Use of DMA-material pocket to determine the glass transition temperature of nitrocellulose blends in film form

A study on the viscoelastic behaviors of tire cords using dynamic mechanical analysis

“…1,2 In these mechanical rubber goods, fibers are incorporated into the rubber matrix serving as a skeleton component to stand the large scale of load and maintain its shape, which have a great influence on the physical and mechanical properties of the entire composites. 1,3,4 Tire might be one of the most predominating fiber-reinforced rubber composites. There are five major kinds of synthetic organic fibers available as the carcass tire cord material: regenerated cellulose (Rayon), polyester (polyethylene terephthalate (PET)), polyethylene naphthalate (PEN), nylon (PA6, PA66), and aramid.…”

“…Macromolecular chains lose their tough structure, and thermophysical properties of polymer such as enthalpy, heat capacity, volume, and modulus behave differently from glassy state to rubbery state. 3,[6][7][8] Dynamic mechanical and major characteristic properties of these five common carcass tire cords are depicted in Figure 1 and Table 1, respectively. During glass transition, the complex modulus of thermoplastic tire cords (nylon 6, PET, PEN) decreases rapidly and energy dissipation due to internal friction increases, thus making Tan δ reach its peak value.…”

“…9 There are several techniques available to determine T g of a polymer, such as differential scanning calorimetry (DSC), thermomechanical analysis (TMA), and dynamic mechanical analysis (DMA). 2,3 DSC is a conventional way to characterize T g by identifying the variance of calorific capacity, while DMA detects the changes in the modulus and energy dissipation during glass transition. During transition from glassy to rubbery states, there is an obvious decrease in the magnitudes of moduli, and hence DMA is more sensitive and capable of determining T g than DSC.…”

“…During transition from glassy to rubbery states, there is an obvious decrease in the magnitudes of moduli, and hence DMA is more sensitive and capable of determining T g than DSC. 3,7 Given the different techniques employed, the discrepancy of T g obtained from DSC and DMA can be up to 25°C. 3,11 Even within the DMA technique, T g can be derived from the storage modulus curve, the peak of loss modulus curve, and the peak of Tan δ curve.…”

“…3,7 Given the different techniques employed, the discrepancy of T g obtained from DSC and DMA can be up to 25°C. 3,11 Even within the DMA technique, T g can be derived from the storage modulus curve, the peak of loss modulus curve, and the peak of Tan δ curve. 3,[6][7][8][9] According to ASTM D4605, T g is advised to be acquired from the peak of loss modulus; 8,12 however, the peak of Tan δ is most widely adopted as T g in several studies.…”