National Synchrotron Radiation Laboratory, Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei 230026, China
wc003@ustc.edu.cn
收稿:2023-04-18,
修回:2023-5-15,
录用:2023-6-5,
网络首发:2023-08-07,
纸质出版:2024-01-01
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Lv, J.; Chen, X.; Wu, Z. S.; Li, Y. H.; Chen, W. Chain dynamics heterogeneity in plasticized poly(vinyl butyral) (PVB) as elucidated by solid-state NMR. Chinese J. Polym. Sci. 2024, 42, 113–124
Jing Lv, Xu Chen, Zi-Shuo Wu, et al. Chain Dynamics Heterogeneity in Plasticized Poly(vinyl butyral) (PVB) as Elucidated by Solid-State NMR[J]. Chinese Journal of Polymer Science, 2024, 42(1): 113-124.
Lv, J.; Chen, X.; Wu, Z. S.; Li, Y. H.; Chen, W. Chain dynamics heterogeneity in plasticized poly(vinyl butyral) (PVB) as elucidated by solid-state NMR. Chinese J. Polym. Sci. 2024, 42, 113–124 DOI: 10.1007/s10118-023-3017-0.
Jing Lv, Xu Chen, Zi-Shuo Wu, et al. Chain Dynamics Heterogeneity in Plasticized Poly(vinyl butyral) (PVB) as Elucidated by Solid-State NMR[J]. Chinese Journal of Polymer Science, 2024, 42(1): 113-124. DOI: 10.1007/s10118-023-3017-0.
The combination of various SSNMR techniques quantified the multiscale dynamics heterogeneity of the plasticized Poly(vinyl butyral) (PVB) system: (1) the mesoscale dynamics heterogeneity where the plasticizer rich and poor domains coexist; (2) the chain dynamics heterogeneity of VB units with different stereogeometries; (3) the local mobility gradient for VB unit.
The chain dynamics heterogeneity of the poly(vinyl butyral) (PVB) plasticized by triethylene glycol bis(2-ethylhexanoate) (TEG-EH) was investigated by various solid-state NMR techniques. The plasticized PVB shows two domains in distinct molecular dynamics differences
namely
rigid and soft domains
where the latter is the plasticizer-rich domain. The time domain low field NMR was first used to investigate the dynamics heterogeneity of the plasticized PVB
and the results show the decreasing activated energy of components in the soft domain of plasticized PVB (
E
a
=20.2 kJ/mol) as compared with that of the pristine one (
E
a
=24.3 kJ/mol). Detailed dynamics heterogeneity was obtained by high-field NMR with site-specific features. The quadrupole-echo
2
H-NMR was adopted to elucidate the dynamics heterogeneity of the vinyl alcohol (VA) units
where only the hydroxyl group of VA is deuterated. The
1
H-
13
C WISE NMR spectra show that there is not much difference in the mobility of the VB unit in PVB with and without plasticizer
whereas the glass transition temperature differed by approximately 53 °C. This is further supported by Torchia's
T
1
relaxation measurements. The origin of such an unusual phenomenon is attributed to the critical role of the remaining VA (~22%) in the soft domain
where the VA units locally aggregate through hydrogen bonding. Also
the existence of a mobility gradient in the VB unit has been demonstrated. Moreover
the mobility difference for VB with different stereo-geometry (
meso
or
racemic
conformation) is observed for the first time. This indicates the importance of modulating the ratio of
meso
over
racemic
VB for controlling the macroscopic performance of PVB.
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