TGA/DTG/DSC investigation of thermal ageing effects on polyamide–imide enamel

Abstract

Thermoanalytical investigations TGA/DTG/ DSC of polyamide-imide enamel after thermal ageing have been presented. The lifetimes at 260, 270, 280, 290, 300°C were determined. The thermograms of the enamels after attaining of their lifetimes much depend on the ageing temperature. The temperatures of 5% loss of mass that much increase after thermal ageing appear the most sensitive indicator of ageing rate. The residue of mass at 800°C increases after ageing, even to 27%, due to diffusion of copper ions from the conductor into enamel during annealing. The copper contents in aged coatings could be also an indicator of ageing rate.

Importance of Mullins effect in commercial silicone elastomer formulations for soft robotics

“…Thermogravimetric analysis of cured silicone formulations was performed from room temperature to 900°C under nitrogen atmosphere to inspect general thermal decomposition behavior of the cured silicone elastomer formulations and obtain information on the solid residue after thermal treatment. The onset of thermal degradation is commonly predicted using the temperature at which 5% weight loss is recorded 45–47 . Onset temperatures of degradation, residual weights at 900°C, and amounts of filler in each formulation are presented in Table 2.…”

Failure analysis and durability of preinsulating district heat pipes

“…Figure A displays the TGA curves of fresh PUR near to the steel surface heated at 2, 5, 10, and 20 K/min. As seen in the TPU analysis, higher heating rates shift the onset of decomposition to higher temperatures because of slower reaction rates . In Figure B, and following the OFW kinetic decomposition method in Equation , the logarithm of heating rates vs reciprocal absolute temperatures at 95, 90, 80, and 70% of residual weight.…”

“…The TGA curves of aged specimens shifted to lower temperatures indicating that the nonisothermal behavior of PUR changed because of the isothermal artificial aging. This temperature shifting may be attributed to the scission of the polymer chains during thermal pre‐aging, which ended up with the PUR degradation at low temperature,…”

Chemical grafting of cholesterol on monomer and PDMMLA polymers, a step towards the development of new polymers for biomedical applications

“…DSC technique provides information about the thermal properties of a polymer, mainly the glass transition temperature T g which shows structural changes in the backbone and melting temperature T m . 13,14 Fig. 3 and 4 show the TGA and DSC thermograms of the graed polymers respectively.…”