Characterization of Lithium Stearate: Processing Aid for Filled Elastomers

Thermal and chemical stabilization of ethylene/vinyl acetate/vinyl alcohol (EVA‐OH) terpolymers under nitroplasticizer environments

“…The first peak (347.3 C) is associated with the decomposition of VAc group along the backbone to form acetic acid, while the second peak (461.4 C) is due to the thermal decomposition of all hydrocarbon functional groups in the polymer. 11,26 When EVA-OH is immersed inside the liquid NP at RT, NP molecules slowly diffuse into the EVA-OH matrix, but do not noticeably change these two DT EVA-OH s of the polymer. On the other hand, as discussed below, the 1st derivative of the weight loss of NP against temperature (DT NP ) in the range of 30-270 C changes appreciably.…”

“…Since the pristine EVA-OH consists of 56% ethylene, 41% VAc, and <2.0% VA, its thermal properties is dominated by the first two of these components. The glass transition temperature (T g ) of polyethylene (PE) ranges from 2120 to 225 C (depending on its density) while the T g of polyvinylacetate (PVAc) is 30 C. 26,29 Here, the T g of pristine EVA-OH is 235 C. Typically, EVA-OH softens as the temperature rises above room temperature, and starts to melt at 54.6 C, which is much lower than the melting point (T m ) of PE (between 95 and 140 C). This T m may be due to the melting of VAc segments in the EVA-OH with some influence of its T g .…”