Kinetics and dynamics of the Curing System. High pressure Studies
PBN-AR
Instytucja
Centrum Nanobiomedyczne (Uniwersytet im. Adama Mickiewicza w Poznaniu)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
MACROMOLECULES
ISSN
0024-9297
EISSN
Wydawca
AMER CHEMICAL SOC
DOI
URL
Rok publikacji
2014
Numer zeszytu
13
Strony od-do
4288–4297
Numer tomu
47
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
en
Broadband dielectric spectroscopy; Fourier transform infrared spectroscopy; High Pressure Studies
Streszczenia
Język
en
Treść
Broadband dielectric and Fourier transform infrared spectroscopies were applied to study dynamics and kinetics upon polymerization of bisphenol A diglycidyl ether (DGEBA) and 2-ethylhexylamine under different thermodynamic conditions. We found out that polymerization constant rates as well as activation barriers determined from both methods are almost the same (within the experimental uncertainty). High pressure studies have enabled to calculate the activation volume which was found ΔV = −38 cm3/mol and −46 cm3/mol in the limit of low pressure for two independent isothermal experiments. This finding shows that the activation volume is not constant, but varies with thermodynamic conditions. As a result, polymerization reaction cannot be described with the use of only one given activation volume, as it is usually reported in literature. It should be also noted that ΔV increases with compression and tends to be positive above P = 430 and 370 MPa for the reaction carried out at T = 293 K and T = 313 K, respectively. This is strongly related to the diffusion mechanism that starts to control the polymerization reaction under higher compression. Finally, we have also verified the validity of the time–temperature–pressure superposition (TTP) rule with respect to the structural relaxation process that seems to be crucial point in the context of the proposed protocol of the data analysis.
Cechy publikacji
discipline:Fizyka
discipline:Physics
Original article
Original article presents the results of original research or experiment.
Oryginalny artykuł naukowy
Oryginalny artykuł naukowy przedstawia rezultaty oryginalnych badań naukowych lub eksperymentu.
Inne
System-identifier
PBN-R:875928
CrossrefMetadata from Crossref logo
Cytowania
Liczba prac cytujących tę pracę
Brak danych
Referencje
Liczba prac cytowanych przez tę pracę
Brak danych