FTIR investigation of molecular mobility in glassy epoxy-amine oligomers with azo-chromophores

16th International Youth Scientific School 'Actual Problems of Magnetic Resonance and its Applications'

Nefedyeva, K.L.^1 ; Fishman, A.I.^1 ; Balakina, M Yu^2 ; Vakhonina, T.A.^2

Kazan (Volga Region) Federal University, 420008 Kazan, Russia^1

A.E. Arbuzov Institute of Organic and Physical Chemistry KSC RAS, 420088 Kazan, Russia^2

关键词: 1 ,2-dichloroethanes;    Activation volume;    Conformational transitions;    FT-IR investigation;    Molecular mobility;    Process temperature;    Secondary relaxations;    Temperature range;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/478/1/012023/pdf
DOI  :  10.1088/1742-6596/478/1/012023

来源: IOP

【 摘 要 】

Molecular mobility in glassy epoxy-amine oligomer with covalently attached 4-amino-4'-nitroazobenzene NLO chromophore fragments has been studied by conformational probes method. The conformational transitions in the probes (1,2-dichloroethane and chlorocyclohexane) embedded in the oligomer have been studied in the temperature range from -160°C to +20°C. The freezing of conformational transitions has been observed by FTIR at temperature near Tf-90°C. This value is correlated with the secondary relaxation transition temperature in the oligomer. The comparison of the activation volumes of the mobile groups in the probes with volumes of mobile groups in the oligomer allows us to conclude that there is the freezing of benzene rings mobility near ß-process temperature.