Evaluation of the area under linear loss modulus‐temperature curves

Abstract

SYNOPSISThe area under the linear loss modulus-temperature curves, LA, has been shown to be related to the chemical composition of the material. In addition, it can be significantly affected by morphology in multicomponent polymer systems. To characterize LA quantitatively, base-line corrections for instrumental contributions to LA were evaluated by several different methods and the results compared. In some instances, the calculation method affects only the LA magnitude, while general trends are unchanged whereas in others, qualitative differences also become important. Not all of the methods described can be utilized universally. However, a straight-line-type of base line, similar to that which is used in infrared spectroscopy and differential scanning calorimetry, provides a widely applicable means of quantifying the loss area.

Multicomponent latex IPN materials: 2. Damping and mechanical behavior

“…Because it was already known that LA could be increased by using heat. This is similar to the absorption of infrared electromagnetic radiation to increase molecular filled IPNs and composites, 32 Fay et al 25,26,33,34 investigated the effect of morphology on IPNs. Values motion, where the area under the peak is quantitatively proportional to the concentration of the of LA could be increased or decreased by up to 30% just by varying the morphology.…”

“…Because it has been found that methods of tan EЉ, and tan d. The present work was carried out using a Rheometrics RDA2 at 1 Hz. This instrud Å 0.03 and straight line yield approximately equivalent areas, in this work, LA and TA values ment yields G, GЉ, and tan d. It was found that the value for polystyrene obtained by the current for all the latex particles were evaluated using a straight-line baseline method, as shown in Figure work could be approximated by dividing Chang and Fay's data for polystyrene, 33 LA Å 9.5 GPa-2. The values of Chang 30 and Fay 33 were used to create Table II for the purposes of the present K (based on EЉ), by three using the following equation: work.…”

“…The theoretical LA values were calculated from the LA values obtained by the group contribution calculate the LA values 33 : tan d Å 0.03, straight line, height 1 width, integral area, and constant analysis method. 30 Most of the earlier work was done with a Rheovibron at 110 Hz, yielding E, GЉ.…”

Investigation on damping behavior and morphology of polyurethane/polymethacrylates and polyacrylates interpenetrating polymer networks

“…For the E"-T curves, the peaks of all samples are symmetrical. Fay et al 7 and Chang et al 13 suggested that the integral value of the loss modulus versus temperature curve, which was called loss area, displays the properties of materials which were related to its structure. Every group within the polymer contributes to the loss, respectively.…”

Synthesis and Characterization of Silicone epoxy resin /poly (methyl methacrylate) Interpenetrating Polymer Networks

“…The figures shows that broader glass transition peaks as shown by the Tan δ versus temperature and the linear loss modulus, E'' curves. Fay 18 etal and Chang 19 etal suggested that the integral value of the loss modulus versus temperature curve and wshich was called loss area is displays the properties of materials which are related to its structure. The main chain and pendent chain linked directly with the main chain make chief contributions to the damping property in the glass transition temperature region.…”