Microscopic Observation of the Anisotropy of the Johari-Goldstein-ß Process in Cross-Linked Polybutadiene on Stretching by Time-Domain Interferometry.
ACS Macro Lett
; 13(7): 847-852, 2024 Jul 16.
Article
in En
| MEDLINE
| ID: mdl-38916259
ABSTRACT
The strain dependence of the Johari-Goldstein (JG)-ß relaxation time, as well as the directional dependence, was systematically investigated for stretched cross-linked polybutadiene using time-domain interferometry. We found that the strain dependence of the JG-ß relaxation time is directionally dependent, contrary to expectation the relaxation time of the JG-ß motion, whose displacement is perpendicular to the stretching direction, decreases with stretching, whereas the relaxation time of the parallel JG-ß motion changes little. This result is distinct from the previously reported strain dependence of the α relaxation time, where the relaxation time increases isotropically with stretching. Thus, the difference in the strain dependence of the relaxation time between the α and JG-ß processes suggests a microscopic origin and requires the modification of the conventional dynamic picture for stretched polymers.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
ACS Macro Lett
/
ACS macro let
/
ACS macro letters
Year:
2024
Document type:
Article
Affiliation country:
Japón
Country of publication:
Estados Unidos