An attempt to mechanistically explain the viscoelastic behavior of transparent epoxy/starch-modified ZnO nanocomposite coatings
PBN-AR
Instytucja
Wydział Chemiczny (Politechnika Gdańska)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
PROGRESS IN ORGANIC COATINGS (40pkt w roku publikacji)
ISSN
0300-9440
EISSN
Wydawca
DOI
URL
Rok publikacji
2018
Numer zeszytu
Strony od-do
171-182
Numer tomu
119
Identyfikator DOI
Liczba arkuszy
Autorzy
(liczba autorów: 7)
Pozostali autorzy
+ 6
Autorzy przekładu
(liczba autorów przekładu: 0)
Słowa kluczowe
EPOXY
NANOCOMPOSITE COATING
STARCH
VISCOELASTIC BEHAVIOR
ZINC OXIDE
Streszczenia
Język
Treść
The effects of bare and starch-modified ZnO (ZnO-St) nanoparticles on viscoelastic and mechanical properties are studied by dynamic mechanical and tensile analyses. Transparent epoxy-based nanocomposite films are prepared by incorporating bare or starch-modified ZnO particles into the epoxy matrix. The results demonstrated that ZnO particles hindered the curing reactions and hence the final properties of the cured epoxy. As a result, glass-transition temperature (Tg) and crosslinking density demoted. However, starch as a surface modifier compensated for the undesired effects of ZnO in a way that by enhancing the curing reactions through autocatalytic mechanism, Tg and crosslinking density increased. The storage moduli for epoxy, epoxy/ZnO and epoxy/ZnO-St are accordingly as 13.84, 3.95 and 19.54 MPa. Therefore, the molecular weight between the entanglements is calculated as 0.2878, 1.0089 and 0.2039 in the same order. Moreover, considering the peaks of the tanδ diagrams, Tgs for epoxy, epoxy/ZnO and epoxy/ZnO-St are obtained as 95.95, 100.16 and 101.24 °C, respectively. Comparing epoxy/ZnO-St nanocomposite to epoxy, it can be inferred that the network becomes tougher in the elastic region and then becomes softer passing this region. Mechanistic sketches of epoxy network formation in the presence of bare and surface-treated nanoparticles are discussed.
Inne
System-identifier
144798
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