Abstract
This article presents the studies on the thermal and viscoelastic properties of novel epoxy-dicyclopentadiene-terminated polyesters-styrene copolymers. The novel materials were prepared during a three step process including the addition reaction of maleic acid to norbonenyl double bond of dicyclopentadiene; polycondensation of acidic ester of dicyclopentadiene, cyclohex-4-ene-dicarboxylic anhydride, maleic anhydride, and suitable glycol: ethylene, diethylene, or triethylene glycol; and the epoxidation process of prepared polyesters. It allowed obtaining novel epoxy-dicyclopentadiene-terminated polyesters which were successfully used as a component of different styrene content (10–80 mass%) copolymers. The influence of the structures of polyester and styrene content on the cross-linking density (v e), tgδ max, tgδ max height, storage modulus (E′ 20 °C), FWHM values as well as the thermal stability of copolymers was evaluated by TG, DSC, and DMA analyses and discussed.
Highlights
Characterization of styrene copolymersThe calorimetric measurements were carried out in the Netzsch DSC 204 calorimeter (Germany)
This paper presents the studies on the thermal and viscoelastic properties of novel epoxy-dicyclopentadiene-terminated polyesters-styrene copolymers
The results show that the properties of copolymers strongly depended on the structure of polyesters and styrene content
Summary
The calorimetric measurements were carried out in the Netzsch DSC 204 calorimeter (Germany). The dynamic scans were performed at a heating rate of 10 °C min-1 under nitrogen atmosphere (40 mL min-1). The copolymers were heated from room temperature to 500 °C. The conditions were as follows: heating rate 10 °C min-1, a helium atmosphere (40 mL/min), the temperature range of 30–800 °C, and sample mass *10 mg. The rectangular profiles of the samples 10-mm wide and 4-mm thick were applied The measurements were made from room temperature to the temperatures at which the sample was too soft to be tested at a constant heating rate of 4 °C min-1 and an oscillation frequency of 10 Hz. The storage modulus (E020 °C), glass transition temperature (a-relaxation) identified as a maximum of the tgd (tgdmax), tgdmax height, cross-linking density (ve), and FWHM values were determined.
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