Vogel-Fulcher-Tamman(VFT) parameters and fragility index m for the dielectric relaxations of PPGs
Sample | Segmental(α) relaxation | NM relaxation | ||||||
---|---|---|---|---|---|---|---|---|
lg[τ0(s)] | D | T0/K | m | lg[τ0(s)] | D | T0/K | m | |
1k⁃PPG⁃OH | -11.2 | 4.5 | 174 | 102 | -12.1 | 7.7 | 161 | 63 |
2k⁃PPG⁃OH | -12.0 | 5.0 | 174 | 103 | -11.5 | 9.4 | 155 | 58 |
4k⁃PPG⁃OH | -11.8 | 4.6 | 176 | 109 | -10.0 | 6.6 | 166 | 63 |
1k⁃PPG⁃C=C | -18.2 | 16.6 | 136 | 77 | -11.7 | 8.9 | 142 | 63 |
2k⁃PPG⁃C=C | -14.4 | 8.8 | 156 | 87 | -11.9 | 10.5 | 146 | 56 |
4k⁃PPG⁃C=C | -13.9 | 7.6 | 162 | 93 | -9.8 | 6.0 | 163 | 65 |
Sample | Mn | Tg,cal/K | Tg,diel/K |
---|---|---|---|
1k⁃PPG⁃OH | 1000 | 204.4 | 199.8 |
2k⁃PPG⁃OH | 2000 | 206.3 | 200.9 |
4k⁃PPG⁃OH | 4000 | 206.3 | 201.7 |
1k⁃PPG⁃C=C | 1080 | — | 184.3 |
2k⁃PPG⁃C=C | 2080 | 195.9 | 191.8 |
4k⁃PPG⁃C=C | 4080 | 199.8 | 195.4 |
Table 2 Basic properties of PPGs
Sample | Mn | Tg,cal/K | Tg,diel/K |
---|---|---|---|
1k⁃PPG⁃OH | 1000 | 204.4 | 199.8 |
2k⁃PPG⁃OH | 2000 | 206.3 | 200.9 |
4k⁃PPG⁃OH | 4000 | 206.3 | 201.7 |
1k⁃PPG⁃C=C | 1080 | — | 184.3 |
2k⁃PPG⁃C=C | 2080 | 195.9 | 191.8 |
4k⁃PPG⁃C=C | 4080 | 199.8 | 195.4 |
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