Nylon 6.6 accelerated aging studies: thermal–oxidative degradation and its interaction with hydrolysis

Bromo-butyl Rubber for Face Piece of a Respiratory Mask

“…Since the tensile property tends to decrease in the samples exposed to this extreme temperature, indicating the weakening of the bonds, and hence swelling occurred. Similar observations have been reported for swelling study in the literature [10].…”

“…All the components have to be intact without any degradation during the shelf life period. The reported degradation of polymer components mainly occur due to thermal [5][6][7] oxidants such as ozone [8], ultraviolet radiation [6,8], photo oxidation [6,9], thermal oxidation and hydrolysis leading to chain scission or cross linking [10,7], swelling and hydrolysis [11]. A number of techniques used are (i) FTIR to investigate scission in the backbone [12] (ii) Change of tensile properties [13][14] (iii) Thermo-gravimetric and differential scanning calorimetry to evaluate thermal stability and glass transition (T g ) behaviour.…”

Identification of volatile butyl rubber thermal-oxidative degradation products by cryofocusing gas chromatography/mass spectrometry (cryo-GC/MS).

“…In the future, the headspace above these materials will be sampled; the degradation species will be characterized; and comparisons will be drawn to samples presented in this manuscript. In addition, these results and those for other polymers can be compared to compounds of interest to the DOE complex that have already been studied by this group: polyethylene [18,19], polypropylene [20][21][22], nylon 6.6 [23][24][25][26], and poly(ethylene-co-vinyl acetate). This information may identify common degradation products and therefore degradation pathways amongst WR materials.…”

Characterization of Volatile Nylon 6.6 Thermal-Oxidative Degradation Products by Selective Isotopic Labeling and Cryo-GC/MS

“…Structures of nylon 6.6 monomers and polymers used in these studies studies that focused on changes in tensile strength (i.e., physical properties) [1,2]. The aging temperature was chosen to achieve reasonable levels of physical property degradation in an acceptable amount of time.…”

“…Certain high-reliability applications require that nylon materials are either stored or used for durations up to several decades [1,2]. Therefore, it is critical to enhance the current knowledge base of nylon aging, in particular nylon aged under thermal-oxidative conditions, as a means to correlate degradation product formation to changes in physical properties.…”