Crystallization and molecular dynamics of ethylene-vinyl acetate copolymer/butyl rubber blends

Abstract

In this article, butyl rubber (IIR) was blended with ethylene-vinyl acetate copolymer (EVA) through a molten method. The crystal structure, morphology, crystallization and segmental dynamics were characterized.The crystal structure test indicated that IIR had no influence on the crystal form of EVA. Furthermore, the morphology showed that the blends changed from sea-island to a co-continuous structure. Moreover, the non-isothermal crystallization kinetics given by Mo's model showed that the rate of crystallization became fast as the content of EVA increased. In addition, the segmental dynamics characterization illustrated that EVA suppressed the molecular motions of IIR to a different degree. Longer units were more influenced than shorter units. It was also found that both crystallization and molecular dynamics had a close relationship with the morphology.

Improving Thermo-Oxidative Stability of Nitrile Rubber Composites by Functional Graphene Oxide

“…In addition, the area of tan δ peak showed that the area of NBR/GO–PPD was decreased compared to that of NBR ( Figure 9 b). Based on the above result, we could make a conclusion that GO–PPD hybrid particles have a positive interaction with the rubber matrix [ 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ].…”

Reinforcement of the mechanical properties in nitrile rubber by adding graphene oxide/silicon dioxide hybrid nanoparticles

“…In agreement with mechanical properties showed before (see Figure ), the storage modulus ( G ′) also increases with the content of GO/SiO 2 hybrid particles, see Figure (a). G ′ (at glasses state for plastics use and high elastic state for rubber use) has always been utilized to estimate the elasticity of polymer materials . Herein we used latter one, so‐called rubber elastics.…”

“…T g in this study has been determined by the maximum value of tan δ, and the values obtained can be seen in Table . This procedure was chosen because it can better represent the segmental dynamics of rubber than other methods (like the beginning point of G ′ dropping) . Compared with neat NBR, which T g value was −19 °C, GO/SiO 2 /NBR nanocomposites showed higher T g values (from −16.2 to 11.5 °C).…”

A review of the slow relaxation processes in the glass–rubber transition region of amorphous polymers

“…This phenomenon was also found in many polymer blends, such as PS/ CIIR, [83] CIIR/PMAc [84] and IIR/EVA. [85] The confinement effect has a larger influence on slower processes, which is shown by the decrease in the maximum of tand. The data of the PS/CIIR blend [85] showed that the slower processes were almost suppressed when the PS content was 90 wt%.…”

“…[85] The confinement effect has a larger influence on slower processes, which is shown by the decrease in the maximum of tand. The data of the PS/CIIR blend [85] showed that the slower processes were almost suppressed when the PS content was 90 wt%. The dynamics in copolymers are as interesting as in blends, [86,87] but are rarely studied.…”