Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Characterization by Dynamic Mechanical Thermal Analysis

It has been found that the interaction of intercalated and/or exfoliated nanoparticles may restrict the mobility of the matrix polymer chains, which lead to an increase of Tg values, as observed in nanocomposites of polyamide-12-layered silicates [102], nitrile rubber-organophilic montmorillonite [103], natural rubber-montmorillonite [104], and EVA-day [105]. A slight increase with the organosurface treatment in Tg values was noticed in poly(vinyl chloride)-clay [106,107], poly(vinyl chloride)-CNTs [108], polyurethane-montmorillonite [109-111], LLDPE-layered tetrasilisic fluoromica [112], PP-montmorillonite [113-115], PP-sUica [116], and styrene-butadiene rubber [117]. [Pg.131]

The increased interaction between polymer and nanopartides can also be extracted from the enhanced values of the storage modulus, as observed in PP-carbon nanofibers (Table 5.3) [118], PS-montmorillonite [119], PLA-montmorillon-ite [120,121], PA6-montmorillonite [122], LDPE-ethylene-octene-montmorillonite [123], HDPE-montmorillonite [124], PP-montmorillonite [125], and PBT-montmo-rillonite [126]. [Pg.132]

Nevertheless, in other cases, a plastidzing effect of the nanopartides has been reported, which leads to a decrease in both the values of Tg and the storage modulus. Artzi et al. [127] reported in EVOH-montmorillonite nanocomposites a decrease of Tg values from 5 wt% of day. The same authors predict two opposing effects on the transition the confined chain mobility owing to interaction buildup, and an increased mobility due to reduction in the crystallinity degree as a consequence of polymer-clay interaction [128]. The addition of a compatibilizer, either maleic anhydride-grafted ethylene-vinyl acetate (EVA-g-MA) or maleic anhydride-grafted linear low-density polyethylene (LLDPE-g-MA), led to a decrease in the Tg values [129]. This 5wt% day content maximum is also described by McAdam et cd. in PA6-day nanocomposites [130]. [Pg.132]


See other pages where Characterization by Dynamic Mechanical Thermal Analysis is mentioned: [Pg.131]    [Pg.131]   


SEARCH



Dynamic Mechanical Characterization

Dynamic analysis

Dynamic characterization

Dynamic mechanical thermal

Dynamic mechanical thermal analysi

Dynamic mechanical thermal analysis

Dynamic mechanisms

Dynamic thermal analysis

Dynamical mechanical

Dynamical mechanical thermal analysis

Mechanical analysis

Mechanism thermal

THERMAL MECHANICAL

Thermal analysis, characterization

Thermal characterization

Thermal mechanical analysis

© 2024 chempedia.info