Degradation and Stabilization of Polymers

Organic Binder Burnout in Alumina Processing

“…It could be observed that the binder mass loss took place along more than one step, and modifications occurred both in the beginning temperature and in the first derivative. The amount of mass loss was 1.26% of the total mass, which is in accordance to the amount of binder previously added to the powder [4]. Comparing the TGA results from Figures 2 and 3, a reduction in the beginning temperature of the binder mass loss can be observed, as shown in the Table 1.…”

Enhanced bonded aircraft repair using nano-modified adhesives

“…As has been demonstrated for epoxy reinforced with silane coated and uncoated silicate glass microspheres (bulk systems) at various volume fractions, water uptake saturation in saturated NaCl and MgCl 2 aqueous solutions depended on various parameters, such as the reinforcement volume fraction, the activity of water and the thickness of the bulk material [37,39]. Additionally, deposition of unstable polymer oxidation products was possible [45].…”

Kinetic Study of the Thermal and Thermo-Oxidative Degradations of Polystyrene Reinforced with Multiple-Cages POSS

“…The chemical changes and/or degradation induced by processing may have a determining effect on the lifetime of the polymer in subsequent use. Polymers are typical organic molecules whose physical and mechanical properties depend on their long chains, rather than on special properties of the atoms and bonds composing these chains [ 3 ]. In particular, for thermoplastic polymers, this means that molecular rearrangements can start before the expected lifetime because they are typically more sensitive to both temperature and time than other materials.…”

“…Their properties may change with time or with little temperature variations, even without any chemical reaction; thus, during both usage and storage, the polymers are subjected to a wide range of degradative influences, both physical and chemical [ 4 , 5 , 6 ]. Polyolefins are especially vulnerable to oxidation, becoming weakened and useless in a very short time; thus, most are unusable without additives that inhibit degradation chemistry [ 3 ]. It is therefore clear that polymer instability caused by weathering may be reduced by the different reactions contributing to this instability, rearrangements of the chemical structure, formation of oxidation products, crosslinking, and chain scission [ 7 ].…”